How to Grow Ranunculus Bulbs in Spring
Gardeners in hardiness zones 4-7 will have the best success with planting ranunculus bulbs in spring. Plan to plant ranunculus after the danger of frost has past, but before temperatures are above 70 degrees on a consistent daily basis. Ranuculus can be started indoors in a cool setting prior to moving outdoors when temperatures are favorable for the conditions they need.
Grow ranunculus in a full to part sun location in soil that drains well. Plant the bulbs 2" below the soil surface and water after planting. Prior to sprouting the bulbs do not require additional water. The bulbs may take 6-8 weeks to sprout and will remain dormant if planted when the temperatures are too warm. If planted in proper growing conditions expect the ranunculus to bloom in late summer.