Prunus spinosa Britain, and in Germany and other central European countries. Sloes can also be made into jam, chutney, and used in fruit pies. Sloes preserved in vinegar are similar in taste to Japanese "umeboshi". The juice of the fruits dyes linen a reddish colour that washes out to a durable pale blue. Blackthorn makes an excellent fire wood that burns slowly with a good heat and little smoke. The wood takes a fine polish and is used for tool handles and canes. Straight blackthorn stems have traditionally been made into walking sticks or clubs (known in Ireland as a shillelagh). In
Prunus persica × Prunus americana tree is included in the Purdue University book "Fruit Breeding", Volume 1. The hybrid at Broadus, Montana has never fruited as the flowerbuds have all winterkilled. The hybrid has bloomed in Pennsylvania and the blooms are sterile. As of 2013, the hybrid near Broadus is still alive. Prunus persica × Prunus americana Prunus persica" × "Prunus americana is the hybrid between the peach "Prunus persica" (often a nectarine) and the wild American plum "Prunus americana". Hybrids were obtained in the 1940s at the University of Minnesota, and have been used in subsequent breeding, such as in the parentage of a