Short-stalked catmint (Nepeta subsessilis)
Nepeta subsessilis, Short-stalked catmint, offers showy violet-blue flowers from May to September. A low-maintenance perennial for zones 4-8.
Complete Plant Information
Overview
Short-stalked catmint, Nepeta subsessilis, is a valuable herbaceous perennial highly appreciated for its extended bloom period and striking flower color. Unlike some of its drought-tolerant cousins, this species thrives best with consistent moisture, making it an excellent candidate for wetter areas in the landscape. Gardeners are drawn to its tidy mounding habit and the dense spikes of bell-shaped, violet-blue flowers that appear reliably from late spring through early fall.
This Japanese native offers low maintenance once established, fitting well into borders or naturalized settings where reliable summer color is desired. While it shares the aromatic foliage characteristic of the genus, its specific cultural needs—preferring cooler, moister conditions—set it apart from the typical dry-soil-loving catmints. Incorporate Nepeta subsessilis where you need reliable structure and vibrant, long-lasting floral impact.
Fast Facts
- Plant Family: Lamiaceae
- Plant Type: Herbaceous perennial
- Native Range: Japan
- Hardiness Zones: USDA Zones 4-8
- Size at Maturity:
- Height: 1.5-2 ft
- Spread: 1-1.5 ft
- Bloom Time: May to September
- Bloom Description: Violet-blue
- Sun Exposure: Full sun to part shade
- Water Needs: Medium
- Maintenance Level: Low
How to Grow
Plant Nepeta subsessilis in average, well-drained soils. Although it tolerates a range of conditions, this specific species performs best when moisture levels are medium and consistent, especially compared to other catmints which are highly drought tolerant. For gardeners in northern regions, full sun locations are ideal to maximize vigor and blooming.
For Southern gardeners, strategically site Short-stalked catmint where it can receive light afternoon shade to prevent stress during the hottest parts of the day. Watering should be consistent; avoid letting the soil dry out completely, particularly during peak summer heat. Fertilization is usually unnecessary, as rich soil can encourage excessive foliage growth at the expense of blooms.
Maintenance for Nepeta subsessilis is generally simple. To encourage a more compact shape and potentially prompt a second flush before the main summer display, plants may be pruned back moderately before they begin their initial flowering cycle. Shearing the spent flower spikes immediately after the first major wave of blossoms will significantly promote continued blooming throughout the season.
Landscape Uses
The reliability and attractive floral display of Short-stalked catmint make it extremely versatile in designed landscapes. Its upright structure and medium height suit it perfectly for softening the front edges of perennial borders, providing excellent color contrast against foliage plants. Due to its medium water needs, it is an outstanding choice for rain gardens, absorbing excess runoff while delivering continuous flowers.
Consider using Nepeta subsessilis in informal groupings or naturalized plantings where it can mingle with other moisture-loving perennials. It also integrates well into herb gardens, although its primary purpose is ornamental. When selecting companions, look for plants that share similar sun and moisture requirements for the best overall results.
Standout Features
Flower Qualities
- Showy
Noteworthy Characteristics
Nepeta subsessilis typically grows in a mound to 2-3’ tall. Showy spikes of bell-shaped, deep violet-blue flowers (to 2” long) with maroon spots bloom in dense false whorls atop square, leafy stems clad with aromatic, toothed, green foliage. This species features a long summer bloom period. Although Nepeta cataria is the true catnip which house cats love, the leaves of this species are also attractive, albeit it less so, to cats. The genus name honors the ancient city of Nepete in Etruria.
Tolerances
- Deer
- Drought
- Dry Soil
- Shallow-Rocky Soil
Potential Problems
This species generally exhibits excellent resistance to serious insect or disease problems. Gardeners can feel confident planting Nepeta subsessilis without anticipating major chemical interventions. The key cultural consideration is providing adequate moisture; inconsistent watering or prolonged drought stress, especially in hot climates, can weaken the plant, potentially making it more susceptible to opportunistic pests or fungal issues.
Frequently Asked Questions
What hardiness zones is Short-stalked catmint suitable for?
Nepeta subsessilis is hardy across USDA Zones 4 through 8, offering reliability across a wide climatic range.
How large does Nepeta subsessilis grow?
This herbaceous perennial typically reaches a height between 1.5 and 2 feet tall with a spread ranging from 1 to 1.5 feet wide, usually forming a tidy mound.
When does Short-stalked catmint bloom?
You can expect continuous bloom from this variety starting in May and extending through September, displaying attractive violet-blue flowers.
What sun exposure does Nepeta subsessilis need?
The optimal light requirement for Nepeta subsessilis is full sun to part shade; ensure plants in hotter climates receive some afternoon shade.
Conclusion
Nepeta subsessilis offers gardeners a robust, low-maintenance perennial prized for its exceptionally long season of violet-blue flowers. Its mound-forming habit and deer resistance make Short-stalked catmint an indispensable edging or massing plant. Before planting, confirm your local climate falls within USDA Zones 4-8 and plan to situate it where it receives consistent, medium moisture.
Companion Planting
Selecting appropriate companions ensures that Nepeta subsessilis thrives throughout the season. Look for other perennials that enjoy similar moisture levels and sun exposure, avoiding plants that require extremely dry conditions. Excellent companions include Astilbe, Cimicifuga (Actaea), and certain varieties of ornamental grasses that tolerate partial shade and consistent moisture. Grouping these plants creates a cohesive textural tapestry in your perennial beds.
Design Ideas
Because of its ability to thrive in rain gardens, Nepeta subsessilis provides excellent textural contrast below taller, moisture-loving shrubs or grasses. For more formal settings, plant it in repeated drifts along a walkway; the fragrance released when brushed is an added sensory pleasure. The upright, square stems and toothed foliage offer structure even when the plant is not in peak bloom.
