That would be good advice if there were any growing information on Grace Ward in the database. Unfortunately, that entry has not been filled out yet. I'll add some information to it later today. According to other sources, however, Grace Ward should be hardy to zone 6, so you can plant it outside anytime now in your zone, Jelinda.
It isn't called Lithodora anymore, by the way. Lithodora diffusa is now a synonym of Glandora diffusa.
