Ranunculus Flower Zone 3. Planted there in October or November they flower in March. Members of the genus are known as buttercups spearworts and water crowfoots.
16012017 Ranunculus does best in regions with mild winters and long cool springs. Ranunculus are cool season flowers that grow best in spring-like temperatures of about 55F. Ranunculus can grow well in zones 310 but you must lift in zones.
-2 C and thrive best in USDA zones 8 to 10.
Ranunculus typically bloom around 90 days after planting and they are so worth the wait. The range of minimum average temperatures for zone 3 is between -40F and -30F or -40C and -344C. Planting Time Ranunculus are ground-hardy in warmer areas and can be planted in the autumn between. In warm climates zones 8-10 the corms are planted in the fall so they bloom in late winter or early spring.