Photo by Melody

PlantFiles: Lithodora
Lithodora diffusa 'Heavenly Blue'

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

13 members have or want this plant for trade.

Alpines and Rock Gardens

under 6 in. (15 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:
Unknown - Tell us

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

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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There are a total of 10 photos.
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3 positives
2 neutrals
No negatives

Gardeners' Notes:

Neutral bendipa On Jun 6, 2012, bendipa from London
United Kingdom wrote:

I had a similar problem. It can be a difficult plant to grow. The soil must be well drained and acidic . Lithodora Diffusa hates lime. If you live in a hard water area, watering will add lime to the soil (raises pH).The pH will become too high so.the plant will suffer..You either need to plant in ericaceous compost to begin with, or add some sulphur to the planting mixture whiich will keep the soil acidic enough. To ensure the soil drainage is sufficient add plenty of sharp sand/grit to the planting area.

Neutral altura On May 19, 2012, altura from Bluffton, SC wrote:

I live in Bluffton, SC and bought 6 of these plants at Home Depot in April. They were gorgeous and I was so proud after getting them in the ground. In about 2 wks, one plant started to turn black and I was so sad. Eventually it died but before it died, a second one followed suit. I read here to cut out the die back which I have on the remaining 4, 3 of which look good but the 4th is half gone. I don't think I have overwatered. Should I give up or replace with new ones? Help!! Mary Ann

Positive kkitchener On Sep 5, 2008, kkitchener from Moclips, WA (Zone 8a) wrote:

I am are just feet from the Pacific Ocean - Wind and Salt Air! Lithodora is one of my staples. It is reliable and very pretty. Depending on how the wind hits it, it may "burn" or get ugly, I just whack off the ugly part off and it grows back and rewards me with pretty blooms all summer long.

Positive trothatl On May 2, 2006, trothatl from Decatur, GA wrote:

In the Atlanta area, the plants are filled with beautiful blue flowers in April. The center of my plants have browned out a bit, but I'm told I can prune the plants back this fall and they will be fine next year. They seem to be hardy and grew quickly this spring.

Positive Zanymuse On Apr 22, 2003, Zanymuse from Scotia, CA (Zone 9b) wrote:

Low growing, spreading plant, that has a beautiful blue color that really stands out in spite of the small size of the flowers. Likes free draining soil but tolerates our wet winters and frequent light to medium frosts. Grew fastest here in full sun but did ok in partial shade also.


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

Auburn, Alabama
Centre, Alabama
Brea, California
Camarillo, California
Carlotta, California
Decatur, Georgia
Snellville, Georgia
Chilmark, Massachusetts
Jamaica Plain, Massachusetts
Elizabeth City, North Carolina
Lake Toxaway, North Carolina
Vass, North Carolina
Eugene, Oregon
Portland, Oregon
Wilkes Barre, Pennsylvania
Maryville, Tennessee
North Richland Hills, Texas
Burke, Virginia
Hanover, Virginia
Richmond, Virginia
Bellevue, Washington
Brady, Washington
Carson, Washington
Cathcart, Washington
Langley, Washington
Moclips, Washington
Port Townsend, Washington
Seattle, Washington
Vancouver, Washington

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