1 named cultivar
The Story
Plant Bio
Lithodora diffusa is a low evergreen sub-shrub from northwestern France and southwestern Europe, six to twelve inches high and spreading two feet or considerably more. Trailing stems carry small dark green bristly leaves, and the flowers are the reason to grow it: a deep, almost gentian blue, funnel-shaped, carried in profusion from May into June.
The blue is as intense as almost anything in the garden, and it depends on acidic soil; in alkaline ground the leaves yellow and the plant declines steadily. Test the soil before buying, and if it is limy, grow it in an ericaceous container instead, where it trails handsomely over the edge.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Groundcover
Height
6 inches
Width
36 inches
Light
Full Sun, Partial Sun
Zones
6, 7, 8, 9
Water
Medium
Humidity
Average
Lifespan
Perennial
Native To
Northwestern France to southwestern Europe
Toxicity
Non-toxic
Planting
How to Grow
- Test the soil pH before planting; it must be acidic.
- Plant in spring in humus-rich, moist, very well-drained soil.
- Site in full sun, or part shade where summers are hot.
- Water regularly without letting the soil stay wet.
- Trim lightly after flowering to keep the mat dense.
- Use ericaceous compost in a container on limy ground.
Pro Tip
Yellowing leaves mean the soil is too alkaline, not underfed; feeding a lime-stressed plant makes no difference at all.
Keep It Thriving
Care Guide
Do
- Give it acidic, humus-rich, sharply drained soil 🌱
- Grow it in a container if your soil is limy 🪴
- Trim lightly after flowering ✂️
- Let it spill over walls and raised beds 🧱
Don't
- Plant it in alkaline soil ❌
- Let it sit in wet ground ❌
- Feed a yellowing plant instead of correcting the pH ❌
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Check | ||||||||||||
| Trim |
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
Lithodora questions
What zones can Lithodora grow in?
Lithodora is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Lithodora deer resistant?
Yes — Lithodora is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Lithodora bloom?
Lithodora typically blooms in late spring to early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Lithodora need full sun?
Lithodora does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Lithodora drought tolerant?
Yes — once established (usually after the first full season), Lithodora handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Lithodora to compare
Keep exploring
Explore the genus
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Grow Lithodora 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.