Purple Fountain Grass Planted with Coral Bells
Purple fountain grass planted with coral bells creates a breathtaking garden combination that offers dramatic texture, vibrant color, and multi-season interest. This dynamic duo thrives in similar conditions, making them perfect companions for borders, containers, and landscape focal points.
There is something magical about finding two plants that just seem made for each other. When you see purple fountain grass planted with coral bells in a well-designed garden, you immediately understand why this combination has become a favorite among landscape designers and home gardeners alike. The way the grass catches the light and moves with the slightest breeze, while the coral bells hold their ground with ruffled, colorful foliage, creates a scene that feels both wild and intentional.
I first discovered this pairing in a neighbor’s front yard about five years ago. It was late August, and the purple fountain grass was in full plume, its fuzzy bottlebrush flowers glowing in the evening light. Beneath it, a carpet of ‘Palace Purple’ coral bells formed a living mulch, their deep burgundy leaves creating a seamless color bridge. I stood there for ten minutes just watching. The grass swayed. The coral bells stayed put. Together, they told a complete story. That moment changed how I think about plant combinations forever.
Key Takeaways
- Perfect Plant Partners: Purple fountain grass and coral bells share similar sun, soil, and water needs, making them low-maintenance companions.
- Year-Round Visual Interest: The grass provides summer-through-fall drama while coral bells offer evergreen foliage in winter.
- Contrasting Textures Create Drama: Fine, arching grass blades beautifully offset the mounded, ruffled coral bell leaves.
- Color Harmony Opportunities: Choose coral bell varieties that echo or contrast the grass’s purple tones for custom looks.
- Container-Friendly Combination: Both plants thrive in pots, allowing placement on patios, decks, and entryways.
- Wildlife Benefits: This pairing attracts pollinators and provides shelter for beneficial insects.
- Easy Maintenance Routine: Simple seasonal care keeps this combination looking fresh with minimal effort.
Quick Answers to Common Questions
Can purple fountain grass and coral bells grow in full sun?
Yes, both plants thrive in full sun, though coral bells appreciate afternoon shade in the hottest climates. Purple fountain grass loves heat and full sun exposure for best plume production.
Is purple fountain grass perennial in cold climates?
No, purple fountain grass is hardy only in USDA zones 9-11. In zones 8 and below, it is grown as an annual or overwintered in containers in a protected location.
How often should I divide coral bells?
Divide coral bells every 3-4 years in early spring when the center of the clump becomes woody and less vigorous. This rejuvenates the plant and provides free divisions.
Do deer eat purple fountain grass or coral bells?
Both plants are generally deer-resistant. Deer may occasionally sample coral bells in early spring when food is scarce, but they rarely cause significant damage to either plant.
Can I grow this combination in containers?
Absolutely. Use a large container (18+ inches) with good drainage. Plant one grass in the center surrounded by 3-5 coral bells. Water and fertilize more frequently than in-ground plantings.
📑 Table of Contents
- Why This Combination Works So Well
- Choosing the Right Coral Bells for Your Grass
- Design Strategies for Maximum Impact
- Planting and Establishment
- Ongoing Care and Maintenance
- Seasonal Highlights and Year-Round Interest
- Creative Variations and Companion Plants
- Common Mistakes and How to Avoid Them
- Conclusion
Why This Combination Works So Well
Shared Growing Requirements
One of the biggest reasons purple fountain grass planted with coral bells succeeds is that both plants want the same things. They both prefer full sun to part shade. They both need well-draining soil. They both tolerate drought once established. When plants share cultural requirements, you eliminate the constant compromise of trying to keep one happy without drowning or starving the other.
Purple fountain grass (Pennisetum setaceum ‘Rubrum’) thrives in USDA zones 9 through 11 as a perennial, though gardeners in cooler zones grow it as an annual. Coral bells (Heuchera species and hybrids) are hardy in zones 4 through 9. This means in zones 7 through 9, you get a true perennial combination that returns year after year. In colder zones, you simply replant the grass each spring while the coral bells persist.
Complementary Growth Habits
The architecture of these two plants could not be more different, and that is exactly why they work. Purple fountain grass grows in a graceful fountain shape, reaching three to four feet tall and wide at maturity. Its narrow blades arch outward and downward, creating movement and a sense of softness. The flower plumes rise above the foliage in summer, adding another foot of height and a completely different texture.
Coral bells, by contrast, form low mounds typically twelve to eighteen inches tall and wide. Their leaves emerge from a central crown in a rosette pattern, creating a dense, ground-covering effect. The leaves are rounded with ruffled or scalloped edges, offering a completely different geometry than the linear grass blades. When you plant coral bells around the base of purple fountain grass, they hide the grass’s sometimes bare lower stems while creating a full, lush look from ground level up.
Seasonal Performance
This combination shines because it offers something interesting in every season. Spring brings fresh coral bell foliage in incredible colors, from lime green to deep purple, silver to caramel, often with contrasting veins. The grass emerges a bit later but quickly catches up. Summer is the glory season for purple fountain grass, when those iconic purple-pink plumes appear and persist for months. Coral bells send up delicate flower spikes in late spring to early summer, adding airy blooms that attract hummingbirds.
Fall brings intensified color. The grass plumes fade to a warm wheat color that catches autumn light beautifully. Many coral bell varieties develop richer, deeper tones as temperatures drop. Winter reveals the combination’s hidden strength. In mild climates, the grass remains evergreen. In colder areas, it provides structural interest with its dried plumes and foliage. Coral bells are largely evergreen, holding their colorful leaves through winter snow, providing rare cold-season color when the garden needs it most.
Choosing the Right Coral Bells for Your Grass
Color Theory in the Garden
The color of your coral bells dramatically changes the mood of the purple fountain grass planted with coral bells combination. Because the grass has strong purple-red tones in its foliage and plumes, you have several strategic options. You can echo those tones with similarly colored coral bells for a monochromatic, sophisticated look. You can contrast with complementary colors for high drama. Or you can bridge with neutral tones for a more subtle effect.
Visual guide about Purple Fountain Grass Planted with Coral Bells
Image source: gardenbeast.com
Purple and Burgundy Varieties
For a rich, jewel-toned planting, choose coral bells in deep purple or burgundy. ‘Palace Purple’ is the classic choice, with large, maple-shaped leaves in a glossy bronze-purple that perfectly mirrors the grass. ‘Obsidian’ offers nearly black leaves with a high-gloss finish that looks stunning against the grass’s softer texture. ‘Black Pearl’ forms a tight mound of intensely dark, ruffled leaves. These dark varieties create a seamless color flow that makes the planting feel like a single, cohesive design element rather than two separate plants.
Chartreuse and Lime Green Varieties
If you want to wake up the combination, go for chartreuse or lime green coral bells. ‘Lime Rickey’ has ruffled, electric green leaves that practically glow in shade. ‘Electra’ offers lime green leaves with dramatic dark veins. ‘Citronelle’ maintains a clean, bright yellow-green all season. The contrast between hot purple grass and cool lime coral bells creates vibration in the garden. Your eye cannot help but bounce between them. This is the combination for gardeners who want their plantings to be noticed from across the yard.
Caramel, Peach, and Amber Varieties
For a warmer, more autumnal feel, look at the caramel and peach coral bells. ‘Caramel’ lives up to its name with leaves that shift from apricot to amber to soft gold depending on light and temperature. ‘Georgia Peach’ has large, peachy-orange leaves with a silver overlay. ‘Ginger Ale’ offers a more subdued ginger-tan tone. These colors pick up the warm undertones in the grass plumes as they age, creating a harmonious transition through the seasons. They feel cozy and inviting, perfect for gardens meant to be lived in and enjoyed up close.
Silver and Pewter Varieties
Silver coral bells bring sophistication and light to the combination. ‘Silver Scrolls’ has pewter leaves with dark purple veins and undersides. ‘Plum Pudding’ offers plum-purple leaves with a heavy silver overlay. ‘Stainless Steel’ lives up to its name with metallic silver foliage. These varieties reflect light beautifully, brightening the base of the grass and adding a modern, clean aesthetic. They work especially well in contemporary gardens or moon gardens designed for evening enjoyment.
Design Strategies for Maximum Impact
Border and Edge Plantings
One of the most effective ways to use purple fountain grass planted with coral bells is along pathways, driveways, or property lines. Plant the grass in a staggered row, spacing plants three feet apart. Then plant coral bells in a continuous drift along the front edge, spacing them fifteen to eighteen inches apart. The grass creates a soft, see-through screen that defines the space without blocking views. The coral bells provide a finished, polished edge that looks intentional year-round.
For a more natural look, avoid straight lines. Plant the grass in groups of three or five, offset from each other. Let the coral bells flow around and between them in irregular drifts. This mimics how plants grow in nature and creates a more relaxed, meadow-like feel. It also makes the planting more resilient. If one grass plant fails, the gap is less noticeable in an irregular grouping than in a formal row.
Container Combinations
Both plants thrive in containers, making this combination perfect for patios, decks, balconies, and entryways. Choose a large container at least eighteen inches wide and deep. Use a high-quality potting mix with good drainage. Plant one purple fountain grass in the center or slightly off-center. Surround it with three to five coral bells around the edges. The grass provides height and drama. The coral bells spill over the pot edges, softening the container’s hard lines.
Container plantings need more frequent watering than in-ground plantings. Check daily in hot weather. Fertilize monthly with a balanced liquid fertilizer during the growing season. In cold climates, move containers to a protected location like an unheated garage for winter. The coral bells will survive. The grass will not, but you can replace it each spring for a fresh start. Many gardeners enjoy this annual renewal as a chance to try new coral bell varieties or different grass cultivars.
Focal Point Plantings
Use this combination as a specimen planting in a prominent spot. A single large clump of purple fountain grass underplanted with a circle of coral bells creates a living sculpture. Place it where it will be backlit by morning or evening sun. The grass plumes will glow like stained glass. The coral bells will catch and reflect that light. This works beautifully in island beds, at the end of sight lines, or flanking a gate or arbor.
For even more impact, use uplighting. Low-voltage landscape lights placed at the base of the grass, aimed upward, transform the planting into a nighttime feature. The grass plumes catch the light beautifully. The coral bell foliage reflects it. You extend the garden’s enjoyment hours significantly with this simple addition.
Mass Plantings for Commercial or Large Properties
On a larger scale, purple fountain grass planted with coral bells creates stunning mass plantings. Space grass plants four feet apart in a grid pattern. Fill the entire area between them with coral bells planted eighteen inches apart. The result is a textural carpet with vertical accents that reads as a single design element from a distance but reveals intricate detail up close. This approach works well for corporate campuses, shopping centers, median strips, and large residential properties.
Maintenance is surprisingly manageable at scale. The dense coral bell planting suppresses weeds effectively. The grass requires only annual cutback in late winter. Irrigation can be handled with drip lines. The visual impact per maintenance hour is exceptionally high, making this combination a favorite of landscape architects working on commercial projects.
Planting and Establishment
Timing Your Planting
Spring is the ideal time to plant both components of this combination. The soil has warmed, frost danger has passed, and plants have a full growing season to establish before winter. In zones 9 and 10, you can also plant in early fall, giving roots time to establish before summer heat returns. Avoid planting in the heat of midsummer unless you can provide consistent irrigation and temporary shade.
If you are planting in spring, wait until nighttime temperatures are consistently above fifty degrees Fahrenheit. Purple fountain grass is a warm-season grass that sulks in cold soil. Coral bells are more tolerant but establish faster in warm soil. If you buy plants early, hold them in a protected location and harden them off gradually before planting.
Soil Preparation
Both plants demand good drainage. If your soil is heavy clay, amend it generously with compost, coarse sand, or fine gravel. Create a planting area at least twice as wide as the root ball for each plant. Work amendments into the top twelve inches of soil. For coral bells, which have shallow root systems, the top six inches are most critical.
Test your soil pH if possible. Coral bells prefer slightly acidic to neutral soil, around 6.0 to 7.0. Purple fountain grass is more adaptable but performs best in the same range. If your soil is strongly alkaline, incorporate elemental sulfur or acidifying organic matter like pine bark fines. If strongly acidic, add lime. Most garden soils fall in the acceptable range without amendment.
Planting Technique
Water both plants thoroughly in their nursery pots before planting. Dig holes the same depth as the root balls but two to three times as wide. For the grass, the crown should sit at soil level. For coral bells, the crown should sit slightly above soil level, about half an inch high. This prevents crown rot, a common issue with heucheras planted too deep.
Gently loosen circling roots. Place plants in holes. Backfill with native soil mixed with a handful of compost. Firm soil gently around roots. Water deeply to settle soil and eliminate air pockets. Apply two to three inches of mulch around plants, keeping it away from crowns. Shredded bark, pine straw, or compost all work well. Mulch conserves moisture, suppresses weeds, and moderates soil temperature.
Spacing Guidelines
For purple fountain grass planted with coral bells in a border, space grass plants three to four feet apart on center. Space coral bells fifteen to eighteen inches apart on center. Plant coral bells in a band twelve to eighteen inches wide along the front of the grass. In containers, one grass plant per eighteen-inch pot with three to five coral bells around the perimeter. For mass plantings, use a four-foot grid for grass and eighteen-inch spacing for coral bells throughout.
Ongoing Care and Maintenance
Watering
Water deeply and regularly during the first growing season to establish deep root systems. After establishment, both plants are notably drought-tolerant. Purple fountain grass develops deep roots that access moisture far below the surface. Coral bells have shallower roots but thick, somewhat succulent leaves that store water. In most climates, established plants need supplemental water only during extended dry periods.
Water at the base of plants, avoiding wetting foliage when possible. Wet foliage, especially on coral bells, can encourage fungal diseases. Drip irrigation or soaker hoses are ideal. If using overhead irrigation, water early in the day so foliage dries quickly. In containers, check soil moisture daily in hot weather. The limited soil volume dries much faster than garden soil.
Fertilizing
Neither plant is a heavy feeder. In good garden soil amended with compost at planting, additional fertilizer may be unnecessary. If growth seems slow or foliage color is pale, apply a balanced slow-release fertilizer in early spring. A 10-10-10 or similar formulation at half the recommended rate is plenty. Avoid high-nitrogen fertilizers, which promote lush foliage at the expense of flower plumes on the grass and can make coral bells more susceptible to disease.
For container plantings, nutrients leach out with frequent watering. Apply a slow-release fertilizer at planting time, then supplement with liquid fertilizer at quarter strength monthly during the growing season. Stop fertilizing in late summer to allow plants to harden off before winter.
Pruning and Cleanup
The main maintenance task for purple fountain grass is annual cutback. In late winter or very early spring, before new growth emerges, cut the entire plant back to six to twelve inches above ground. Use sharp hedge shears or a pruning saw for larger clumps. Wear gloves and long sleeves. The grass blades can be sharp and cause skin irritation. Remove all cut material. It makes excellent mulch or compost if chopped.
Coral bells need minimal pruning. Remove any winter-damaged leaves in early spring by gently pulling them away from the crown. Deadhead flower spikes after blooming if desired, though many gardeners leave them for the seed heads. Every three to four years, coral bells benefit from division. The center of the clump becomes woody and less vigorous. Dig the plant in spring, pull or cut apart into sections with healthy roots and crowns, and replant the vigorous outer sections.
Pest and Disease Management
This combination is remarkably trouble-free. Purple fountain grass has virtually no pest or disease issues in landscape settings. Coral bells can occasionally suffer from heuchera rust, a fungal disease that appears as orange pustules on leaf undersides. Good air circulation, proper spacing, and avoiding overhead watering prevent most issues. If rust appears, remove affected leaves and improve cultural conditions.
Vine weevils can attack coral bell roots, especially in containers. The adults notch leaf edges at night. The larvae feed on roots. Beneficial nematodes applied to soil in spring and fall provide effective biological control. Deer and rabbits generally avoid both plants, though they may sample coral bells in early spring when other food is scarce. Repellent sprays or temporary fencing protect new plantings.
Seasonal Highlights and Year-Round Interest
Spring Awakening
Spring brings the most dramatic transformation. Coral bells emerge first, pushing fresh leaves from their crowns in a burst of color. New growth is often more intensely colored than mature foliage. Purple fountain grass emerges later, looking unassuming at first. But within weeks, it rockets upward, forming its characteristic fountain shape. The contrast between the low, colorful mounds and the rising grass creates daily visual change that makes spring garden walks exciting.
This is also the time to assess winter damage. Coral bells in exposed locations may have some leaf scorch. Simply remove damaged leaves. The grass may look dead, a tan clump of dried foliage. Do not panic. Wait for new green shoots at the base before cutting back. In cold winters, the grass may die back to the ground but resprout from the crown. In severe winters in marginal zones, it may not return at all, requiring replacement.
Summer Glory
Summer is when purple fountain grass planted with coral bells hits its stride. The grass plumes emerge in early to midsummer, starting deep purple-red and aging through pink to wheat tones. They catch every breeze, adding movement and sound to the garden. Backlit by morning or evening sun, they glow like lanterns. Coral bells bloom in late spring to early summer, sending up wiry stems with tiny bell-shaped flowers in white, pink, or red. Hummingbirds love them.
During summer heat, the combination looks fresh with minimal care. The grass handles heat and humidity beautifully. Coral bells appreciate some afternoon shade in the hottest climates but tolerate full sun with adequate moisture. This is the season to enjoy the fruits of your planting labor. The combination requires little more than occasional watering and admiration.
Fall Transition
Fall brings a shift in mood. The grass plumes fade to warm tan, catching the slanting autumn light beautifully. They persist well into winter, providing structure when most perennials have disappeared. Coral bell foliage often intensifies in color as temperatures drop. Veining becomes more pronounced. Silver overlays become more metallic. The combination takes on a richer, deeper character that feels perfectly aligned with the season.
This is also planting time in mild climates. If you want to expand your planting or replace any losses, early fall gives roots time to establish before winter. The soil is still warm. Rainfall often increases. Plants experience less transplant shock than in spring. In cold climates, fall is the time to apply a protective mulch layer around coral bell crowns after the ground freezes.
Winter Structure
Winter reveals the combination’s quiet strength. In zones where the grass is perennial, it stands as a tawny sculpture, holding snow on its plumes, catching frost on its blades. It provides rare vertical structure in the dormant garden. Coral bells hold their leaves through winter in most climates, a carpet of color when the ground is otherwise brown or white. On sunny winter days, the coral bell foliage warms visibly, a reminder that life persists beneath the surface.
In zones where the grass is an annual, you have a decision. Leave the dried grass standing for winter interest and cut back in spring. Or remove it in late fall and replant in spring. Many gardeners leave it for the winter structure and bird habitat. The seeds feed finches and other small birds. The dense clumps provide shelter. Come spring, the cleanup is part of the seasonal ritual.
Creative Variations and Companion Plants
Adding a Third Player
While purple fountain grass planted with coral bells is complete on its own, adding a third plant can extend the season or add new dimensions. Consider spring bulbs planted among the coral bells. Daffodils, species tulips, or alliums bloom before the grass reaches full size, then their foliage is hidden by the expanding coral bells. Summer annuals like angelonia, salvia, or lantana can fill gaps while the grass establishes. Fall-blooming sedum or asters extend the color show.
For a more complex perennial combination, add a vertical accent like Russian sage (Perovskia) or a late-blooming grass like switchgrass (Panicum). The silver foliage of Russian sage bridges the purple grass and silver coral bells beautifully. Switchgrass adds a different grass form, upright rather than fountain-shaped, creating a grass collection with the purple fountain grass as the star.
Alternative Grass Options
If purple fountain grass is not hardy in your zone or you want a perennial grass, consider alternatives. Purple moor grass (Molinia caerulea subsp. arundinacea) offers similar purple-tinged flower stems on a more upright form. It is hardy to zone 4. Chinese fountain grass (Pennisetum alopecuroides) has a similar fountain habit with tan plumes, hardy to zone 5. ‘Karley Rose’ fountain grass (Pennisetum orientale ‘Karley Rose’) has pink plumes and is hardy to zone 5.
For native plant enthusiasts, switchgrass cultivars like ‘Shenandoah’ (red-tipped foliage) or ‘Heavy Metal’ (blue foliage) provide similar stature and movement. Little bluestem (Schizachyrium scoparium) offers incredible fall color and is native to much of North America. These native grasses support local ecology more fully while providing similar design functions.
Alternative Coral Bell Options
The coral bell world has exploded with new varieties in recent decades. Beyond the color categories mentioned earlier, consider varieties selected for specific traits. ‘Berry Smoothie’ has huge, rose-pink leaves that hold color all season. ‘Forever Purple’ maintains intense purple without fading. ‘Lemon Supreme’ offers clean chartreuse without the veining that some find busy. ‘Midnight Rose’ has dark purple leaves splashed with hot pink spots.
For heat and humidity tolerance, look at the villosa hybrids like ‘Caramel,’ ‘Citronelle,’ and ‘Mocha.’ These handle Southern summers better than many older varieties. For sun tolerance, the ‘Primo’ series offers large, thick leaves that resist scorching. For compact spaces, the ‘Little Cutie’ series stays under ten inches tall. There is truly a coral bell for every situation.
Common Mistakes and How to Avoid Them
Planting Too Deep
The number one killer of coral bells is planting too deep. The crown, where leaves emerge, must sit at or slightly above soil level. Buried crowns rot. When planting, set the root ball half an inch high. Mulch around, not over, the crown. Check periodically. Soil settles. Mulch migrates. Expose the crown if it becomes covered.
Overwatering Established Plants
Both plants prefer lean conditions once established. Overwatering leads to floppy grass growth, reduced plume production, and crown rot in coral bells. Water deeply but infrequently. Let the top few inches of soil dry between waterings. In humid climates, space plants for maximum air circulation to help foliage dry quickly.
Ignoring Mature Size
That cute one-gallon grass plant becomes a four-foot fountain. Those small coral bells become eighteen-inch mounds. Space for mature size, not nursery pot size. Crowded plants compete for resources, develop disease issues, and lose their individual beauty. If you must plant closer for immediate impact, plan to remove or divide plants as they mature.
Wrong Grass for Your Zone
Purple fountain grass is tender. In zones 8 and below, it will not survive winter outdoors. Treat it as an annual or grow in containers you can protect. Do not expect it to return in spring if your ground freezes solid. Many gardeners learn this the hard way. Know your zone. Plan accordingly. The disappointment of losing a beautiful grass clump is entirely avoidable.
Neglecting Division
Coral bells need division every three to four years. Without it, the center dies out, leaving a ring of growth with a dead middle. The plant loses vigor. Flower production declines. Mark your calendar. Divide in spring. It takes ten minutes and gives you free plants to expand your planting or share with friends.
Conclusion
There is a reason purple fountain grass planted with coral bells appears in so many magazine spreads, botanical gardens, and sophisticated landscapes. It works. It works visually, with contrasting textures and harmonious colors. It works culturally, with shared requirements that make maintenance straightforward. It works seasonally, providing interest from spring emergence through winter structure. And it works practically, fitting into containers, borders, mass plantings, and focal points with equal grace.
But beyond the design principles and horticultural logic, this combination simply makes people happy. There is something deeply satisfying about the way the grass moves and the coral bells glow. It feels like a small piece of wild beauty that you can hold in your hand, tend with your own effort, and watch change through the seasons. In a world that often feels chaotic and disconnected, a planting that offers reliable beauty, minimal demands, and maximum reward is a gift.
Whether you are a seasoned gardener looking for a reliable combination for a new bed, a beginner wanting a sure-fire success for your first serious planting, or a designer seeking a versatile palette for client projects, this duo delivers. Start with one grass and three coral bells in a large pot on your patio. Or plant a drift of twenty along your driveway. The scale does not matter. The magic is in the pairing itself. Plant them. Water them. Wait. And watch as your garden becomes a little more beautiful, a little more alive, a little more yours.
Frequently Asked Questions
What are the best coral bell varieties to pair with purple fountain grass?
Top choices include ‘Palace Purple’ for seamless color echo, ‘Lime Rickey’ for high contrast, ‘Caramel’ for warm harmony, and ‘Silver Scrolls’ for sophisticated shimmer. Choose based on your desired color mood.
When should I cut back purple fountain grass?
Cut back in late winter or early spring before new growth emerges. Trim to 6-12 inches above ground. Wear gloves and long sleeves as the blades can be sharp and irritating.
How much water does this combination need once established?
Both plants are drought-tolerant once established. Water deeply during extended dry periods, but allow soil to dry between waterings. Avoid overwatering which causes floppy grass and crown rot.
Will coral bells spread and become invasive?
No, coral bells are well-behaved clump-formers that slowly expand but do not run or self-seed aggressively. They stay where you plant them and are easily divided if they outgrow their space.
Can I plant purple fountain grass and coral bells in clay soil?
Yes, but amend heavy clay with compost and coarse sand or fine gravel to improve drainage. Both plants require good drainage to prevent root and crown rot, especially coral bells.
Do I need to fertilize this plant combination?
Light feeding only. Apply balanced slow-release fertilizer in spring at half rate if soil is poor. Container plants need monthly liquid fertilizer at quarter strength during growing season. Stop fertilizing by late summer.