Plants that lose their leaves at the end of the growing season. Also called caducous.
Dehiscent
Dry fruit which opens when mature, freeing the seeds.
Delphinium
Received its name (Delphinium) because the shape of the nectary resembles a dolphin. Also called larkspur.
Dendrobium
Dendron means tree. Dendrobium is an epiphytic orchid found upon trees.
Dentate
With toothed margin.
Disc
Central portion of the capitula of composites, formed by the close aggregation of tubular florets; the yellow circle at the center of the sunflower is a floral disc
Division
Vegetative propagation technique that consists in cutting the whole of the roots, the rootstalk (or rootstock), tuber or other belowground structures into two or more parts. As a rule, any plant with more than one stem can be propagated by division (vertical cut of the rootstalk).
Dormancy
Period of the year in which the plant is inactive, producing few or no leaves.
Double flowers
Flowers that have at least two rings of petals. In general, the stamens and pistils in the center of the flower are replaced by more petals. Double flowers are usually cultivars. For example, some varieties of roses. (Also see Simple Flower, and Semi-Double Flower).
Drainage
Structure or operation to facilitate water from draining out of vases, other recipients or plant beds.