Growing ranunculus • Part 1 • Overwintering in warmer climates (zone 7 ) Plant in November. I like to do a presoak to get those corms hydrated. I soak mine in cool water for 3-4 hours or until the corms look plump. Then I plant them directly into an unheated greenhouse. Once they are planted I like to mulch with compost for added fertility and cold protection. It’s important not to water until you see green (unless your soil is bone dry) so that you don’t encourage rot. Once you see green leaves