TIGELLA: A short stem.
TIGELLATE: Having a short stalk, such as that of a bean.
TILLAGE: The operation or art of tilling land, or preparing it for seed, and keeping the ground free from weeds that might impede the growth of crops; cultivation; culture, husbandry. Tillage includes manuring, plowing, harrowing, and rolling land, or whatever is done to bring it to a proper state to receive the seed, and the operations of plowing, harrowing, and hoeing the ground to destroy, weeds and loosen the soil after it is planted.
TILTH: The condition of a soil in respect to its ability to support the growth of a specific type of plant.
TISSUE CULTURE: A method of asexual propagation used by commercial growers to produce clones of a particular plant in large quantities. It produces marketable plants faster than growing them from seed. Meristem cells are grown in nutrient solutions in laboratory flasks until they have recognizable roots and leaves. They are then transplanted into a suitable potting medium. The process is widely used in commercial orchid growing and is sometimes called meristem culture.