1 named cultivar
The Story
Plant Bio
Tweedia caerulea, commonly known as Blue Milkweed, is a sprawling perennial shrub with lance-shaped green leaves and clusters of star-shaped, sky-blue flowers that bloom in summer, attracting pollinators.
This species is notable for its drought tolerance and ability to thrive in well-drained soils, making it an excellent choice for xeriscaping and low-maintenance gardens.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
12 inches
Width
8 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8, 9
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
South America
Toxicity
Non-toxic to humans and pets
Planting
How to Grow
- Tuck seeds into moist soil in early spring
- Keep soil consistently moist during germination
- Transplant seedlings when they are 3 inches tall
- Provide support for vining growth
- Water regularly during dry periods
- Fertilize monthly with balanced fertilizer
Pro Tip
Use well-draining loam soil for best growth and avoid overwatering.
Keep It Thriving
Care Guide
Do
- Water deeply during dry spells 🌱
- Prune back after flowering to encourage bushier growth
- Provide support for vines
Don't
- Avoid overwatering which can cause root rot ❌
- Do not fertilize with high nitrogen fertilizers
- Never let soil stay waterlogged
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Harvest | ||||||||||||
| Plant | ||||||||||||
| Stake |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Blue Tweedia questions
What zones can Blue Tweedia grow in?
Blue Tweedia is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Blue Tweedia deer resistant?
Not reliably. Deer may browse Blue Tweedia, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Blue Tweedia bloom?
Blue Tweedia typically blooms in late spring through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Blue Tweedia need full sun?
Blue Tweedia does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Blue Tweedia drought tolerant?
Yes — once established (usually after the first full season), Blue Tweedia handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Tweedia to compare
Keep exploring
Explore the genus
Hardy in your zone?
Grow Blue Tweedia with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.