昙花什么时候开,如何让昙花白天开花
昙花什么时候开,如何让昙花白天开花,昙花花形美,花朵大,具有独特的清香,观赏价值较高。但由于花期短,仅3~5小时,而且在晚上开放,素有“昙花一现”之说。但是,采用一些措施可以使昙花白天开放,并使花期延长。
(1)改变光照时间。在昙花花蕾有手指大小时,从早晨5时开始,用黑色布或黑色的塑料袋把昙花套住,放在凉爽黑暗处。到晚上6~7点时去掉黑套,放在40瓦的电灯或15~20瓦的日光灯下,使其照光到第二天早晨5时。这样连续处理10天左右,可使昙花在白天开放,并延长花期2~3小时。
(2)延长光照时间。除了白天正常光照外,在夜间再放在15~20瓦的日光灯下照射3~4小时,可使昙花在白天开放5~7小时,而且花朵比夜间开放得大1~2厘米,花色鲜艳。
(3)嫁接改变生物学特性。选择两年生健壮的令箭荷花做砧木,从6~15厘米处剪去上半部分,在剪口处用小刀顺扁平方向向下切一长5厘米的切口,再选生长健壮、大小适中的昙花变态茎,插在砧木的切口,包扎好。然后把嫁接好的植株放在阴凉处,保持土壤湿度为35%~40%,适当追施磷、钾肥,经过15~20天即可成活。这种昙花一年开3~4次,花期较长,每朵花可开3~5天,花朵直径13~20厘米,比夜间开放的花朵大一倍左右。
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