How to Bloom Jasminum polyanthum
The blooming cycle of this jasmine is induced by environmental conditions. Cool nighttime temperatures, kept below 60° and above freezing on a consistent basis, initiate the flower buds. Once buds have formed, continue to keep the night temperatures on the cool side so as not to force active growth. When color in the buds is showing, warming them up will hasten the flowering. Pruning can take place once the flowering cycle is complete but no later than early to mid-summer. Another cultural requirement is high light level. They need to be grown under as much light as possible even though the day length may be short.