by 
The Curious Bag
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<h4 class="dechead">On One Hand: Plant In Fall and Spring
According to the National Gardening Association, ranunculus bulbs planted in October or November will begin to show growth in early spring. Bulbs may be planted again in the spring, for summer blooms.
On the Other: It Depends On Where You Live
For the best blooms, ranunculus bulbs should have six weeks of cool weather while sprouting. In warm climates, plant bulbs in the late fall, when it's cool. Bulbs planted in the spring will not thrive in the heat of summer.
Bottom Line
Nighttime temperatures of 30 to 50 degrees are ideal for ranunculus bulbs. The ranunculus bud, inside the bulb, will dry and not produce a bloom if exposed to warmer temperatures. A mild frost will not damage bulbs. The Weekend Gardener recommends planting bulbs every couple of weeks during the planting season, so blooms may be enjoyed for a longer period of time.
Source:
National Gardening Association: Prolific and Terrific: Ranunculus
East To Grow Bulbs: Tecolote Ranunculus Growing Information
Weekend Gardener: Double Plant Your Bulbs For Maximum Splendor
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