Big tree beside the greenhouse is partly shading the orchids. Definitely,it makes the surrounding cooler. Usually having a greenhouse, orchids will receive less light but at the same time, the most sun exposure. It really depends on how the greenhouse is constructed facing the direction needed to protect the orchids. (Click on images to view larger)
Dendrobium Hybrids, common type of orchids available during hot days. Light levels clearly shows certain amount of sunlight. That can make a different kind of exposure at different time of the day. Other varieties of orchids are sensitive to the direct rays of the sun that’s why, a good foundation is needed to protect the orchids.
Yesterday, I visited the Garden Orchids along White Plains. I observed the greenhouse, insulation was added like; polythene and plastic sheeting. Other orchid gardens in my friends backyard, they prefer the glass sheeting which is more expensive but it looks neat and durable. To some, they want polythene tunnels.