How to Grow Japanese Catmint
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Japanese Catmint
Nepeta subsessilis
flowerJapanese catmint is a compact, herbaceous perennial that produces spikes of violet-blue flowers held above aromatic, softly hairy foliage. This non-invasive catmint cultivar is prized for its refined appearance and extended blooming period, making it ideal for borders, cottage gardens, and pollinator landscapes.
When should you plant Japanese Catmint in your zone?
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Example Japanese Catmint timeline · Pittsburgh, PA (Zone 6b)
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Plant Japanese Catmint
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Japanese Catmint blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Japanese Catmint dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 4-8; thrives in temperate climates with moderate summer heat
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Establishment
3-4 weeksYoung transplant or seedling with emerging true leaves and developing root system
Water consistently to establish roots. Protect from strong winds. Apply 1-2 inches of mulch around base, keeping clear of crown to prevent rot.
Vegetative Growth
4-6 weeksDense mounding growth with multiple stems producing opposite, serrated, aromatic leaves; no flowers yet
Pinch stem tips in early season to encourage branching and bushier form. Maintain consistent moisture. Begin weekly fertilizing if growing in lean soil.
Flowering
6-10 weeks (typically June-September)Tall spikes of tubular, violet-blue flowers emerge above foliage in dense, showy inflorescences
Deadhead spent flowers to encourage continuous blooming. Provide weekly watering during dry periods. Stake taller stems if needed in exposed locations.
Late Season & Dormancy
October-MarchFlowering diminishes as temperatures cool; foliage may fade or persist depending on climate
Reduce watering as growth slows. Cut back stems to 4-6 inches in late fall or early spring after last frost. Do not fertilize in late season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil on leaf undersides. Encourage beneficial insects like ladybugs. Remove heavily infested leaves.
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Ensure excellent drainage; avoid overwatering. Remove infected plants. Improve air circulation around planting area.
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Space plants for air flow. Spray with sulfur dust or fungicide if severe. Remove affected leaves. Water at soil level, not overhead.
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and
Use garden netting or fencing if cats are problematic. Reapply cat deterrents or motion-activated sprinklers as needed.
Uses
Herbal Tea & Flavoring
CulinaryJapanese catmint leaves can be dried and brewed into a mild, aromatic tea with subtle citrusy notes. Fresh or dried leaves also add gentle flavor to salads and beverages. [source]
Traditional Herbal Remedy
MedicinalCatmint species have long been used in folk medicine to support relaxation and digestive comfort. Contains volatile oils with potential calming properties. [source]
Pollinator Magnet
WildlifeProlific nectar and pollen source for bees, butterflies, and hoverflies. Significantly attracts beneficial insects that support garden pollination and pest control. [source]
Ornamental Display & Cut Flowers
HouseholdElegant spires of blue-violet flowers make exceptional additions to fresh bouquets and dried arrangements. Compact growth habit suits borders, containers, and pollinator gardens. [source]
Dried Flower & Arrangement Material
CraftFlower spikes dry well and retain color, making them ideal for dried arrangements, wreaths, and craft projects. Aromatic dried material also works in potpourri. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
This ornamental is primarily grown for flowers and foliage, not harvested in the traditional sense. Cut flowers last 5-7 days in a vase. Harvest fresh aerial portions (leaves and stems) in early morning just before flowering if desired for herbal use. Deadhead spent flowers regularly throughout the season to promote continuous blooming and extend the display.
Fun Facts
- 🌱 Nepeta subsessilis is notably non-invasive, unlike some aggressive Nepeta cataria relatives, making it safer for ornamental garden use without risk of spreading.
- 🌱 Japanese catmint earned Royal Horticultural Society Garden Merit recognition for its superior ornamental and garden performance in temperate climates.
- 🌱 The plant's aromatic foliage contains volatile oils that repel certain insect pests while simultaneously attracting pollinators, making it a natural pest-management ally.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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