Species
Isotoma axillarisBlue Star Flower1 other cultivar
The Story
Plant Bio
Isotoma fluviatilis is a low-growing, spreading perennial that forms a lush green mat, ideal for ground cover between stepping stones.
Features a profusion of small, star-shaped, pale blue flowers from spring to fall.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Groundcover
Height
3 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8, 9, 10
Water
Moderate
Humidity
Prefers moderate humidity
Lifespan
Perennial
Native To
Australia
Toxicity
Toxic; can cause skin irritation and is poisonous if ingested.
Bloom period
Mid-spring – Late spring
In flower about 2 months of the year
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds into well-drained soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and encourage rooting.
- Plant in a location with full sun to partial shade for optimal growth.
- Water consistently but avoid waterlogging to prevent root rot.
- Apply a balanced fertilizer monthly during the growing season.
- Divide mature plants in early spring or fall to promote healthy growth.
Pro Tip
Use a well-draining soil mix and keep soil moist for vigorous growth.
Keep It Thriving
Care Guide
Do
- Water regularly during dry spells 🌱
- Mulch to retain soil moisture
- Prune lightly to shape and encourage dense growth
- Fertilize monthly during active growth
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t plant in heavy, poorly-draining soil
- Refrain from excessive fertilization which can cause legginess
- Avoid direct, harsh midday sun in extremely hot climates
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Fertilize | ||||||||||||
| Plant | ||||||||||||
| Prune | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Multiply
Propagation Methods
Good to Know
Common Questions
Blue Star Creeper questions
What zones can Blue Star Creeper grow in?
Blue Star Creeper is hardy in USDA Zones 5–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Blue Star Creeper deer resistant?
Yes — Blue Star Creeper is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Blue Star Creeper bloom?
Blue Star Creeper typically blooms in mid-spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Blue Star Creeper need full sun?
Blue Star Creeper does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Isotoma to compare
Keep exploring
Explore the genus
Grow Blue Star Creeper 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.