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大多数春季开花的花灌木都是在前一年夏季的高温时进行花芽分化,经过冬季低温阶段后第二年春季开花。紫玉兰一般一年开一次花,但笔者在唐山市发现了紫玉兰二次开花的现象。
Most flowering shrubs in spring are flower buds differentiated during the summer temperatures of the previous year and bloom the following spring after the winter cryogenic phase. Purple magnolia flowers once a year to open a general, but I found in Tangshan City purple magnolia secondary flowering phenomenon.