Also known as Blue Milkweed · 344 saves
Tweedia
Tweedia, the genus most gardeners know as blue milkweed. We track 3 varieties; the ones most used by real gardeners.
The 3 most-saved Tweedia varieties
Species of Tweedia
Each one is a parent of the varieties above.
Track your Tweedia in Sow
Save the Tweedia you grow and get care reminders timed to your zone.
How to grow Tweedia
Whats common across all Tweedia varieties in our catalog — drawn from the care records of the 3 most-grown of them.
The Tweedia year
- PlantMarch67% of varieties
Plant transplants or sow seeds after the danger of hard frost has passed
- DeadheadJune–August67% of varieties
Remove spent blooms or harvest flowers regularly to prolong flowering
- Winter PrepOctober and November67% of varieties
Apply a thick layer of mulch around the crown for winter root protection
- StakeMay67% of varieties
Provide a small trellis or stakes for support as stems begin to elongate.
Do
- Water regularly during dry periods 🌱
- Prune after flowering to shape the vine
- Use balanced fertilizer in spring
- Water consistently during dry spells 🌱
- Provide full sun for best flowering
Avoid
- Avoid overwatering to prevent root rot ❌
- Don’t let soil stay waterlogged
- Never prune in late fall
- Do not plant in heavy, waterlogged soils
What goes wrong with Tweedia
| Problem | What you'll see | What to do |
|---|---|---|
| Aphids | Sticky residue and distorted leaves | Spray with insecticidal soap |
| Root rot | Wilting and blackened roots | Improve drainage and reduce watering |
Making more Tweedia
Cuttings
- Take 4-inch cuttings in late spring.
- Dip in rooting hormone and plant in moist soil.
- Maintain humidity for 6 weeks until roots develop.
Seed
- Tuck seeds into moist soil in early spring.
- Keep soil consistently moist for germination (2-3 weeks).
Tweedia questions
How many types of Tweedia are there?
The Sow catalog tracks 3 distinct Tweedia varieties. The most popular — ranked by 344 real gardeners — are shown first above.
What zones does Tweedia grow in?
Across its varieties, Tweedia covers USDA Zones 5–10. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Tweedia bloom?
Most Tweedia varieties bloom in late spring, summer to fall, mid-summer. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Tweedia 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.