Prunus apricots, of cherries, and of plums, all of which have cultivars developed for commercial fruit and nut production. The almond is not a true nut, the edible part is the seed. Other species are occasionally cultivated or used for their seed and fruit. A number of species, hybrids, and cultivars are grown as ornamental plants, usually for their profusion of flowers, sometimes for ornamental foliage and shape, and occasionally for their bark. The Tree of 40 Fruit has forty varieties grafted on to one rootstock. Species such as blackthorn ("Prunus spinosa"), are grown for hedging, game cover, and other utilitarian
Aralia spinosa fruit. The fruit was used in many of the natives' foods. The women would take the flowers and put them in their hair because of the lemony smell. The flowers could also be traded for money. In the past, botanists attributed occurrences of "Aralia" north of Maryland and Delaware in the Middle Atlantic states to introductions of "Aralia spinosa" from areas to the south. However some of these occurrences are now known to be of "Aralia elata" (Japanese Angelica-tree), a related Asian species that is invasive in the area. "A. spinosa" and "A. elata" are difficult to distinguish in the