Named cultivars are propagated by cuttings or layers grafted on quince rootstock. Most peach trees sold by nurseries are cultivars budded or grafted onto a suitable rootstock. Seedling&colon; Very vigorous trees produced on a rootstock grown from seed. Quince is also used as rootstock for certain pear cultivars. The numerous hybrids are propagated mainly by grafting on to seedling rootstock. Melocoton is a peach grafted on a quince rootstock. It is very commonly grafted onto sufficient rootstock. The plant part grafted onto the rootstock is usually called the scion. The plants are large tropical and subtropical perennial herbs with a rhizomatous rootstock. The Tree of 40 Fruit has 40 varieties grafted on to one rootstock. The rootstock consists of rhizomes, growing vertically down. Therefore, most kiwifruits, with the exception of rootstock and new cultivars, are propagated asexually. Many fruit trees are cultivated by grafting the body of a sapling onto a rootstock. On sand, they are grafted on rough lemon rootstock. There is an increasing range of genetic selections which are budded onto citrus rootstock.