The plants demand sun, but only experience ...
The plants demand sun, but only experience will enable the grower to steer the fine course between enough sun and the excessive amount that will burn.
Generally speaking, the greenhouse glass may be kept clear for only a few weeks in mid-winter.
At all other times it is necessary to provide shade of one sort or another, both to avoid excessive temperature and to prevent burning.
An attempt should be made to approximate the degree of shade found in the natural habitat of the plants, where sunlight is filtered through layers of jungle growth.
The cheapest and easiest method of shading is to paint the glass on the exterior with some mixture that admits considerable light and that may be easily removed in the late fall to admit clear sun in winter.
Either a mixture of white lead and gasoline or a white casein paint that will wash off is satisfactory for this purpose.
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Stay tuned for more orchid-growing advice tomorrow! :)
Woo hoo!

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