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.
Leaves on potted hibiscus plants turning YELLOW. Discussion in 'Plant Pests, Diseases and Weeds' started by gsdruth, Aug 23, 2012. My once beautiful potted hibiscus plants on my patio are beginning to look like crap! I have two plants that have done beautifully on my patio this summer in large pots. Now...both plants the leaves are turning yellow and falling off. One of my plants is almost bare the other isn't far behind.