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
Prunus 'Climax' Prunus 'Climax' 'Climax' is a "Prunus" cultivar, considered to be a plum. It was introduced in 1899 by plant breeder Luther Burbank. Burbank devoted a lot of work to hybridizing two plum species, the apricot plum or Simon plum "Prunus simonii" and the Japanese plum "Prunus salicina". He developed a number of cultivars from the hybrid, of which 'Climax' was particularly notable for its importance to the fruit shipping industry of California. The 'Climax' tree is less productive than some other plum cultivars. The fruit is extremely large and heart-shaped, with yellow flesh that is sweet and very juicy. The