What to Plant Behind Catmint

Catmint (Nepeta) is a versatile, low-maintenance perennial that thrives in sunny spots. Plant taller companions like Russian sage, coneflowers, or ornamental grasses behind it to create depth and continuous bloom. Choose plants with similar water and sun needs for a harmonious, pollinator-friendly garden bed.

Key Takeaways

• Height matters: Choose plants 2-4 feet taller than catmint to create a layered backdrop without shading it out.
• Match growing conditions: Select companions that love full sun and well-drained soil, just like catmint.
• Stagger bloom times: Pick plants that flower before, during, and after catmint for season-long color.
• Consider texture contrast: Pair catmint’s soft, billowy form with spiky, architectural, or grassy textures.
• Support pollinators: Combine catmint with other nectar-rich perennials to create a pollinator highway.
• Mind the spread: Give catmint room to sprawl; avoid aggressive spreaders that will crowd it.
• Plan for maintenance: Choose companions with similar low-care needs to keep the bed easy to manage.

Quick Answers to Common Questions

What is the best plant to put behind catmint?

Russian sage is widely considered the best companion behind catmint. It shares identical growing needs — full sun, lean soil, drought tolerance — and its airy lavender spikes rise 3-4 feet, creating a seamless purple haze above catmint’s mounded form.

Can I plant roses behind catmint?

Yes, but choose disease-resistant shrub roses or climbers on a trellis. Roses need richer soil and more water than catmint. Plant them 3-4 feet back, amend their planting hole with compost, and irrigate separately. Catmint at the base hides bare rose canes beautifully.

How far behind catmint should I plant taller perennials?

Space taller perennials 24-36 inches behind catmint’s mature edge. Catmint spreads 2-3 feet wide. Measure from the center of the catmint clump, add its mature radius plus 12-18 inches for the companion’s root zone and air circulation.

Do ornamental grasses spread aggressively behind catmint?

Most recommended grasses — feather reed grass, switchgrass, little bluestem — are clump-formers that stay put. They expand slowly by widening the crown, not running. Miscanthus can self-seed in warm climates; choose sterile cultivars or deadhead plumes.

Can I plant vegetables behind catmint?

Not ideal. Vegetables need rich, moist soil and regular feeding — opposite of catmint’s lean, dry preferences. Catmint’s sprawling habit also shades low crops. If you must, plant tall trellised crops (pole beans, indeterminate tomatoes) 4+ feet back with dedicated irrigation.

Why Catmint Deserves a Supporting Cast

Catmint is one of those plants that makes gardening feel easy. It blooms for months, shrugs off drought, and brings bees and butterflies by the dozen. But even a star performer shines brighter with the right supporting cast. Knowing what to plant behind catmint transforms a pretty border into a layered, dynamic garden scene that looks good from spring through frost.

The trick is understanding catmint’s habit. Most varieties form a loose mound 12 to 24 inches tall and wide, with stems that gently spill forward. That means the “back” of the bed needs plants that rise above this mound without engulfing it. You want height, yes, but also plants that play nice — same sun, same soil, same low-drama attitude.

Understanding Catmint’s Growing Preferences

Before picking companions, let’s get clear on what catmint actually wants. This isn’t a fussy plant, but it has boundaries.

Sun and Soil Requirements

Catmint demands full sun — at least six hours of direct light daily. In shade, it gets leggy, flops over, and blooms poorly. Soil should drain sharply. Heavy clay that stays soggy in winter is a death sentence. If your soil is dense, amend with grit or plant in a raised bed. The ideal pH is neutral to slightly alkaline, but catmint adapts.

Water Needs and Drought Tolerance

Once established, catmint is impressively drought-tolerant. Water deeply but infrequently to encourage deep roots. Overwatering leads to weak growth and fewer flowers. Companions should share this “tough love” approach. Thirsty plants like astilbe or ligularia will struggle beside it.

Growth Habit and Spread

Catmint spreads by underground runners, forming a widening clump. Some cultivars like ‘Walker’s Low’ can reach 3 feet across in a few years. It also self-seeds modestly. Plan for this spread when spacing companions. A plant that sits 18 inches behind a young catmint may get swallowed in three seasons.

Design Principles for Planting Behind Catmint

Good garden design isn’t just a plant list. It’s about relationships — height, color, texture, time. Here’s how to think like a designer when choosing what goes behind your catmint.

The Layering Rule: Height Gradients

Aim for a clear height step. Catmint at 18 inches. Middle layer at 30-36 inches. Back layer at 4-5 feet. This stair-step lets every plant be seen. Avoid a wall of uniform height — it reads as a hedge, not a border. If your bed is viewed from one side only, the tallest plants go at the very back. If it’s an island bed, tallest in the center, stepping down to catmint at the edges.

Color Harmony and Contrast

Catmint’s flowers are typically lavender-blue, a cool tone that plays well with almost anything. For harmony, pair with other blues, purples, pinks, and whites. For pop, add hot colors — orange geum, red hot poker, yellow coreopsis. The silvery-green foliage of catmint also bridges warm and cool palettes beautifully.

Bloom Succession for Continuous Interest

Catmint’s main flush is late spring to early summer, with a lighter rebloom if sheared back. Choose companions that fill the gaps. Early: alliums, baptisia, salvia. Mid: coneflowers, bee balm, yarrow. Late: sedum, asters, goldenrod, ornamental grasses. This relay race keeps the bed alive for six months.

Texture Play: Soft Meets Structural

Catmint is soft, billowy, aromatic. Contrast it with vertical spikes (salvia, veronicastrum), bold umbels (achillea, sedum), or fine linear blades (grasses, iris). Texture contrast stops the eye from glazing over. A bed of only mounded plants feels monotonous. A bed of only spiky plants feels aggressive. Mix both.

Top Perennial Companions for Behind Catmint

These perennials share catmint’s love of sun and lean soil. They rise above it gracefully and bring their own seasonal stars.

Russian Sage (Perovskia atriplicifolia)

This is the classic partner. Airy lavender-blue spikes on silver stems reach 3-4 feet. It blooms as catmint peaks, creating a purple haze effect. Both love heat, drought, and poor soil. ‘Denim ‘n Lace’ stays more upright; ‘Little Spire’ is compact for smaller beds. Deer ignore both.

Coneflowers (Echinacea spp.)

Sturdy, daisy-like flowers on 2-4 foot stems. Colors range from purple and pink to orange, yellow, and white. They bloom mid-to-late summer, taking over as catmint’s first flush fades. Seedheads feed goldfinches in winter. ‘Magnus,’ ‘White Swan,’ and the Sombrero series are reliable.

Bee Balm (Monarda didyma)

Whorled, shaggy flowers in red, pink, purple, or white atop 3-4 foot stems. Blooms early summer, overlapping catmint. Hummingbirds love it. Choose mildew-resistant cultivars like ‘Jacob Cline’ (red), ‘Raspberry Wine’ (purple), or ‘Balmy Lilac’ (compact). Give it a bit more moisture than catmint if possible.

Yarrow (Achillea millefolium)

Flat-topped flower clusters on 2-3 foot stems. Ferny foliage contrasts catmint’s rounded leaves. Colors: yellow, white, pink, red, terracotta. ‘Moonshine’ (soft yellow) and ‘Terracotta’ (aging to rust) are standouts. Drought-tough, long-blooming, great for cutting. Divide every few years to maintain vigor.

Salvia (Salvia nemorosa and hybrids)

Dense spikes of blue, purple, pink, or white on 18-30 inch stems. Blooms late spring, reblooms if deadheaded. ‘Caradonna’ (dark stems, violet flowers) and ‘May Night’ (deep indigo) are garden classics. More compact than Russian sage, good for tighter spaces. Same cultural needs as catmint.

Black-Eyed Susan (Rudbeckia fulgida)

Golden-yellow daisies with dark centers on 2-3 foot stems. Blooms midsummer to fall, bridging catmint’s first and second flush. ‘Goldsturm’ is the standard; ‘American Gold Rush’ resists septoria leaf spot. Seedheads feed birds. Spreads steadily — edit as needed.

Blazing Star (Liatris spicata)

Vertical purple-pink bottlebrush spikes on 2-4 foot stems. Blooms top-down, unusual and striking. Grass-like foliage adds fine texture. Native, pollinator magnet, extremely drought-tolerant once established. ‘Kobold’ is compact; ‘Floristan Violet’ is taller. Plant in groups for impact.

Penstemon (Penstemon digitalis and hybrids)

Tubular flowers on 2-4 foot stems, late spring to early summer. White, pink, red, purple. ‘Husker Red’ has maroon foliage; ‘Dark Towers’ is similar but stronger. Native bees adore them. Sharp drainage is non-negotiable — wet winter soil kills them.

Ornamental Grasses: The Ultimate Backdrop

Grasses bring movement, light-catching seedheads, and winter structure. They’re the unsung heroes of the late-season garden. Most are clump-formers, not runners, so they stay polite.

Feather Reed Grass (Calamagrostis x acutiflora ‘Karl Foerster’)

The gold standard. Upright, wheat-like plumes rise 4-5 feet in early summer, turning gold by midsummer. Stays vertical all winter. Doesn’t flop. Doesn’t self-seed aggressively. Plant three or five behind catmint for a living screen that catches the light.

Switchgrass (Panicum virgatum)

Native, airy, cloud-like panicles in late summer. ‘Northwind’ is strictly upright, 5-6 feet, olive-green foliage. ‘Shenandoah’ turns deep red in fall, 3-4 feet. ‘Heavy Metal’ has metallic blue blades. All provide winter interest and bird habitat. Cut back in early spring.

Little Bluestem (Schizachyrium scoparium)

Shorter, 2-3 feet, but with incredible fall color — copper, orange, red. Fluffy white seedheads catch low autumn light. ‘The Blues’ has intense blue summer foliage. ‘Standing Ovation’ stays upright. Native, tough, beautiful in mass.

Fountain Grass (Pennisetum alopecuroides)

Arching mounds with bottlebrush plumes. ‘Hameln’ is compact, 2-3 feet. ‘Karley Rose’ has smoky pink plumes, 3-4 feet. Not as upright as the others — more fountain than column. Great for softening a corner. May self-seed in warm zones; choose sterile cultivars if concerned.

Miscanthus (Miscanthus sinensis)

Big, bold, 5-7 feet. ‘Morning Light’ has fine white-margined leaves, very graceful. ‘Gracillimus’ is the classic narrow-leaf form. ‘Strictus’ (porcupine grass) has horizontal gold bands. These need space. In small beds, they overwhelm. Check invasiveness in your region — some areas restrict miscanthus.

Shrubs and Small Trees for Permanent Structure

Perennials and grasses die back. Woody plants remain. A few well-placed shrubs give the bed bones in winter and a backdrop in summer.

Bluebeard (Caryopteris x clandonensis)

Technically a sub-shrub, dies back partially in cold zones. 2-3 feet tall, covered in blue flowers late summer to fall — exactly when catmint reblooms. ‘Dark Knight’ has deep blue flowers; ‘Sunshine Blue’ has gold foliage. Pollinator magnet. Cut back hard in spring.

Butterfly Bush (Buddleia davidii)

Archng 5-8 feet, fragrant flower spikes all summer. ‘Miss Molly’ (red-pink), ‘Lo & Behold’ series (compact, sterile), ‘Black Knight’ (deep purple). Invasive in some regions — check local rules. Sterile cultivars are safer. Butterflies flock to it.

Smokebush (Cotinus coggygria)

Grown for foliage and smoke-like seed plumes. ‘Royal Purple’ holds deep purple leaves all season. ‘Golden Spirit’ is chartreuse. ‘Winecraft Black’ is compact, 4-5 feet. Can be coppiced (cut to ground) in spring for lush foliage at catmint’s height, or left to grow tall.

Dwarf Conifers

For evergreen structure, try ‘Blue Star’ juniper (silvery blue, 2-3 feet), ‘Globosa’ blue spruce (round, 3-5 feet), or ‘Degroot’s Spire’ arborvitae (narrow column, 5-6 feet). They anchor the bed in winter and frame the catmint’s softness year-round.

Rose of Sharon (Hibiscus syriacus)

Upright vase shape, 8-12 feet, but easily pruned lower. Late summer flowers in white, pink, blue, purple. ‘Blue Chiffon,’ ‘Lil’ Kim’ (dwarf), ‘Sugar Tip’ (variegated leaves). Blooms when little else does. Can seed aggressively — deadhead or choose sterile varieties.

Annuals and Tender Perennials for Seasonal Punch

Perennials take time to bulk up. Annuals fill gaps fast. They also let you change the color scheme yearly.

Tall Verbena (Verbena bonariensis)

See-through magic. Wiry 4-5 foot stems topped with tiny purple clusters. Blooms all summer. Self-sows gently. Butterflies adore it. Plant it behind catmint — you’ll see through it to the catmint, but it adds a purple haze above. Not hardy north of zone 7, but returns from seed.

Cosmos (Cosmos bipinnatus)

Feathery foliage, daisy flowers in pink, white, magenta. 3-5 feet. ‘Sensation’ mix is classic. ‘Double Click’ has frilly doubles. Direct sow after frost. Deadhead for months of bloom. Stake early or let them lean casually.

Mexican Sunflower (Tithonia rotundifolia)

Bold, hot orange flowers on 4-6 foot sturdy stems. Velvety leaves. Loves heat. Monarchs love it. ‘Torch’ is the standard. ‘Goldfinger’ is shorter, 3-4 feet. Start seeds indoors 6 weeks before last frost. One packet fills a large space.

Cleome (Cleome hassleriana)

Spidery flowers in pink, white, purple. 3-5 feet. Interesting seedpods. Self-sows reliably. Thorny stems deter rabbits. ‘Senorita Rosalita’ is sterile, thornless, shorter — good for tight spots. Adds a tropical vibe.

Annual Salvias (Salvia farinacea, S. guaranitica)

Mealycup sage (S. farinacea) gives 2-3 feet of blue or white spikes all summer. ‘Victoria Blue’ is compact. Anise-scented sage (S. guaranitica) hits 4-5 feet with deep cobalt flowers and black calyces. ‘Black and Bloom’ is improved. Hummingbird favorites. Not hardy north of zone 8.

Planting Combinations: Real-World Recipes

Theory is nice. Recipes are better. Here are three proven combos for different bed sizes and styles.

Recipe 1: The Pollinator Powerhouse (8 ft deep, full sun)

Back row (5-6 ft): ‘Karl Foerster’ feather reed grass (3 plants, 24 in apart).
Middle row (3-4 ft): Russian sage ‘Denim ‘n Lace’ (3), coneflower ‘Magnus’ (3), blazing star ‘Kobold’ (5).
Front row (18-24 in): Catmint ‘Walker’s Low’ (5, 24 in apart), yarrow ‘Moonshine’ (3), salvia ‘Caradonna’ (5).
Why it works: Grasses for winter, perennials for summer color, staggered bloom, all drought-tough. Bees, butterflies, birds all served.

Recipe 2: The Cottage Garden Dream (6 ft deep, full sun)

Back row (4-5 ft): Butterfly bush ‘Lo & Behold Blue Chip’ (2), rose of Sharon ‘Lil’ Kim’ (1), tall verbena (scattered seed).
Middle row (2-3 ft): Bee balm ‘Jacob Cline’ (3), penstemon ‘Husker Red’ (5), black-eyed Susan ‘Goldsturm’ (3).
Front row (12-18 in): Catmint ‘Cat’s Pajamas’ (compact, 5), dwarf yarrow ‘New Vintage Rose’ (3), annual cosmos (direct sow).
Why it works: Shrubs for structure, hot and cool colors, self-sowers fill gaps, compact catmint fits tight space.

Recipe 3: The Modern Minimalist (5 ft deep, full sun)

Back row (4 ft): Switchgrass ‘Northwind’ (3, 30 in apart).
Middle row (3 ft): Russian sage ‘Little Spire’ (3), coneflower ‘White Swan’ (3).
Front row (18 in): Catmint ‘Walker’s Low’ (5), salvia ‘May Night’ (5).
Why it works: Limited palette (blue, white, tan), strong vertical lines, grass catches light, low maintenance, high elegance.

Common Mistakes to Avoid

Even experienced gardeners trip up. Here’s what not to do when planting behind catmint.

Planting Too Close

Catmint spreads. A 4-inch pot becomes a 3-foot mound. If you plant a coneflower 12 inches behind it, the coneflower gets swallowed. Space for mature width, not pot size. Use the plant tag’s spacing recommendation, then add 6 inches.

Choosing Shade-Lovers

Hostas, ferns, astilbes, heucheras — they look lovely in catalogs next to catmint. In your sunny bed, they fry. Match sun exposure exactly. If your bed gets afternoon shade only, catmint will be leggy and the shade plants may survive. But it’s a compromise.

Ignoring Bloom Gaps

If everything blooms in June, July is green. Plan for succession. Use a bloom calendar. Mark when each plant flowers. Aim for no more than two weeks without something showy. Grasses and seedheads count as “showy” in fall.

Overcrowding Aggressive Spreaders

Bee balm, obedient plant (physostegia), gooseneck loosestrife, some rudbeckias — they run. Catmint runs too. Two runners fighting makes a mess. Either choose clumpers or edit ruthlessly every spring. Don’t plant three aggressive spreaders together hoping they’ll “sort it out.”

Forgetting Winter Interest

A bed that’s bare November through March feels empty. Leave grasses standing. Keep coneflower seedheads. Choose shrubs with bark interest (red twig dogwood, paperbark maple). Catmint’s dead stems are messy — cut them back in late winter, but leave the rest.

Maintenance Tips for a Thriving Mixed Border

Low maintenance doesn’t mean no maintenance. A few timely tasks keep the border looking designed, not wild.

Spring Cutback

Cut catmint to 3-4 inches in early spring before new growth starts. Same for grasses — cut to 6 inches. Leave shrubs alone unless renovating. Remove dead perennial stems. This is the single most important task for neatness.

The Chelsea Chop

In late May (around the Chelsea Flower Show), cut back tall, late-blooming perennials by half — coneflowers, bee balm, sedum, goldenrod. They’ll bloom later, shorter, and bushier. Stagger the chop: half the plants now, half in two weeks. Extends the show.

Deadheading for Rebloom

Shear catmint by one-third after first flush. It reblooms in 3-4 weeks. Deadhead coneflowers, salvia, yarrow, coreopsis to prompt more flowers. Leave some seedheads for birds. It’s a balance.

Dividing and Editing

Every 3-4 years, dig and divide catmint, yarrow, bee balm, grasses. Spring or fall. Replant vigorous outer sections; compost the woody center. Edit self-sowers — keep the best, remove the rest. A crowded bed declines fast.

Mulching Wisely

Use 1-2 inches of shredded leaves, pine fines, or gravel. Keep mulch off crowns. Gravel suits catmint and its xeric companions — it reflects heat, improves drainage, discourages slugs. Organic mulch builds soil but holds moisture; pull it back from stems.

Adapting for Different Garden Conditions

Not every garden is flat, sunny, and well-drained. Here’s how to adjust.

Sloped Gardens

Catmint loves a slope — drainage is perfect. Plant behind it with deep-rooted natives: little bluestem, butterfly weed (asclepias), prairie dropseed. They hold soil. Stagger plants horizontally across the slope, not in vertical rows, to slow runoff.

Hot, Reflected Heat (Near Walls, Pavement)

South-facing walls bake plants. Choose the toughest: Russian sage, yarrow, sedum ‘Autumn Joy,’ feather reed grass, bluebeard. Water deeply at planting, then taper off. Gravel mulch helps. Avoid plants that wilt in heat (hydrangeas, ligularia).

Coastal Gardens (Salt, Wind, Sand)

Catmint handles salt spray decently. Good partners: rugosa rose, bayberry, switchgrass, yarrow, sedum, lavender, Russian sage. Avoid broadleaf evergreens that burn. Stake tall grasses their first year. Rinse foliage after storms if possible.

High Altitude / Short Season

Choose early-blooming, cold-hardy varieties. Catmint ‘Walker’s Low’ (zone 3), salvia ‘May Night’ (zone 4), feather reed grass (zone 4), coneflower ‘Magnus’ (zone 3), yarrow (zone 3). Start annuals indoors. Mulch heavily for winter protection.

Container Combinations: Catmint as Spiller

Catmint works in large pots (18+ inches) as a spiller. Behind it — in the pot’s center or back — plant a thriller.

Thriller Options for Pots

Dwarf conifers: ‘Blue Star’ juniper, ‘Globosa’ spruce. Evergreen structure.
Ornamental grass: ‘Karl Foerster’ (needs large pot), ‘Northwind’ switchgrass.
Tall annual: Verbena bonariensis, cleome, salvia ‘Black and Bloom’.
Tender perennial: Canna ‘Tropicana’ (bold leaves), purple fountain grass (annual in cold zones).

Filler Plants for the Middle

Between thriller and catmint spiller: calibrachoa, lantana, pentas, angelonia, dwarf zinnias. All take heat, bloom nonstop. Fertilize monthly. Water daily in summer. Overwinter pots in garage if plants are hardy; treat annuals as disposable.

Wildlife Benefits of a Catmint-Centered Border

A well-planned border behind catmint isn’t just pretty. It’s a habitat.

Pollinator Support Through the Seasons

Early: catmint, salvia, alliums, baptisia. Mid: bee balm, coneflower, yarrow, butterfly weed. Late: sedum, goldenrod, aster, Russian sage, grasses (pollen). Continuous nectar = healthy bees, butterflies, hoverflies, moths.

Bird Food and Shelter

Coneflower, rudbeckia, sunflower, grasses, switchgrass — seedheads feed finches, sparrows, juncos. Shrubs (viburnum, serviceberry, dogwood) add berries. Dense grasses give winter cover. Leave stems standing until March.

Beneficial Insects

Yarrow, dill, fennel, alyssum attract parasitic wasps, lady beetles, lacewings. They eat aphids, caterpillars. Catmint’s aroma may deter some pests. A diverse border balances itself.

Conclusion: Your Catmint Canvas Awaits

Knowing what to plant behind catmint opens a world of garden possibilities. Whether you crave a pollinator paradise, a modern grass-driven matrix, a cottage garden riot, or a low-water xeric scene — catmint plays well with all of them. The secret isn’t a magic plant list. It’s matching conditions, staggering blooms, contrasting textures, and planning for the long view — including winter.

Start with one combination. Watch it. Edit it. Add a grass here, a coneflower there. Gardens aren’t built in a weekend; they’re cultivated over seasons. Your catmint is ready for its co-stars. Go give it a supporting cast worthy of its talent.

Frequently Asked Questions

What are the lowest-maintenance plants to grow behind catmint?

Feather reed grass ‘Karl Foerster,’ Russian sage, yarrow ‘Moonshine,’ and coneflower ‘Magnus’ are exceptionally low-maintenance. They need no staking, minimal watering once established, no fertilizing, and only annual spring cutback. All resist pests, diseases, and deer.

Will catmint choke out plants behind it?

Catmint spreads horizontally but stays low (12-24 inches). It won’t choke tall plants behind it unless planted too close. Give companions 2-3 feet of clearance from catmint’s mature spread. Edit catmint runners annually if they encroach.

Can I plant lavender behind catmint?

Lavender is shorter than most catmint varieties (12-18 inches vs 18-24 inches), so it belongs in front of or beside catmint, not behind. If you want the lavender look taller, plant it on a berm or raised bed behind catmint, but ensure sharp drainage for both.

What plants bloom at the same time as catmint for a coordinated show?

Salvia ‘May Night,’ allium ‘Globemaster,’ baptisia, bearded iris, and early roses bloom with catmint’s late spring flush. For summer rebloom, pair with coneflower, bee balm, yarrow, and black-eyed Susan. Russian sage and ornamental grasses peak as catmint rests.

How do I prevent taller plants from flopping onto catmint?

Choose sturdy, upright varieties (coneflower ‘Magnus’ over ‘White Swan’). Use the Chelsea Chop in late May on late bloomers. Stake early with grow-through supports. Plant grasses like ‘Karl Foerster’ that never flop. Avoid over-fertilizing — lean soil makes stronger stems.

Can catmint grow in part shade with different companions?

Catmint gets leggy and blooms poorly in part shade. In 4-5 hours sun, try pairing with shade-tolerant but sun-accepting plants: Japanese anemone, hakone grass, heuchera, brunnera, and ferns. Accept fewer flowers; enjoy the foliage contrast instead.