Catmint Planting Guide

Catmint is a low-maintenance perennial that blooms for months and attracts pollinators. This catmint planting guide covers everything from choosing the right variety to soil prep, planting steps, and ongoing care. Follow these tips and you will enjoy fragrant foliage and lavender-blue flowers all season long.

If you want a plant that practically takes care of itself while putting on a months-long flower show, catmint is the answer. This catmint planting guide walks you through every step so you can grow healthy, floriferous clumps with confidence. I have grown catmint in several gardens across different zones, and it never fails to impress. The aromatic gray-green foliage deters deer and rabbits. The lavender-blue spikes draw bees, butterflies, and hummingbirds like a magnet. Best of all, it asks for very little in return.

Whether you are a beginner gardener or a seasoned pro looking for a reliable filler, this catmint planting guide has you covered. We will talk about picking the best variety for your space, prepping the soil, planting techniques, watering schedules, pruning tricks, and long-term maintenance. By the end, you will know exactly how to get the most out of this garden workhorse. Let us dig in.

Key Takeaways

• Choose the right variety: Nepeta faassenii and Nepeta racemosa are popular compact types. Nepeta subsessilis handles more moisture.
• Plant in full sun: Catmint needs at least six hours of direct light daily for best blooms.
• Well-draining soil is essential: Sandy or loamy soil prevents root rot. Amend heavy clay with grit or compost.
• Space plants properly: Leave 18 to 24 inches between plants for air flow and mature spread.
• Water deeply but infrequently: Established plants are drought tolerant. Overwatering causes floppy growth.
• Shear after first bloom: Cut back by one-third to encourage a second flush of flowers.
• Divide every few years: Spring division keeps clumps vigorous and prevents center die-out.

Quick Answers to Common Questions

When is the best time to plant catmint?

Spring and early fall are ideal. Spring gives roots time to establish before summer heat. Fall works in zones 5 and warmer.

How much sun does catmint need?

Catmint needs at least six hours of direct sun daily. Eight hours is better. Too much shade causes floppy growth and fewer flowers.

How often should I water established catmint?

Established catmint is drought tolerant. Water deeply every two to three weeks during dry spells. Let soil dry between waterings.

Should I fertilize catmint?

No. Catmint prefers lean soil. Fertilizer causes weak, floppy growth. A light compost top-dressing in spring is enough if soil is very poor.

How do I keep catmint blooming all summer?

Shear plants back by one-third after the first flush fades. This stimulates a second bloom cycle. Repeat after the second flush if the season allows.

Understanding Catmint Basics

What Is Catmint

Catmint belongs to the genus Nepeta in the mint family Lamiaceae. It is a cousin to catnip (Nepeta cataria), but it is far more ornamental. Catnip drives cats wild. Catmint has a milder effect on felines and a much showier floral display. The plants form mounds of aromatic, gray-green leaves topped by spikes of small tubular flowers. Bloom color ranges from soft lavender to deep violet-blue. Some cultivars even offer pink or white blooms.

Popular Catmint Varieties

Choosing the right variety is the first step in any catmint planting guide. Here are the most common types you will find at nurseries:

• Nepeta x faassenii ‘Walker’s Low’: Despite the name, this cultivar reaches 24 to 30 inches tall and wide. It won the Perennial Plant of the Year award in 2007. It blooms from late spring to fall with deep lavender-blue flowers.
• Nepeta x faassenii ‘Junior Walker’: A compact version of ‘Walker’s Low’ at 15 to 18 inches tall. Perfect for small spaces or the front of a border.
• Nepeta racemosa ‘Little Titch’: A dwarf variety only 8 to 10 inches tall. Great for rock gardens, edging, or containers.
• Nepeta subsessilis ‘Cool Cat’: Tolerates more moisture and partial shade than other catmints. Larger leaves and pale blue flowers.
• Nepeta ‘Six Hills Giant’: A tall, vigorous cultivar reaching 36 inches. Needs staking in rich soil. Profuse violet-blue blooms.
• Nepeta ‘Blue Wonder’: Compact at 12 to 15 inches with intense blue flowers. Long bloom season.

Hardiness and Climate

Most catmint varieties thrive in USDA zones 3 through 8. Some tolerate zone 9 with afternoon shade. They handle cold winters well. The crown may die back to the ground in harsh zones but returns reliably in spring. In hot, humid climates, look for cultivars bred for heat tolerance like ‘Blue Wonder’ or ‘Walker’s Low’. Good air circulation prevents fungal issues in humid areas.

Selecting the Perfect Planting Site

Sun Requirements

Full sun is non-negotiable for the best catmint performance. Aim for at least six hours of direct sunlight daily. Eight hours is even better. In the deep South, a bit of afternoon shade helps prevent leaf scorch. Too much shade leads to leggy growth, fewer flowers, and floppy stems. If your garden is partly shaded, consider Nepeta subsessilis which tolerates more shade than other species.

Soil Preferences

Catmint thrives in lean, well-draining soil. It does not need rich, fertile ground. In fact, overly rich soil encourages lush foliage at the expense of flowers. It also makes stems weak and prone to flopping. The ideal soil is sandy or gravelly loam with a neutral to slightly alkaline pH between 6.5 and 7.5. Heavy clay is a problem because it holds water. Wet feet cause root rot in catmint.

Testing and Amending Soil

Before planting, do a quick drainage test. Dig a hole 12 inches deep and fill it with water. If it drains in under an hour, you are good. If water sits for hours, amend the soil. Mix in coarse sand, fine gravel, or perlite to improve drainage. Compost helps too but use it sparingly. A 50-50 mix of native soil and grit works well for clay. Raised beds or mounds are another solution for poorly draining sites.

Spacing Considerations

Check the mature width of your chosen variety. Most catmints spread 18 to 30 inches. Space plants accordingly. Crowding reduces air flow and invites powdery mildew. It also makes dividing harder later. For a mass planting, stagger plants in a zigzag pattern rather than straight rows. This looks more natural and fills in faster.

Step-by-Step Catmint Planting Guide

When to Plant

Spring and early fall are the best planting times. Spring planting gives roots time to establish before summer heat. Fall planting works well in zones 5 and warmer. Roots grow in cool soil while top growth slows. Avoid planting in the heat of summer unless you can water diligently. In zone 3 and 4, spring is safer to prevent winter heaving.

Preparing the Planting Hole

Dig a hole twice as wide as the root ball and just as deep. Loosen the soil at the bottom and sides. This helps roots penetrate outward. If your soil is poor, mix a handful of compost into the backfill. Do not add fertilizer at planting time. Catmint does not need it and too much nitrogen causes weak growth.

Removing the Plant from Its Pot

Water the plant in its pot an hour before planting. This reduces transplant shock. Turn the pot upside down while supporting the stem base. Tap the bottom gently. The root ball should slide out. If roots are circling the bottom, tease them apart with your fingers. Make a few vertical cuts with a knife if the root ball is very tight. This encourages outward growth.

Setting the Plant

Place the plant in the hole so the top of the root ball sits level with the surrounding soil. Planting too deep buries the crown and invites rot. Planting too high exposes roots to air. Backfill with the amended soil. Firm gently with your hands to eliminate air pockets. Do not stomp with your feet. Over-compacting hurts drainage.

Watering In

Water thoroughly after planting. A slow, deep soak settles the soil around roots. Apply water at the base, not over the foliage. Wet leaves promote disease. Keep the soil evenly moist but not soggy for the first two to three weeks. This is the critical establishment period. After that, taper off to a normal schedule.

Mulching

Apply a thin layer of mulch around the plant. Gravel, crushed stone, or pine fines work best. Organic mulches like shredded bark hold too much moisture against the crown. Keep mulch an inch away from the stem base. A one-inch layer is plenty. Mulch suppresses weeds and moderates soil temperature.

Watering and Feeding Catmint

Watering Established Plants

Once established, catmint is remarkably drought tolerant. Its deep taproot seeks moisture far below the surface. In most climates, rainfall alone is enough after the first year. During prolonged dry spells, water deeply every two to three weeks. Deep means soaking the root zone 12 to 18 inches down. Frequent shallow watering creates shallow roots and weak plants.

Signs of Overwatering

Yellowing lower leaves, floppy stems, and a general lack of vigor often mean too much water. The soil should dry out between waterings. Stick your finger two inches into the soil. If it feels moist, wait. Catmint prefers to be on the dry side. It is better to underwater than overwater this plant.

Fertilizing: Less Is More

Catmint grows naturally in poor, rocky soils. It does not need regular feeding. In fact, fertilizer often does more harm than good. Excess nitrogen produces soft, sappy growth that flops and attracts aphids. If your soil is extremely poor, a light application of balanced slow-release fertilizer in early spring is okay. Use half the recommended rate. Compost tea once a year is a gentle alternative. Skip fertilizer entirely in rich soil.

Pruning and Maintenance for Maximum Blooms

The Chelsea Chop

In late May or early June (around the time of the Chelsea Flower Show in the UK), cut plants back by one-third to one-half. This technique, called the Chelsea Chop, delays flowering slightly but produces bushier, more compact plants with more flower spikes. It also prevents the center from opening up and flopping. Use clean hedge shears or hand pruners. Make cuts just above a leaf node.

Deadheading for Repeat Blooms

After the first major flush fades, shear the entire plant back by about one-third. Remove spent flower spikes and any leggy growth. This tidies the mound and stimulates a second bloom cycle. You can repeat this after the second flush if the season is long. In hot climates, catmint may pause in midsummer heat. Shear then and wait for cooler fall weather to bring new flowers.

Fall Cleanup

In cold climates, leave the dead foliage standing over winter. It insulates the crown and provides habitat for beneficial insects. Cut back to 3 to 4 inches above ground in early spring before new growth emerges. In mild climates where catmint stays evergreen, trim ragged foliage in late winter to refresh the plant.

Dividing Catmint

Every three to four years, the center of a catmint clump may die out or become woody. Spring is the best time to divide. Dig up the entire clump. Use a sharp spade or knife to cut it into sections. Each division needs healthy roots and several shoots. Replant divisions at the same depth. Water well. Discard the woody center. Division rejuvenates the plant and gives you free plants for elsewhere.

Common Problems and Solutions

Powdery Mildew

This fungal disease appears as a white powdery coating on leaves. It thrives in humid conditions with poor air flow. Prevention is key. Space plants properly. Water at the base, not overhead. Choose resistant cultivars like ‘Walker’s Low’. If mildew appears, remove affected leaves. Spray with a homemade mix of 1 tablespoon baking soda, 1 teaspoon horticultural oil, and 1 gallon water. Apply weekly until conditions improve.

Root Rot

Wilting despite moist soil, yellowing leaves, and a foul smell from the root zone indicate root rot. This is almost always caused by poor drainage. Improve drainage for future plantings. For affected plants, dig them up, trim away black mushy roots, dust with copper fungicide, and replant in a raised bed or container with gritty mix. Recovery is not guaranteed.

Floppy Stems

Rich soil, too much water, or too much shade causes weak, floppy growth. The fix: stop fertilizing, reduce watering, and ensure full sun. The Chelsea Chop in late spring creates shorter, sturdier stems. For tall varieties like ‘Six Hills Giant’, use peony rings or stakes early in the season.

Pests: Aphids and Spider Mites

Catmint is largely pest-free. Occasionally aphids cluster on new growth. Blast them off with a strong jet of water. Spider mites appear in hot, dry weather. They cause stippled, dusty leaves. Increase humidity with occasional overhead watering in the morning. Insecticidal soap works for both if needed. Beneficial insects like ladybugs usually keep populations in check naturally.

Cat Damage

While catmint does not affect cats as intensely as catnip, some felines still roll on it or chew stems. This can flatten plants. If neighborhood cats are a problem, surround plants with chicken wire cages until established. Or plant a sacrificial patch of real catnip nearby to distract them.

Designing with Catmint in the Garden

Companion Plants

Catmint plays well with many perennials. Its soft blue flowers and gray foliage bridge warm and cool colors. Classic pairings include:

• Roses: Catmint hides bare rose canes and complements pink, yellow, or red blooms.
• Salvia: Both love sun and drainage. Blue salvia plus blue catmint creates a cool-toned drift.
• Echinacea: Coneflowers add height and bold color above the catmint mound.
• Yarrow: Flat-topped yarrow flowers contrast with catmint spikes.
• Ornamental grasses: Fine-textured grasses like Stipa or Pennisetum add movement.
• Lavender: Similar needs, complementary fragrance and color.
• Alliums: Globe-shaped allium flowers rise through catmint in late spring.

Garden Styles

Catmint fits many garden styles. In cottage gardens, let it spill over paths and walls. In Mediterranean gardens, pair with lavender, rosemary, and thyme. In pollinator gardens, mass it with other nectar-rich perennials. In modern landscapes, use dwarf varieties in geometric blocks. In rock gardens, tuck ‘Little Titch’ between stones. It also works in containers with other drought-tolerant plants.

Edging and Borders

Low-growing catmints make excellent edging plants. ‘Junior Walker’ and ‘Little Titch’ stay neat all season. Plant them 12 to 18 inches apart along a walkway. They soften hard edges and release fragrance when brushed. For a longer border, repeat the same variety in drifts of three, five, or seven plants. Odd numbers look more natural.

Container Growing

Catmint grows well in pots. Choose a container at least 12 inches wide with drainage holes. Use a gritty potting mix: two parts potting soil, one part perlite or coarse sand. Water when the top inch of soil feels dry. Fertilize once in spring with half-strength balanced fertilizer. Overwinter pots in an unheated garage in zones 5 and colder. In warmer zones, they can stay outside.

Seasonal Care Calendar

Early Spring (March-April)

• Cut back dead foliage to 3-4 inches.
• Apply a thin layer of compost around the base if soil is poor.
• Divide crowded clumps every 3-4 years.
• Check for winter damage and remove any rotted stems.

Late Spring (May-June)

• Perform the Chelsea Chop for bushier plants.
• Stake tall varieties if needed.
• Watch for aphids on new growth.
• Water new plantings regularly.

Summer (July-August)

• Deadhead spent blooms to encourage rebloom.
• Shear back by one-third after first flush.
• Water deeply during drought.
• Monitor for spider mites in hot, dry weather.

Fall (September-October)

• Enjoy second or third flush of flowers.
• Stop deadheading in early fall to let plants harden off.
• Plant new catmint in early fall (zones 5+).
• Apply gravel mulch if not done in spring.

Winter (November-February)

• Leave foliage standing for winter protection.
• In containers, move to sheltered spot in cold zones.
• Plan next year’s garden design.
• Order new varieties for spring planting.

Propagating Catmint

Division

Division is the easiest and most reliable propagation method. Do it in early spring as new growth emerges. Dig the clump, split into sections with a sharp spade, and replant immediately. Water well. Divisions bloom the same year.

Stem Cuttings

Take softwood cuttings in late spring or early summer. Cut 4 to 6 inch stems just below a leaf node. Remove lower leaves. Dip the cut end in rooting hormone. Stick in a pot of moist perlite or sand. Cover with a plastic bag to maintain humidity. Place in bright indirect light. Roots form in 3 to 4 weeks. Harden off and transplant.

Seed

Catmint grows from seed but named cultivars do not come true. Species types like Nepeta racemosa and Nepeta mussinii self-sow moderately. Sow seeds indoors 6 to 8 weeks before last frost. Barely cover seeds; they need light to germinate. Keep at 65 to 70°F. Germination takes 10 to 20 days. Transplant seedlings after frost danger passes.

Harvesting and Using Catmint

Cut Flowers

Catmint makes a lovely cut flower for small arrangements. Harvest stems when half the flowers on a spike are open. Cut in the morning after dew dries. Place immediately in cool water. Stems last 5 to 7 days. The fragrance is subtle but pleasant indoors.

Herbal Uses

Catmint leaves make a soothing tea. Steep 1 tablespoon fresh leaves (1 teaspoon dried) in a cup of boiling water for 5 minutes. It has a mild minty flavor with citrus notes. Traditionally used for relaxation and digestion. The essential oil is used in aromatherapy. Pregnant women should avoid medicinal amounts.

Drying Catmint

Cut stems just before full bloom. Bundle small bunches and hang upside down in a dark, airy room. When crisp, strip leaves from stems. Store in airtight jars away from light. Dried catmint retains fragrance for about a year.

Catmint vs. Catnip vs. Cat Thyme

Catmint (Nepeta x faassenii and relatives)

Ornamental perennial. Showy flowers. Gray-green foliage. Mild effect on cats. Drought tolerant. Long bloom season. This is the plant covered in this catmint planting guide.

Catnip (Nepeta cataria)

Herbaceous perennial. White flowers with purple spots. Coarser, greener leaves. Intense effect on cats. Spreads aggressively by seed. Grown for cats, not ornament. Can be weedy.

Cat Thyme (Teucrium marum)

Low shrubby perennial. Tiny pink flowers. Very strong scent. Cats love it. Not a true thyme. Needs sharp drainage and full sun. Less common in nurseries.

Frequently Asked Questions About Catmint

Is catmint invasive

Catmint spreads slowly by underground rhizomes but is not considered invasive. It does not seed aggressively like catnip. Named cultivars are sterile or nearly so. Divide every few years to keep it in bounds.

Why is my catmint not blooming

Too much shade, too much fertilizer, or overcrowding are the usual culprits. Ensure at least 6 hours of sun. Stop fertilizing. Divide if the clump is old and woody. The Chelsea Chop can also stimulate more flower spikes.

Can catmint grow in shade

Catmint tolerates light shade but blooms poorly and gets leggy. For partial shade, choose Nepeta subsessilis cultivars. Even then, expect fewer flowers.

How long does catmint live

With division every 3 to 4 years, catmint lives indefinitely. Individual clumps decline after 4 to 5 years without division. The center dies out. Regular division resets the clock.

Does catmint repel mosquitoes

Catmint contains nepetalactone, which repels mosquitoes in lab studies. In the garden, the effect is minimal. Crushing leaves and rubbing on skin works better than just having plants nearby.

Can I grow catmint indoors

Catmint needs full sun and good air flow. It does not thrive indoors long-term. You can overwinter a pot in a sunny window but expect leggy growth. Move it outside in spring.

Conclusion

This catmint planting guide has covered everything from variety selection to seasonal care. Catmint is one of those rare plants that gives so much and asks for so little. Sun, drainage, and an occasional haircut. That is the whole secret. In return, you get months of pollinator-friendly blooms, aromatic foliage, and a plant that knits the garden together beautifully.

Start with one plant this spring. Watch it grow. Shear it back after the first bloom. Enjoy the second show. Before you know it, you will be dividing it to share with friends. That is the catmint cycle. Simple, rewarding, and endlessly repeatable. Happy planting.

Frequently Asked Questions

What is the difference between catmint and catnip?

Catmint (Nepeta x faassenii) is an ornamental perennial with showy lavender-blue flowers and gray-green foliage. It has a mild effect on cats. Catnip (Nepeta cataria) is grown for cats, has white flowers, coarser leaves, and spreads aggressively by seed.

Can catmint survive winter in zone 4?

Yes, most catmint varieties are hardy to USDA zone 3. The foliage dies back in winter but the crown survives. Leave dead stems standing for insulation and cut back in early spring.

Why does my catmint flop open in the middle?

Flopping is caused by rich soil, too much water, too much shade, or an old clump that needs dividing. The Chelsea Chop in late spring creates shorter, sturdier stems. Divide every 3-4 years to prevent center die-out.

Is catmint deer resistant?

Yes, catmint is highly deer and rabbit resistant. The aromatic foliage contains compounds that deter browsing. It is a great choice for gardens with heavy deer pressure.

Can I grow catmint in a container?

Yes, catmint grows well in pots. Use a container at least 12 inches wide with drainage holes. Fill with a gritty mix (2 parts potting soil, 1 part perlite). Water when the top inch of soil is dry. Overwinter in an unheated garage in cold zones.

How do I propagate catmint?

The easiest method is division in early spring. Dig up the clump, cut into sections with a sharp spade, and replant. Stem cuttings in late spring and seed (for species types) also work but division is fastest and most reliable.