Answer: Most Lithodoras (also known as Lithospermum) are marginally hardy into zone 6 but "Grace Ward" is listed as hardy from zones 5 to 9. It requires an acid soil that is well drained. It prefers a sunny location so it may not do well under your deck if it is shady there. It is evergreen and stays short and creeping. It should be trimmed back lightly after bloom and does not transplant well.
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