Allegheny Plum (Prunus alleghaniensis)

Allegheny Plum

Prunus alleghaniensis

Its spring blooms and edible plums blend wild charm with practical use. Deciduous small tree or shrub; common name: Allegheny plum.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; full sun promotes optimal fruiting, while partial shade is tolerated in hot summer climates
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Watering Water deeply when the top 5 cm of soil dries out; drought-tolerant once established, with minimal supplemental water needed in mature plants
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Temperature Extremely cold-hardy, surviving temperatures as low as -30°C; withstands warm summer temperatures up to 35°C without significant stress
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Characteristics

  • Leaf: Oval to oblong leaves, 5–10 cm long, serrated margins, green turning reddish in fall
  • Flower: Clusters of 2–5 white, 5-petaled flowers, lightly fragrant
  • Fruit: Small round red to purple plums, 1–1.5 cm diameter, edible when fully ripe
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Care Guide

Watering

Water regularly during fruit development to prevent premature drop; avoid waterlogging

Fertilization

Apply a thin layer of well-composted organic matter once in early spring. Avoid high-nitrogen fertilizers that promote foliage growth over fruiting

Eggshell powder topdress:Crush dried eggshells into fine powder and sprinkle 1–2 tbsp around the base of the plant in early spring; water in lightly to incorporate into soil
Pruning
  • Prune dead, diseased, or crossing branches in late winter before new growth emerges
  • Thin crowded stems to improve airflow and light penetration for better fruiting
  • Remove suckers growing from the base to maintain a tidy shrub or tree form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Seeds are toxic if ingested in large amounts; foliage and ripe fruit flesh pose minimal risk

Humans: Flesh of plums is safe for consumption; seeds contain cyanogenic glycosides that release cyanide when chewed and ingested in large quantities

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Garden Uses & Culture

Culture: N/A

Usage: Edible ripe plums used for jams, jellies, or fresh eating; ornamental spring blooms for wildlife gardens