Gluten: a vegetable form of protein found in cereals.
Graft: to place a living branch or stem on another living stem so that it may grow there. It insures the growth of the desired kind of plant.
Granule: a little grain.
Gypsum: land plaster.
"Head back": to cut or prune a tree so as to form its head, that is, the place where the main trunk first gives off its branches.
Heredity: the resemblance of offspring to parent.
Hibernating: to pass the winter in a torpid or inactive state in close quarters.
Hock: the joint in the hind leg of quadrupeds between the leg and the shank. It corresponds to the ankle in man.
Host: the plant upon which a fungus or insect is preying.
Humus: the portion of the soil caused by the decay of animal or vegetable matter.