I moved from the North into the deep South. Do the recommendations I used to follow for growing houseplants in a sunny, south window no longer apply?
Yes and no. A plant that needs sun to grow needs it in the South (or Southwest) as well as in the North. But because the sun in the South rides higher in the sky and is hotter, a plant growing in a south window in the deep South may get more sun than it likes and be burned. For instance, in the North, orchids should be placed in a south window and exposed to sun all day long except in spring and summer, when midday shading is required. In the South, however, orchids must be protected from the midday sun the year round. You are right in suspecting that exposures recommended for northern houseplants may be harmful to southern houseplants, but there are no simple rules for figuring out the difference. If you know that a plant is finicky about sunlight to some degree, just watch it carefully. If it is getting too much sun, its yellow or bleached look will soon show that it dislikes the conditions in which it’s growing.
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