gram. 1  the basic unit of mass in the metric system, equal to 0.03527 ounce (0.0022046 pound or 15.4321 grains): now defined in the SI system as 0.001 of the mass of the standard international kilogram (a platinum-iridium cylinder kept in France): one pound equals 453.5924 grams: abbrev. g.
1 Light: Hibiscus are full-sun plants. Lack of sunlight can cause overall yellowing of the leaves. On the other hand, if the plant is getting sunburned, the leaves can get yellow or white splotches.  Insect Infestation: Spider mites and aphids are two major pests of hibiscus that can cause leaf damage and discoloration.
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.