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光照、温度是影响花木开花的主要因素。光照与开花光照强度按不同植物对光照强度的要求不同,可分为阳性植物和阴性植物。多数露地1—2年生及宿根花卉、温室多浆植物等,必须在完全的光照下生长,否则生长不良,这些植物为阳性植物。君子兰及各种兰科植物、秋海棠、凤梨科、姜科、苦苣苔科及蕨类植物等,需要适当荫蔽条件才能生长良好,它们不能忍受强烈的直射光,这些花木为阴性植物。日光的强弱对花蕾开花时间影响很大,如半支莲、酢浆草必须在强光下开放。晚香玉、紫茉莉在傍晚怒放。牵牛花盛开于晨曦之中。君子兰在强光照下,花期短花色艳,在弱光下花期较长花色较淡。含苞待放的花朵,遮荫后能延长开花时间。
Light, temperature is the main factor affecting the flowering of flowers and trees. Light and flowering light intensity according to different plants on the light intensity requirements can be divided into positive plants and negative plants. Most open 1 - 2 years and perennial flowers, greenhouse plants, etc., must be grown in full light, or poor growth, these plants are positive plants. Clivia and a variety of orchids, Begonia, Bromeliaceae, Zingiberaceae, Gesneriaceae and ferns, etc., need proper shade conditions to grow well, they can not stand strong direct sunlight, these flowers are negative plants. The intensity of sunlight has a great influence on the flowering time of buds. For example, the half-stick lotus and oxalis must be open in bright light. Tuberose, mirabilis in full bloom in the evening. Morning glory bloom in the morning light. Clivia in strong light, flowering short color Yan, in the weak light flowering longer color lighter. Budding flowers, shade can extend the flowering time.