Propagated by stratified seeds. Some growers spread the haws in shallow piles in the fall, and allow them to decay, so that most of the pulp is removed before they are stratified. Haws often come irregularly, even from stratified seeds. The varieties are grafted, rarely budded, on common stocks. =Cress= (_Lepidium sativum_). _Cruciferæ._ Seeds, sown at any time of year. See Water-Cress. =Cress=, American. See Barbarea. =Cress=, Rock. See Arabis. =Crinum.= _Amaryllideæ._ Increased by seed, sown singly as soon as ripe in three or four-inch pots, in sandy loam and leaf-mould. Place in a temperature of from 70° to 80°, and keep rather dry until the plants appear, when more moisture should be applied. Also increased by offsets, which should be removed when rather small and potted separately, and grown as recommended for seedlings. =Crithmum.= _Umbelliferæ._ Propagated by seeds sown as soon as ripe, and by divisions. =Crocosmia.= _Irideæ._ Propagated by seeds sown in pans in a cold house as soon as possible after maturity. Also by offsets. =Crocus.= _Irideæ._ Propagated by seed, sown as soon as ripe or early in spring, the choicer strains in pots or boxes, using a light, sandy soil, and afterwards placing them in a cold pit or frame; the more common varieties may be placed in a warm position outside in a seed bed. Sow thinly, so that the plants may grow two years in the seed pan or bed without lifting. By the corms. These may be lifted and replanted, allowing each in its turn to develop new corms below. The following year new corms, or cormels, are also formed by the side of the old corms. These old corms die away annually. Some species increase much more rapidly than others. =Crossandra=, Harrachia. _Acanthaceæ._ Seeds. Propagated by cuttings, which root freely at almost any time of the year, in bottom heat. =Crotalaria= (Rattle-Box). _Leguminosæ._ Increased by seeds. The shrubby kinds by young cuttings, which root freely in sand, under glass, in a cool house. =Croton.= See Codiæum. =Crowea.= _Rutaceæ._ Seeds. Usually by green cuttings in a frame. =Crowfoot.= See Ranunculus. =Crucianella= (Crosswort). _Rubiaceæ._ Propagated by seeds, by divisions during spring or autumn, and by cuttings. =Cryptomeria= (Japan Cedar). _Coniferæ._ Increased by seeds, and by cuttings of growing wood planted in sandy soil, under glass. =Cryptostemma.= _Compositæ._ Propagated by seeds, which should be sown on a gentle hot-bed in early spring. =Cubeba.= See Piper. =Cucumber= (_Cucumis sativus_). _Cucurbitaceæ._ Seeds. If sown out-doors, the operation should be delayed until the weather is thoroughly settled. =Cucumber-tree.= See Magnolia. =Cunninghamia= (Broad-leaved China Fir). _Coniferæ._ Increased by seeds and cuttings of growing wood.