Catmint vs Lavender: Which Purple Perennial Needs Less Water?
Two Purple Perennials, One Water Challenge
Catmint and lavender look similar from a distance: silvery-green foliage, purple flower spikes, a preference for sun and lean soil. Garden centers often shelve them side by side, and gardeners routinely reach for whichever is cheaper and in bloom. But when water conservation matters—whether from drought, a busy schedule, or a desire to garden without a hose—the differences between Nepeta and Lavandula become critical.
This guide covers every meaningful difference: drought mechanism, hardiness zones, soil demands, bloom season, and the conditions that make one plant thrive while the other fails.
Quick Comparison
| Feature | Catmint (Nepeta) | Lavender (Lavandula) |
|---|---|---|
| Mature height | 12–36 in | 12–36 in |
| Spread | 18–36 in | 18–24 in |
| Light | Full sun to part shade | Full sun only |
| Water needs | Low | Very low |
| Drainage required | Good | Excellent (non-negotiable) |
| Difficulty | Easy | Moderate |
| USDA zones | 3–8 | 5–9 (English); 7–10 (Spanish) |
| Deer resistant | Yes | Yes |
| Typical plant cost | $5–$12 | $8–$20 |
What Is Catmint?
Catmint is the common name for Nepeta, a genus of roughly 250 species in the mint family (Lamiaceae). The species grown most widely in North American gardens is Nepeta × faassenii, a sterile hybrid prized for continuous flower production from late spring through fall. Because Nepeta × faassenii produces no viable seed, it stays where it is planted and spreads only by the root system—making it a tidy, non-invasive choice for borders and edges.
The name “catmint” reflects the mild but real attraction the plant holds for cats—less intoxicating than catnip (Nepeta cataria), but enough to cause rolling in young plantings. The small, grayish-green leaves produce a pleasant herbal scent when brushed or crushed. Popular cultivars include ‘Walker’s Low’ (24–36 in, vigorous rebloom), ‘Junior Walker’ (12–18 in, compact), and ‘Six Hills Giant’ (3 ft+, best for back borders).
NC State Cooperative Extension rates Nepeta × faassenii as “drought tolerant once established” with reliable performance across USDA zones 3–8. This broad cold hardiness is one of catmint’s strongest competitive advantages over lavender.
What Is Lavender?
Lavender (Lavandula) is a genus of 47 species native to the Mediterranean basin, the Middle East, and India. In most of North America, the dominant garden species is Lavandula angustifolia—known as English lavender despite being native to the western Mediterranean mountains. English lavender is the hardiest species (USDA zones 5–9) and the primary source of culinary lavender and high-grade essential oil.
Spanish lavender (Lavandula stoechas) is popular in zones 7–10 for its distinctive pineapple-topped flower heads, but it lacks the fragrance intensity of English lavender and is significantly less cold-hardy. French lavender (Lavandula dentata) is grown primarily in zones 8–11 and is rarely seen in northern gardens.
Lavender is technically a sub-shrub: the woody base persists through winter while new growth emerges from it each spring. The silver-gray leaf hairs—botanically called trichomes—reflect sunlight and reduce water loss, adaptations that reflect the plant’s Mediterranean origin in regions with near-zero summer rainfall.
Water Requirements: The Key Difference
Both catmint and lavender are marketed as drought tolerant. Both are, technically. But they tolerate drought in fundamentally different ways, and the difference matters for practical garden decisions.
How Catmint Handles Drought
Catmint relies on a lateral fibrous root system that spreads outward to intercept surface rainfall and moisture across a wide footprint. When soil moisture drops sharply, established plants enter mild semi-dormancy: growth slows and the mound may look slightly wilted by late afternoon. But unlike lavender, catmint tolerates brief waterlogging—it recovers quickly once water returns.
Established plants in USDA zones 3–8 typically need no supplemental watering once natural rainfall delivers roughly 1 inch per week. During dry spells, catmint shows visible stress after 2–3 weeks without water but rebounds reliably once conditions improve. If you are building a low-water garden, catmint pairs well with other drought-adapted perennials—see our roundup of 15 Drought-Tolerant Flowers That Thrive Without Constant Watering for compatible companions.
How Lavender Handles Drought
Lavender’s drought tolerance is more extreme but less flexible. The taproot extends 18–24 inches into well-drained subsoil, accessing deep moisture reserves that catmint’s surface roots cannot reach. The RHS notes that established lavender “rarely needs watering except in prolonged drought” and recommends “watering sparingly” even during establishment to encourage deep root development—plants watered too frequently develop shallow roots and become more drought-sensitive over time.
But lavender’s drought tolerance comes with a non-negotiable condition: perfect drainage. Lavender evolved on rocky Mediterranean hillsides where water drains away within minutes of a rainfall event. Standing water, compacted soil, or clay that retains moisture between rainfall events triggers Phytophthora root rot, and affected plants rarely recover. This requirement means lavender can paradoxically demand more active soil management than catmint in most American garden conditions.
The Verdict on Water
Lavender is the more drought-tolerant plant when site conditions are ideal—full sun, excellent drainage, alkaline-to-neutral soil, low humidity. But catmint is the more reliably low-water plant across a broader range of garden conditions because it tolerates clay soil, part shade, and higher humidity without dying. For gardeners east of the Rockies, or in humid climates like the Mid-Atlantic, Southeast, or Pacific Northwest, catmint will almost always be the lower-maintenance choice.
Growth Habit and Size
Catmint is a true herbaceous perennial: it dies completely to the ground each fall and regenerates from the root crown each spring. This annual cycle prevents the woody dieback issues that affect aging lavender plants. Common cultivars form a rounded mound 12–24 inches tall and 18–36 inches wide. Shearing back by one-third after the first bloom flush promotes a dense second and third flowering and keeps plants compact through the season.
Lavender is a sub-shrub: the woody base accumulates year over year. Without annual pruning, older lavender becomes woody, open in the center, and prone to splitting at the base. The RHS recommends pruning lavender immediately after flowering each year—cutting back to soft growth just above the woody structure, never into old wood. English lavender varieties like ‘Hidcote’ and ‘Munstead’ stay compact at 15–18 inches; ‘Grosso’ (a lavandin hybrid) grows to 24–30 inches and is used commercially for essential oil production.
Bloom Season and Appearance
Catmint has the longer bloom season of the two. In zones 5–7, the first flush begins in May, and plants can continue producing flowers through October if cut back after each flush. The individual flowers are small, tubular, and lavender-blue to violet, carried in loose spikes above the foliage. The overall effect is airy and cottage-garden informal. The soft mound of gray-green foliage remains attractive even between bloom flushes.
Lavender blooms from late spring to midsummer. English lavender peaks in June and July in zones 5–7; lavandin hybrids bloom slightly later, in July and August. The flowers are tight, erect, intensely fragrant wands on long stems—more architectural than catmint’s looser form. Lavender’s fragrance is its defining advantage: complex, distinctive, and far more intense than catmint’s mild herbal scent. If you want to cut flowers for sachets, dried arrangements, or culinary use, lavender is the clear choice.
Soil and Site Requirements
Catmint accepts a wide range of soil conditions. It performs best in well-drained, average-to-poor soil with pH 6.0–7.5, but it tolerates clay soils and occasional wet periods that would kill lavender outright. Part shade (3–6 hours of direct sun) is workable, though flowering is more sparse than in full sun. These tolerances explain catmint’s reputation as a low-maintenance, adaptable border plant in climates lavender finds difficult.
Lavender’s site requirements are rigid. It needs full sun (minimum 6 hours, ideally 8+), near-perfect drainage, and soil pH of 6.5–8.0. In clay-heavy soil, the standard approach is to build a raised bed and incorporate 30–50% coarse grit or fine gravel into the planting mix. Gravel mulch around the base of plants improves surface drainage and reduces humidity at the crown. In humid climates where relative humidity consistently exceeds 60–70% in summer, even correctly drained lavender can develop fungal crown rot over time.
Hardiness Zones and Cold Tolerance
This is the most significant practical difference for gardeners in the northern US and Canada. Catmint (Nepeta × faassenii) is rated hardy to USDA zone 3, tolerating winter temperatures to −40°F (−40°C)—covering most of Canada, the Dakotas, Minnesota, Montana, and northern New England. Lavandula angustifolia is hardy to zone 5, with a lower limit of −20°F (−29°C). Spanish lavender tops out at zone 7.
If you garden in zones 3 or 4, catmint is not a preference—it is the only viable option of the two. In zones 5–6, both survive winter, but English lavender benefits from excellent drainage and some wind protection. In zones 7–9, both thrive under average conditions.
Uses in the Garden
Both plants attract bees, butterflies, and hoverflies in large numbers. The practical uses differ primarily because of their different growth forms.
Catmint excels as path edging, ground cover on slopes, and a filler between roses. The traditional English practice of underplanting roses with catmint remains popular because the two bloom simultaneously in June, neither competes aggressively for resources, and catmint’s silver foliage complements rose colors across the spectrum. It also works well in large containers. For more on what grows well alongside lavender in a mixed border, the guide to Lavender Companion Plants: 15 Best Flowers to Grow with Lavender covers reliable options for both plants.
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→ View My Garden CalendarLavender’s upright, structured form suits formal herb gardens, low hedges, Mediterranean-style plantings, and gravel gardens. The harvestable, fragrant flowers justify planting it near seating areas, window boxes, and entryways. Cut for drying before the flowers fully open; they retain fragrance for months in sachets and dried arrangements.
Deer and Pest Resistance
Both catmint and lavender are strongly deer-resistant—the aromatic oils in their foliage repel browsing deer reliably. Neither plant appears frequently in deer-damage surveys, making them both solid choices for gardens with high deer pressure. For a wider selection of deer-resistant flowering perennials that pair well with either plant, see our list of 20 Deer-Resistant Flowers for a Beautiful Untouched Garden.
Pest pressure on both plants is minimal. Catmint occasionally attracts aphids on tender spring growth, but predatory insects generally keep populations in check without intervention. Lavender’s primary threat is not insects but fungal disease triggered by overwatering, poor drainage, or insufficient air circulation.
Which Should You Choose?
| Choose catmint if… | Choose lavender if… |
|---|---|
| You garden in USDA zones 3–4 | You have excellent drainage and full sun |
| Your soil is clay-heavy or poorly drained | You want harvestable, fragrant flowers for sachets or cooking |
| Your climate is humid (Southeast, Mid-Atlantic, Pacific NW) | You garden in a dry climate (Mountain West, California) |
| You want a plant that forgives neglect and wet spells | You are designing a formal herb garden or Mediterranean border |
| You need a long-blooming edger or ground cover | Fragrance near seating areas or entryways is a priority |
| Budget is a priority | You want a long-lived sub-shrub with sculptural winter presence |
In USDA zones 5–7 with good drainage, catmint and lavender make excellent companions. They share the same light requirements and basic soil needs, bloom simultaneously in early summer, and complement each other’s form—catmint’s soft sprawl against lavender’s upright spikes—for a long season of purple in the garden.
Frequently Asked Questions
Is catmint the same as lavender?
No. Catmint (Nepeta) and lavender (Lavandula) are different plant genera in the same family (Lamiaceae). They share blue-purple flower color, gray-green aromatic foliage, and a preference for full sun and well-drained soil, but differ in cold hardiness, root structure, drought mechanism, soil flexibility, fragrance intensity, and bloom period.
Can catmint and lavender be planted together?
Yes, they make excellent companions in zones 5–7 with good drainage. Both prefer full sun and low water once established. Plant catmint to spill over the front of a border and lavender behind for contrast in form and height.
Which blooms longer, catmint or lavender?
Catmint. When sheared back after each bloom flush, catmint reblooms 2–3 times from late spring through early fall. Lavender typically has one main bloom period in late spring to midsummer, though prompt deadheading can extend it modestly.
Does catmint spread invasively?
Common garden catmint (Nepeta × faassenii) is a sterile hybrid that does not spread by seed. It expands by the root system over several years, forming wider clumps, but is not considered invasive in most regions. Catnip (Nepeta cataria) self-seeds prolifically—these are different plants.
Which is harder to grow, catmint or lavender?
Lavender requires more careful site preparation: excellent drainage is non-negotiable, and clay soil or humid climates create real management challenges. Catmint tolerates a much wider range of soil types and climatic conditions and is generally considered the easier plant for beginners.
