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Forget about planting hibiscus in the ground! The ground temperatures drop too low in winter, particularly where long, cold winters are experienced. Plant them in pots, preferably plastic ones, which retain more warmth than terra cotta or cement, and are a lot easier to handle. Don't use too large a pot; nice plants can be grown in 20 cm (8 in) to 30 cm (12 in) pots, and remember you are the one that has to move it around from place to place whenever necessary.
Luckily, we already covered one of the associated problems with last week's e-mail tip on Mealy Bugs. In fact, my next book may be all about tropicals for Houston and that would definitely include a major chunk dedicated to Hibiscus. Like most situations in gardening, there is not one clear cut answer. But there are a couple of dominant reasons, especially in Houston. The first reason for bud drop can be attributed to the really hot weather. Remember, these are tropical plants that would much prefer 88-90 degrees with lots of humidity. Temperatures above 95 for long periods of time can stress out some Hibiscus hybrids to a point that they shed their blooms as a natural defense mechanism. Moving potted Hibiscus could also cause premature bud drop.