Companion Plants for Blue Moon Catmint

Blue Moon catmint thrives alongside drought-tolerant perennials like salvia, coneflower, and Russian sage. These companions share similar sun and soil needs while attracting pollinators and repelling pests naturally.

Key Takeaways

• Blue Moon catmint loves full sun and well-drained soil: Choose companions with identical growing requirements for effortless maintenance.
• Salvia and Russian sage are top flowering partners: They bloom simultaneously, creating a cohesive purple-blue color palette that pollinators adore.
• Ornamental grasses add texture and movement: Grasses like feather reed grass provide vertical contrast without competing for resources.
• Herbs such as lavender and thyme enhance pest resistance: Their aromatic oils confuse pests while thriving in the same lean conditions.
• Avoid moisture-loving plants like hostas and ferns: These shade-tolerant species will struggle in the dry, sunny spots catmint prefers.
• Space plants properly to prevent overcrowding: Give each perennial room to reach its mature width for better air circulation and disease prevention.
• Deadhead spent blooms to extend the flowering season: Regular trimming encourages a second flush of flowers from both catmint and its companions.

Quick Answers to Common Questions

What are the best flowering companions for Blue Moon catmint?

Salvia, Russian sage, coneflower, yarrow, and bee balm are the top flowering companions. They share the same sun and soil needs while providing continuous bloom and pollinator support.

Can I plant lavender next to Blue Moon catmint?

Yes, lavender is an ideal companion. Both are Mediterranean natives that thrive in full sun, lean soil, and sharp drainage. Their silver and blue-green foliage creates a beautiful textural contrast.

What plants should I avoid planting near catmint?

Avoid moisture-loving plants like hostas, ferns, and astilbes. Also avoid heavy feeders like roses and dahlias, plus aggressive spreaders like culinary mint and gooseneck loosestrife.

How far apart should I space Blue Moon catmint from its companions?

Space catmint 20 to 24 inches apart on center. Match spacing to each companion’s mature width. Proper spacing ensures good air circulation and prevents disease.

When should I cut back Blue Moon catmint for a second bloom?

Shear catmint back by half in early July after the first flush fades. Fresh growth and flowers will return within two weeks for a late-summer show.

Getting to Know Blue Moon Catmint

If you have ever brushed past a patch of catmint on a warm summer afternoon, you know the scent. It is minty, slightly citrusy, and utterly irresistible to bees. Blue Moon catmint (Nepeta x faassenii ‘Blue Moon’) takes everything gardeners love about classic catmint and dials it up. This cultivar forms a tidy mound of gray-green foliage topped with spikes of lavender-blue flowers that appear in late spring and keep coming until frost.

Unlike some sprawling catmints, Blue Moon stays compact. It reaches about 18 to 24 inches tall and wide. That neat habit makes it a dream for edging paths, tucking into rock gardens, or massing along a sunny border. It laughs at drought, shrugs off poor soil, and deer want nothing to do with it. But even a superstar plant performs better with the right supporting cast. That is where companion planting comes in.

Why Companion Planting Matters for Catmint

Shared Growing Conditions Reduce Work

Companion planting is not just about looks. It is about matching plants that want the same things. Blue Moon catmint demands full sun. It needs at least six hours of direct light daily. It also insists on sharp drainage. Wet feet in winter will kill it faster than anything else. When you pair it with plants that share these preferences, you water less, fertilize less, and worry less.

Pollinator Magnetism Multiplies

Catmint is a pollinator powerhouse. Bees, butterflies, and hoverflies flock to its nectar-rich blooms. Add companions that flower at the same time, and you create a buffet no beneficial insect can resist. More pollinators mean better fruit set on nearby vegetables. It also means a livelier, healthier garden ecosystem overall.

Natural Pest Confusion

Many aromatic herbs and perennials release volatile oils that mask the scent of neighboring plants. Pests locate their hosts by smell. Confuse their radar, and they move on. Catmint itself contains nepetalactone, which repels aphids, squash bugs, and even mosquitoes. Surround it with other aromatic allies, and you build a invisible shield around your beds.

Extended Seasonal Interest

Blue Moon catmint has a long bloom window, but it is not eternal. There are gaps in early spring and late fall. Strategic companions fill those voids. Spring bulbs pop up before catmint wakes up. Autumn-blooming sedums take the stage after catmint slows down. The result is a border that never looks tired.

Best Flowering Perennial Companions

Salvia: The Color Echo Partner

If you want a planting that looks designed by a pro, pair Blue Moon catmint with perennial salvia. Both produce vertical flower spikes in shades of blue, purple, and violet. Salvia nemorosa cultivars like ‘Caradonna’ or ‘May Night’ bloom in late spring, right alongside the first catmint flush. Their dark stems add drama. The color harmony is instant and sophisticated.

Salvia shares catmint’s love of lean soil and full sun. Both are drought-tolerant once established. Deadhead salvia after its first bloom, and it often reblooms in sync with catmint’s second wave. The two plants essentially dance together all season.

Russian Sage: The Airy Backdrop

Russian sage (Perovskia atriplicifolia) brings height and haze. Its silvery stems and lavender-blue flowers create a see-through veil behind the denser catmint mound. Varieties like ‘Denim ‘n Lace’ stay upright without staking. They reach three to four feet tall, giving your border a layered look without blocking light.

Like catmint, Russian sage thrives on neglect. It hates wet soil and rich fertilizer. Plant it in the same bed, and you will never need to amend or irrigate specially for either one. The combination also extends the blue theme from early summer deep into autumn.

Coneflower: The Bold Contrast

Echinacea adds a completely different flower shape. Its large, daisy-like blooms with prominent cones stand out against catmint’s fuzzy spikes. Choose purple coneflower (Echinacea purpurea) for a monochromatic scheme. Or go for ‘Cheyenne Spirit’ mixes in orange, red, and yellow to warm up the cool catmint tones.

Coneflowers have deep taproots that break up heavy soil, benefiting shallow-rooted neighbors. They also provide winter seed heads for goldfinches. Leave the spent flowers standing. The birds will thank you, and the architectural forms look striking under frost.

Yarrow: The Flat-Topped Filler

Achillea millefolium offers flat corymbs of tiny flowers in white, yellow, pink, or terracotta. ‘Moonshine’ with its canary-yellow heads is a classic pairing with blue catmint. The color contrast is cheerful and high-impact. Yarrow spreads slowly by rhizomes, knitting the border together and suppressing weeds.

Yarrow tolerates the same brutal conditions as catmint. Heat, humidity, poor soil — it takes it all. It also attracts predatory insects like lady beetles and lacewings. Their larvae devour aphids and other soft-bodied pests on nearby plants.

Bee Balm: The Hummingbird Favorite

Monarda didyma brings shaggy, tubular flowers in red, pink, or purple. ‘Jacob Cline’ is a mildew-resistant red that hummingbirds fight over. Bee balm prefers slightly more moisture than catmint, but it adapts well to average garden soil if mulched. Plant it where the hose reaches occasionally.

The combination of catmint, bee balm, and coneflower creates a pollinator trifecta. Each flower shape serves a different insect mouthpart. You support maximum biodiversity in minimum space.

Best Herb and Edible Companions

Lavender: The Mediterranean Twin

Lavender and catmint are kindred spirits. Both hail from the Mediterranean basin. Both demand sun, grit, and excellent drainage. Both hate humidity and wet crowns. English lavender (Lavandula angustifolia) cultivars like ‘Hidcote’ or ‘Munstead’ stay compact and bloom in early summer, overlapping perfectly with catmint.

The silver foliage of lavender echoes catmint’s gray-green leaves. The texture contrast — needle-like versus soft and crinkled — adds subtle sophistication. Harvest lavender stems for sachets. Shear catmint for tea. Both plants give back generously.

Thyme: The Living Mulch

Creeping thyme (Thymus serpyllum) hugs the ground between taller perennials. It forms a fragrant carpet that suppresses weeds and retains soil moisture. When you step on it, the scent rises. It blooms in pink or purple haze in early summer, feeding tiny native bees.

Thyme tolerates foot traffic. Plant it along stepping stones that cut through your catmint border. It softens hard edges and fills gaps where mulch would otherwise wash away. Culinary thyme varieties work too, but they mound higher and spread less.

Oregano: The Pollinator Buffet

Ornamental oregano (Origanum laevigatum ‘Herrenhausen’) produces wiry stems draped in hop-like purple bracts. It blooms for months. The flowers are technically bracts, so they hold color long after true petals would fade. Culinary oregano (Origanum vulgare) spreads aggressively. Give it a container or a dedicated herb bed instead.

Both oregano types attract beneficial wasps. These tiny parasitoids lay eggs in caterpillars and beetle larvae. Your vegetable patch nearby reaps the rewards.

Sage: The Structural Accent

Common sage (Salvia officinalis) forms a woody sub-shrub with pebbly, aromatic leaves. Purple sage (‘Purpurascens’) and tricolor sage add foliage color before a single flower opens. Sage spikes in early summer with blue-purple blooms that mirror catmint.

Sage gets woody after a few years. Replace it or prune hard in spring to keep it productive. Its strong scent confuses cabbage moths and carrot flies. Plant it near brassicas or carrots for a functional border that protects food crops.

Chives: The Early Bloomer

Chives (Allium schoenoprasum) wake up early. Their grassy shoots appear in March. By May, they sport pink-purple pom-pom flowers that bees adore. They finish blooming just as catmint hits its stride. The succession keeps nectar flowing without a gap.

Chives deter Japanese beetles and aphids. Their sulfur compounds are systemic. They also self-sow modestly. Deadhead before seeds drop if you want to control spread. The flowers are edible. Sprinkle them on salads for a mild onion kick.

Ornamental Grasses for Texture and Movement

Feather Reed Grass: The Vertical Exclamation

Calamagrostis x acutiflora ‘Karl Foerster’ is the gold standard for upright grass. It shoots up straight, narrow plumes in early summer that turn wheat-gold by August. The vertical line punctuates the mounded forms of catmint and its flowering friends. It stands through winter, catching frost and snow beautifully.

This grass is sterile. It will not self-sow invasively. It tolerates clay better than many grasses. Plant it in groups of three or five for a rhythmic beat along the border.

Blue Fescue: The Miniature Mirror

Festuca glauca ‘Elijah Blue’ forms tight, spiky domes of intense silver-blue foliage. It echoes catmint’s leaf color in a completely different texture. Use it as an edger along the front of the bed. It stays under 12 inches. It is evergreen in mild winters.

Blue fescue dislikes wet crowns. Plant it on a slight mound or in a raised bed. Divide every few years to prevent center die-out. It pairs especially well with lavender and catmint for a silver-blue tapestry.

Little Bluestem: The Native Prairie Spirit

Schizachyrium scoparium is a North American native that turns copper-orange in fall. ‘The Blues’ cultivar has striking blue summer foliage. It hosts skipper butterfly caterpillars. Its deep roots improve soil structure and sequester carbon.

Little bluestem thrives in the same lean, dry soil as catmint. It adds a wild, meadow-like quality to designed plantings. Combine it with coneflower and black-eyed Susan for a prairie-inspired border that supports wildlife year-round.

Mexican Feather Grass: The Soft Motion

Nassella tenuissima (formerly Stipa tenuissima) flows like hair in the breeze. Its thread-thin blades and feathery seed heads catch light magically. It self-sows readily in gravel and cracks. In moist climates, it can be aggressive. In dry Western gardens, it is a star.

Use it sparingly as an accent. A single clump backlit by evening sun is unforgettable. It contrasts dramatically with the solid mass of catmint. Just watch for unwanted seedlings and pull them early.

Plants to Avoid Near Blue Moon Catmint

Moisture Lovers: Hostas, Ferns, Astilbes

Shade-tolerant, moisture-loving perennials have no place beside catmint. Hostas want consistent moisture and dappled light. Ferns need humid air and organic-rich soil. Astilbes demand wet feet. If you force them into catmint’s dry, sunny bed, they will crisp and decline. If you water to keep them happy, the catmint will rot.

Resist the urge to mix sun and shade plants in the same bed. Create separate zones. Your plants will thank you with vigor instead of struggle.

Heavy Feeders: Roses, Delphiniums, Dahlias

Roses love rich, amended soil and regular feeding. Delphiniums need deep, fertile loam and staking. Dahlias require compost, consistent water, and winter lifting in cold zones. Catmint hates all of that. Fertile soil makes catmint floppy and reduces its essential oil content. The scent fades. The pest resistance drops.

If you adore roses, plant them in a dedicated rose bed with companions that share their appetite. Keep catmint in the lean, sunny border where it belongs.

Aggressive Spreaders: Mint, Bee Balm (Wild Types), Gooseneck Loosestrife

Culinary mint (Mentha spp.) runs underground like a fugitive. It will choke catmint within a season. Wild bee balm (Monarda fistulosa) spreads fast by rhizomes. Gooseneck loosestrife (Lysimachia clethroides) is beautiful but thuggish. These plants belong in containers or bordered beds with deep edging.

Catmint itself can self-sow modestly. It is not invasive, but you may find seedlings. They are easy to pull or transplant. Deadhead if you want zero volunteers.

Tall, Dense Shrubs That Cast Shade

Butterfly bush (Buddleia), large viburnums, and lilacs eventually shade out sun-loving perennials. Catmint needs open sky. If you plant it near a shrub, keep it on the south or west side where light reaches it all day. Prune the shrub to maintain an open canopy.

Better yet, use catmint as a skirt around the base of a standard (tree-form) rose or small ornamental tree. The catmint hides bare legs while basking in full sun.

Designing Your Companion Planting Layout

Start with the Bones: Structure First

Before you buy a single perennial, sketch your bed. Mark north. Note sun patterns through the day. Identify drainage spots. Blue Moon catmint goes in the hottest, driest zone. Place taller companions like Russian sage and coneflower toward the back (north side) or center of an island bed. Lower plants — thyme, blue fescue, chives — go in front.

Group plants in odd numbers: threes, fives, sevens. Naturalistic drifts look better than alternating rows. Repeat key plants along the border to create rhythm. A sweep of catmint, then salvia, then catmint again ties the design together.

Layer by Bloom Time

Aim for continuous color. Early spring: bulbs (alliums, tulips, daffodils) planted among dormant catmint crowns. Late spring: catmint, salvia, chives, yarrow first flush. Midsummer: coneflower, bee balm, ornamental oregano, second catmint wave. Late summer: Russian sage, sedum ‘Autumn Joy’, goldenrod. Fall: asters, little bluestem seed heads, dried catmint stems.

Overlap bloom windows. No gaps. No lulls. The pollinators stay. The garden never looks “done.”

Consider Foliage, Not Just Flowers

Flowers are fleeting. Foliage lasts months. Mix leaf shapes: feathery (yarrow), strappy (daylilies, though they want more water), needle-like (lavender, rosemary), broad (sage), grassy (fescue, bluestem). Mix colors: silver, blue-green, deep green, purple, chartreuse.

Artemisia ‘Silver Mound’ adds a soft silver pillow. Heuchera ‘Palace Purple’ brings burgundy ruffles in part-shade edges. Sedum ‘Angelina’ creeps with neon chartreuse needles. These foliage plants carry the show when flowers pause.

Space for Air and Growth

Read the tag. Resist the urge to pack plants tight for instant impact. Crowding invites fungal disease. It reduces air flow. It creates competition for water and nutrients. Give each plant its mature width plus a few inches. Mulch the gaps with gravel or pine fines until they fill in.

Blue Moon catmint spreads to 24 inches. Plant centers 20 to 24 inches apart. Salvia ‘May Night’ spreads 18 inches. Space accordingly. In two years, the bed will look lush, not cramped.

Edge with Intention

The front edge of a border defines its character. Low creepers like thyme, sedum, or dwarf catmint (‘Kit Cat’ or ‘Little Trudy’) spill onto paths. They soften hardscape. They release scent when brushed. They invite touch.

If the bed borders lawn, install a clean edge — steel, stone, or a deep cut trench. Grass rhizomes are sneaky. They will invade the loose soil of your perennial bed. A barrier saves hours of weeding later.

Care Tips for a Thriving Companion Garden

Water Deeply, Infrequently

Established catmint and its Mediterranean companions want deep soakings, not daily sprinkles. Water once a week in the first season. After that, only during prolonged drought. Use a soaker hose or drip irrigation. Keep foliage dry to prevent foliar diseases.

New plantings need more attention. Check soil moisture two inches down. If dry, water. If moist, wait. Overwatering kills more drought-tolerant plants than underwatering.

Mulch with Mineral, Not Organic

Wood chips and bark hold moisture against crowns. They break down into rich humus — exactly what catmint hates. Use pea gravel, crushed granite, or chicken grit. These mineral mulches reflect heat, improve drainage, and mimic the rocky soils these plants evolved in.

A one-inch layer is plenty. Keep mulch away from stem bases. A collar of gravel around each crown prevents rot.

Fertilize Never (Or Barely)

Rich soil makes weak, floppy growth. It reduces essential oils. It invites aphids. Skip fertilizer entirely for catmint, lavender, Russian sage, thyme, oregano, and grasses. If your soil is pure sand or construction fill, top-dress with a half-inch of compost in early spring. That is it.

Container-grown plants are different. They need a slow-release balanced fertilizer once a year in spring. But in the ground? Lean is mean. Mean is good.

Deadhead for Rebloom

Shear catmint back by half after its first flush fades in early July. Use hedge shears or a string trimmer. It looks brutal. Two weeks later, fresh foliage and flower spikes emerge. You get a second show in August and September.

Deadhead salvia, yarrow, and coneflower individually. Snip spent stems to a leaf node. Leave some coneflower heads for birds. Remove bee balm flowers to prevent powdery mildew spread.

Divide Every Three to Four Years

Catmint centers die out. The plant becomes a ring. Dig it in early spring or early fall. Tease apart the living outer sections. Replant the vigorous pieces. Discard the woody center. Share extras with neighbors.

Grasses, yarrow, and bee balm also benefit from division. Salvia and Russian sage dislike disturbance. Leave them be unless they outgrow their space.

Winter Cleanup: Wait Until Spring

Do not cut everything down in November. Standing stems protect crowns from freeze-thaw cycles. Seed heads feed birds. Hollow stems shelter native bees. The winter garden has beauty — frost on grass plumes, snow on sedum caps.

Cut back in late February or March, before new growth emerges. Use the chop-and-drop method. Cut stems into six-inch pieces. Let them fall as mulch. They decompose in place, returning nutrients slowly.

Real-World Companion Planting Recipes

The Pollinator Power Strip (4 ft x 10 ft)

Back row: Russian sage ‘Denim ‘n Lace’ (3 plants). Middle: Blue Moon catmint (5 plants), Salvia ‘May Night’ (3 plants), Coneflower ‘Magnus’ (3 plants). Front: Creeping thyme (6 plugs), Blue fescue ‘Elijah Blue’ (5 plants). Edge: Chives (clumps every 12 inches).

This rectangle fits along a driveway or fence. It blooms May through October. It feeds bees, butterflies, hummingbirds, and goldfinches. Maintenance: one shear in July, one cleanup in March.

The Mediterranean Courtyard Corner (6 ft triangle)

Anchor: Dwarf olive or fig in a large pot (center back). Ring: Lavender ‘Hidcote’ (3), Blue Moon catmint (3), Sage ‘Purpurascens’ (2), Ornamental oregano ‘Herrenhaus’ (2). Ground: Thyme ‘Elfin’ between stepping stones. Accent: Feather reed grass ‘Karl Foerster’ (1 clump).

This design evokes a Greek hillside. The pot provides a focal point. The herbs are harvestable. The grass adds movement. All plants share the same watering schedule: almost never.

The Hellstrip Hero (3 ft x 20 ft sidewalk strip)

Street side: Little bluestem ‘The Blues’ (7 plants, spaced 24 in). Middle: Blue Moon catmint (10 plants, spaced 20 in), Yarrow ‘Moonshine’ (5 plants). House side: Sedum ‘Autumn Joy’ (5 plants), Creeping thyme (plugs between pavers).

Hellstrips bake. They get salt, compaction, dog traffic, and zero irrigation. This lineup laughs at all of it. The bluestem filters road dust. The catmint and yarrow handle heat. The sedum stores water. The thyme takes footsteps.

The Cottage Garden Mix (Island bed, 8 ft diameter)

Center: Feather reed grass (1). Ring 1: Blue Moon catmint (7), Coneflower ‘White Swan’ (3), Bee balm ‘Jacob Cline’ (3). Ring 2: Salvia ‘Caradonna’ (5), Yarrow ‘Terracotta’ (3). Edge: Chives, Thyme, Blue fescue alternating.

This is loose, romantic, and colorful. The white coneflower cools the palette. The terracotta yarrow warms it. The grass anchors the center. It looks like it evolved there. It didn’t. You planted it. But it feels inevitable.

Troubleshooting Common Issues

Catmint Flopping Open

Cause: Too much water, too rich soil, or not enough sun. Fix: Stop irrigating. Mulch with gravel. Shear hard after first bloom. If it still flops, move it to a hotter spot in fall.

Powdery Mildew on Bee Balm or Phlox

Cause: Humidity, crowding, overhead watering. Fix: Thin plants for air flow. Water at soil level. Choose resistant cultivars. Spray with diluted milk (1:9) or potassium bicarbonate at first sign.

Grasses Not Standing Up

Cause: Too much shade, too much nitrogen, or wrong variety. Fix: Move to full sun. Stop fertilizing. Switch to ‘Karl Foerster’ or ‘Northwind’ switch grass for ironclad upright habit.

Center Die-Out in Catmint or Yarrow

Cause: Age. Woody centers stop producing. Fix: Divide in spring. Replant outer growth. Compost the dead center. Do this every three years preventatively.

Rabbits Eating New Growth

Cause: Hungry bunnies in spring. Fix: Sprinkle blood meal or commercial repellent. Cage young plants with chicken wire until established. Mature aromatic foliage usually deters them.

Conclusion

Blue Moon catmint is a gift that keeps giving. It asks for so little — sun, drainage, neglect — and returns months of color, scent, and life. But it does not have to stand alone. The right companions elevate it from a pretty plant to a functioning plant community.

Choose partners that share its tough constitution. Salvia, Russian sage, coneflower, yarrow. Lavender, thyme, oregano, sage. Grasses that catch the wind and the light. Avoid the moisture lovers, the heavy feeders, the thugs. Design in layers. Space for air. Mulch with stone. Water deep and rare.

Then step back. Watch the bees tumble in the catmint spikes. Smell the lavender on a July breeze. Hear the goldfinches argue over coneflower seeds in October. That is the garden you built. Not a collection of plants. A living system. And it all started with one unassuming mound of gray-green leaves and blue flowers.

Your shovel is waiting. The nursery opens at nine. Go make something beautiful.

Frequently Asked Questions

Does Blue Moon catmint attract cats like catnip?

Blue Moon catmint contains nepetalactone but in lower concentrations than true catnip (Nepeta cataria). Some cats show interest, but most ignore it. The plant is primarily grown for ornamental value and pollinator support.

Is Blue Moon catmint invasive?

No, Blue Moon catmint is a sterile hybrid that does not spread by runners. It may self-sow lightly in ideal conditions, but seedlings are easy to remove or transplant. It stays in a well-behaved clump.

Can Blue Moon catmint grow in partial shade?

It tolerates light afternoon shade in hot climates, but flowering decreases and stems become floppy. For best form and bloom, provide at least six hours of direct sun daily.

How do I propagate Blue Moon catmint?

Divide established clumps in early spring or early fall. Take 4-inch stem cuttings in late spring before flowering. Root in moist sand or perlite. Seed propagation is unreliable since it is a sterile hybrid.

What is the difference between Blue Moon and Walker’s Low catmint?

Blue Moon is more compact (18-24 inches) with a tidier mound. Walker’s Low reaches 30-36 inches and sprawls more. Both have similar flowers, but Blue Moon fits smaller spaces better.

Why is my catmint turning brown in the center?

Center die-out is natural as the plant ages. Woody centers stop producing new growth. Divide the plant every three to four years in spring, replanting the vigorous outer sections and discarding the dead center.