Also known as Mountain Mint · 399 saves
Pycnanthemum
Pycnanthemum, the genus most gardeners know as mountain mint. We track 5 varieties; the ones most used by real gardeners.
The 5 most-saved Pycnanthemum varieties
3 species of Pycnanthemum
Each one is a parent of the varieties above.
Track your Pycnanthemum in Sow
Save the Pycnanthemum you grow and get care reminders timed to your zone.
How to grow Pycnanthemum
Whats common across all Pycnanthemum varieties in our catalog — drawn from the care records of the 5 most-grown of them.
The Pycnanthemum year
- DivideMarch, April and September100% of varieties
Divide clumps every 3-4 years to maintain vigor and manage spread.
- HarvestMay–August100% of varieties
Harvest foliage before flowering for best spearmint flavor.
- PruneMay80% of varieties
Cut back stems by one-third in late spring for bushier plants and delayed bloom.
Do
- Provide good air circulation to prevent fungal issues
- Mulch to conserve moisture and suppress weeds
- Water regularly during dry spells 🌱
- Prune after flowering to promote new growth
- Use organic compost to enrich soil
Avoid
- Avoid overwatering to prevent root rot ❌
- Don’t use chemical fertilizers excessively
- Do not neglect pruning to maintain shape
- Overwater to avoid root rot ❌
What goes wrong with Pycnanthemum
| Problem | What you'll see | What to do |
|---|---|---|
| Aphids | Sticky residue and distorted leaves | Spray with insecticidal soap or neem oil |
| Spider mites | Fine webbing on foliage | Use horticultural oil or miticides |
| Powdery Mildew | White powder on leaves | Improve air circulation and apply organic fungicide |
| Powdery mildew | White powder on leaves | Improve air circulation and apply organic fungicide |
Making more Pycnanthemum
Seed
- Tuck seeds into moist soil in early spring
- Keep soil consistently moist for 2-3 weeks
- Thin seedlings to 12-18 inches apart
Cuttings
- Select healthy stems in late spring
- Dip cuttings in rooting hormone
- Place in moist soil or water for 4-6 weeks
Pycnanthemum questions
How many types of Pycnanthemum are there?
The Sow catalog tracks 5 distinct Pycnanthemum varieties. The most popular — ranked by 399 real gardeners — are shown first above.
What zones does Pycnanthemum grow in?
Across its varieties, Pycnanthemum covers USDA Zones 4–9. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Pycnanthemum bloom?
Most Pycnanthemum varieties bloom in mid to late summer, late summer, mid-summer. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Pycnanthemum should I choose?
Start from the most-saved varieties above — popularity across thousands of gardens is a strong signal of reliability — then filter by your zone and sun. In the Sow app you can preview any of them in a photo of your actual yard before you buy.