=Cakile= (Sea Rocket). _Cruciferæ._ Propagated by seeds sown in spring. =Caladium.= _Aroideæ._ Increased by tubers, which have been kept dry or rested for some time. Place in small pots in a stove or pit, where the night temperature is maintained from 60° to 65°, and syringed daily once or twice at least. Large tubers, if sound, may be divided and the pieces potted. Some also by cuttings. =Calamagrostis.= _Gramineæ._ Increased by seeds sown in autumn or spring. _C. arenaria_ (now _Ammophila arundinacea_), used for holding sands along sea-shores, is propagated by division and can probably be handled easily by root-cuttings. =Calamintha.= _Labiatæ._ Increased by seeds, root divisions, or cuttings in spring. =Calamus.= _Palmæ._ Increased by seeds. =Calandrinia.= _Portulacaceæ._ Increased by seeds sown in pots where they are intended to flower, as transplantation, unless performed with more than ordinary care, will check their growth or result in loss. =Calanthe.= _Orchideæ._ As a rule, the natural annual increase in the number of pseudo-bulbs meets the requirements of most cultivators. Where a quick propagation is desired, it may be performed by dividing the pseudo-bulbs transversely; after allowing the raw surface to callus, the upper part should be set on moist sand, and several buds will form around the base. The bottom portion may be used in the ordinary way. Another plan is to divide the pseudo-bulbs lengthwise into two or more pieces. (See under Orchids.) =Calathea.= _Scitamineæ._ Increased by division in summer or any time between that and the spring months. When making divisions, see that each crown is well furnished with roots. =Calceolaria= (Slipperwort). _Scrophularineæ._ Herbaceous kinds increased by seeds sown from June to August on pans of light, sandy soil, which should be soaked with water before sowing. Care must be taken to make the surface of the soil level, and also to sow the seed as evenly as possible. It is better not to cover with soil, but a sheet of glass should be laid over the pan, which must be placed in a shady part of the greenhouse or cold-frame until the young plants show the first leaf. The glass can then be gradually removed. The shrubby kinds, by seeds and by cuttings in August. Place in a cold-frame facing the north, in sandy soil, and when rooted, pot off into 3-inch pots. Place in a light, sunny frame, where they may remain until the middle of February. =Caldcluvia.= _Saxifrageæ._ Propagated by cuttings of the half-ripened shoots planted in sand under a hand-glass, and placed in a very gentle bottom heat. =Calectasia.= _Juncaceæ._ Propagated by divisions. =Calendula= (Marigold). _Compositæ._ Increased by seeds and by cuttings, which thrive well in a compost of loam and peat.