Commercial Floriculture

Photoperiodic control of flowering

• Even though the majority of orchids are day-neutral, there are a few species which are controllable.
• In these plants, the hormone phytochrome is produced only then the day and night are able to control the time of flowering in such species.
• The correct ratio between the light an dark periods and in some cases, the correct temperature also initiate the production of phytochrome, which is a protein acting as an enzyme.
• In general, orchids grow best in diffused light but there are certain orchids which grow well in high light.
• We should give our plants as much light as possible provided the roots stay moist and cool.