Photo by Melody

PlantFiles: Lithodora
Lithodora diffusa

Family: Boraginaceae
Genus: Lithodora (lith-oh-DOR-uh) (Info)
Species: diffusa (dy-FEW-sa) (Info)

5 members have or want this plant for trade.

Alpines and Rock Gardens

6-12 in. (15-30 cm)

12-15 in. (30-38 cm)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Medium Blue

Bloom Time:
Late Spring/Early Summer
Mid Summer
Blooms repeatedly


Other details:
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)

Patent Information:

Propagation Methods:
From softwood cuttings
From seed; sow indoors before last frost

Seed Collecting:
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds

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There are a total of 9 photos.
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1 positive
1 neutral
No negatives

Gardeners' Notes:

Neutral suewylan On Nov 20, 2010, suewylan from North Fork, CA (Zone 7b) wrote:

This plant was not hardy in my Zone 7, garden with a bit of snow.

I saw 4 foot square drifts of it in NZ that were beautiful!

Positive apprentice On Jul 27, 2003, apprentice from Pismo Beach, CA wrote:

I was glad I went to this website when searching for a periennial ground cover. I planted approx. 6 Lithodora around an "island" in the corner of our front yard. Its green leaves and pretty, bright blue flowers added such an elegant appearance to that once-boring island. Thank you for the valuable info you provide, esp. for "apprentices" like myself. Will update my comments when they've been in the ground a whole year.


This plant has been said to grow in the following regions:

Brea, California
Dinuba, California
Kensington, California
Los Angeles, California
Snellville, Georgia
Winterville, Georgia
Woodstock, Georgia
Rotterdam, New York
Dallas, Oregon
Portland, Oregon
Salem, Oregon
Tunkhannock, Pennsylvania
Lake Forest Park, Washington

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