Prunus maritima var. gravesii (Small) G.J.Anderson
Prunus declinata Marsh.
Prunus lancifolia Clav.
Prunus littoralis Bigel.
Prunus poiretiana Heynh.
Prunus pubescens Pursh
Prunus pygmaea Willd.
Prunus reclinata Bosc ex Spach
Prunus sphaerica Willd.
Prunus maritima, the beach plum,[3] is a species of plum native to the East Coast of the United States. It is a choice wild edible and its few pests and salt tolerance make it a resilient fruit crop for degraded lands and urban soils.
Prunus maritima is a deciduousshrub, in its natural sanddune habitat growing 1–2 meters (3+1⁄2–6+1⁄2 feet) tall, although it can grow larger, up to 4 m (13 ft) tall, when cultivated in gardens. The leaves are alternate, elliptical, 3–7 centimeters (1+1⁄4–2+3⁄4 inches) long and 2–4 cm (3⁄4–1+1⁄2in) broad, with a sharply toothed margin. They are green on top and pale below, becoming showy red or orange in the autumn. The flowers are 1–1.5 cm (3⁄8–5⁄8in) in diameter, with five white petals and large yellow anthers. The fruit is an edible drupe 1.5–2 cm (5⁄8–3⁄4in) in diameter in the wild plant, red, yellow, blue, or nearly black.[4][5]
The plant is salt tolerant and cold hardy. It prefers the full sun and well-drained soil. It spreads roots by putting out suckers but in coarse soil puts down a taproot. In dunes it is often partly buried in drifting sand. It blooms in mid-May and June. The fruit ripens in August and early September.
The species is endangered in Maine, where it is in serious decline due to commercial development of its beach habitats.[4]
The species was first described by Marshall in 1785 as Prunus maritima, the "Sea side Plumb".[6] A few sources cite Wangenheim as the author,[7] though Wangenheim's publication dates to 1787, two years later than Marshall's.
A plant with rounded leaves, of which only a single specimen has ever been found in the wild, has been described as P. maritima var. gravesii (Small) G.J.Anderson,[8] though its taxonomic status is questionable, and it may be better considered a cultivarP. maritima 'Gravesii'.[9] The original plant, found in Connecticut, died in the wild in about 2000, but it is maintained in cultivation from rooted cuttings.[8]
The species can be found from Maine south to Maryland.[10][11] Although sometimes listed as extending north to Canada's New Brunswick, the species is not known from collections there and does not appear in the most authoritative works on the flora of that province.[12]
The species is grown commercially for fruit and value-added products like jam.[13] Taste of ripe fruit is prevailingly sweet, though individual bushes range in flavor and some are sour or slightly bitter. About the size of grapes, beach plums are much smaller in size when compared to the longer cultivated Asian varieties found in the supermarket, though are resilient to many North American stone fruit pests, such as black knot fungus. A number of cultivars have been selected for larger and better-flavored fruit, including Resigno, Jersey Gem (Rutgers),[14] ECOS, Eastham, Hancock and Squibnocket.[15]
Fresh and dried, it was used extensively by Native Americans and eventually colonists. It is experiencing a revival in popularity with the resurgence of foraging, the local food movement, and the prominence of native species selection in permaculture design.
^USDA, NRCS (n.d.). "Prunus maritima". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 14 October 2015.
^ abMaine Department of Conservation Natural Areas Program: Archived 2012-03-11 at the Wayback Machine
^Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN0-333-47494-5.
^Grier, N. M., & Grier, C. R. (1929). A List of Plants Growing Under Cultivation in the Vicinity of Cold Spring Harbor, New York. American Midland Naturalist 11: 307–387.
^Snell, S.C. (September 2018). "Plant Guide: Beach Plum Prunus maritima Marshall"(PDF). Cape May, New Jersey: United States Department of Agriculture Natural Resources Conservation Service, Cape May Plant Materials Center. Retrieved 1 January 2024.
