Of all the colorful berries that ripen in autumn, firethorn, Pyracantha coccinea, is the most colorful, and also the most familiar. The berries are almost always bright red, deep red or reddish orange. Cultivars with orange berries have become rare. Those with yellow berries are even more rare, and are weaker plants anyway. The berries can linger through winter, but typically get eaten by birds half way through.
Firethorn earns its name with formidable thorns. A hedge of firethorn is more impenetrable than a fence topped with barbed wire, but much more appealing with glossy evergreen foliage. The only problem is that no one wants to prune such a nasty hedge! The arching stems can get taller than ten feet, and without adequate pruning, can easily get as broad. Young plants are limber enough to be espaliered.
The fragrance of the profuse clusters of tiny white flowers that bloom in spring and summer may be objectionable to some. Shade inhibits bloom and subsequent development of berries. Feral seedlings sometimes appear, but they are wimpier, thornier, and less prolific with berries than their modern cultivar parents are.