Dipladenia. Apocynaceæ.
In spring, when the plants commence new growth, cuttings from the young shoots are made. These, or single eyes, should be placed in a mixture of sand and peat, in good bottom heat.
Diplazium. See [Ferns].
Diplothemium. Palmæ.
Propagation is affected by seeds.
Dipteracanthus. See [Ruellia].
Dirca. Thymelæaceæ.
Increased by seeds or layers.
Disa. Orchideæ.
D. grandiflora and others of similar habit are propagated by offsets. These are best taken off about December, and treated like the old plants. (See under [Orchids].)