|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
10 In stock
(Early-flowering borage, Abraham-Isaac-Jacob)
Originating from Eastern Europe
An invaluable plant for deep shade, even dry shade, Trachystemon produces starry blue flowers in spring followed by good sized heart-shaped, wavy-edged leaves, sometimes up to a foot long.
Not a show stopper but handsome enough and does a superb job of suppressing weeds and growing where nothing else stands a chance, like the base of trees.
Grow in dry soil in shade/part shade. In rich moist soil it can be invasive.
Height and spread after 2 – 3 years 40cm x 80cm
Semi mature height and spread after 4 – 5 years 40cm x 2m