Kalmia.—Remove seed-pods as soon as the flowers are past.
Kerria.—Cut away the old wood to encourage the young growths, which yield the best flowers.
Laburnum.—These should be thinned after flowering, cutting away the old or weakly wood, and shortening any long or straggling shoots.
Lavandula.—Cut away all flower-spikes after they are past.
Ledum.—Remove seed-pods after flowering.
Lespedeza.—See Desmodium, which it much resembles.
Leucothoë.—L. axillaris and L. Catesbæi flower much better if the old growths are removed and strong young shoots encouraged. The rest of the genus require no pruning.
Leycesteria.—Thin out old growths every spring.
Ligustrum.—L. ovalifolium and its golden variety are all the better for being cut down each winter while in a young state. The remainder merely require an occasional thinning.
Liriodendron.—Requires no pruning.