Stocks are grown from stratified seeds, which should be sown an inch or two deep. Some species, as _A. dasycarpum_, come readily if seeds are simply sown as soon as ripe. Varieties are often layered, but better plants are obtained by grafting. The Japanese sorts are winter-worked on imported _A. polymorphum_ stocks, either by whip or veneer grafting. Varieties of native species are worked upon common native stocks. Maples can also be budded in summer, and they grow from cuttings of soft and ripe wood. =Aceras.= _Orchideæ._ Propagated by carefully made divisions of the tubers. (See under Orchids.) =Aceratium.= _Tiliaceæ._ Propagated by ripe cuttings, which root readily in sand, in heat, under a hand-glass. =Achania.= See Malvaviscus. =Achillea.= Including Ptarmica (Milfoil), _Compositæ_. Propagated by seeds, root divisions and cuttings, during spring. =Achimenes=, including Scheeria. _Gesneraceæ._ Propagated by seeds, carefully sown in well-drained pans, which are filled nearly to the rim, levelled, and well watered with a fine rose. Sow seed and cover lightly with sand, and place in shady position. Keep moist and apply water very lightly. Place a sheet of glass over the seed-pan. After large enough to be pricked off, treat like rooted cuttings. The best time for all modes of grafting is early spring. By scales from the corms, carefully rubbed off and sown like seeds, in pots or pans of the same compost, barely covered with sand, and placed in bottom heat. By leaves, severed from the stems, and pricked into pots of similar soil to the cuttings, placing all the petiole below the surface, and placed in bottom heat. By cuttings from any portion of the stem; insert in a soil of equal parts of peat and sand, in well-drained pots, and place in bottom heat. =Achras.= See Sapota. =Achyranthes.= See Iresine. =Achyronia.= See Priestleya. =Aciphylla.= _Umbelliferæ._ Propagated in spring by seeds or divisions. =Acis.= See Leucoium. =Acisanthera.= _Melastomaceæ._ Increased by cuttings, which root freely in a mixture of loam, sand and peat, in stove temperature. =Acmadenia.= _Rutaceæ._ Increased by cuttings pricked in a pot of very sandy soil, covered with a bell-glass. =Acmena.= _Myrtaceæ._ Propagated by placing half-ripened cuttings in sand under a glass without heat. =Aconitum= (Aconite, Monk's Hood, Wolf's Bane). _Ranunculaceæ._ Seeds should be sown as soon as ripe in a cold-frame or border; also by division. Roots should not be left about, for they are very poisonous. =Acontias.= See Xanthosoma. =Acorns.= See Quercus. =Acorus.= _Aroideæ._ Propagated during spring by divisions. =Acradenia.= _Rutaceæ._ Propagated by seeds and cuttings under a bell-glass. =Acridocarpus.= _Malpighiaceæ._