American plum

Photo: Andrew Ciscel — CC BY-SA 2.0 · source

Survives zone 3 through 8

Harvest calendar

Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.

The American plum — the hardiest plum in this catalogue and the backbone of prairie shelterbelts. Fruit about 25mm, succulent and juicy but rather acid with a tough skin; the better selections are pulpy and genuinely pleasant fresh, and all of it cooks and preserves well.

Hardiness

Zone 3–8

Habit

Tree

Edible part

Fruit

Ripens

August

Mature size

Small suckering tree to 6 m, medium growth rate; forms thickets

Light

Full sun for a crop; tolerates partial shade

Soil pH

5.5–8.0 (mildly acid to mildly alkaline)

Environment

Temperate

Native range

North America — New York to Florida and west to the Rocky Mountains, on rich soils in mixed deciduous woodland, by streams, on swamp borders and in hedgerows.

Status

Both wild and cultivated

Years to fruit

3–5 yrs

Growth speed

30–60 cm/year — medium to fast.

Spacing

350 cm (138 in) apart — about 12 m² (132 sq ft) per plant

Leaf shape

Alternate, oval to obovate, 6–10 cm long, drawn to a sharp point, with sharply and often doubly toothed margins and a slightly rough upper surface.

Root system

Shallow and suckering, throwing root shoots that build a thicket over time — the reason wild American plums form dense colonies.

Fruit description

Round plums 2–3 cm across, ripening yellow then bright red with a faint bloom; the skin is tough and tart, the flesh juicy and sweet-tart — excellent for jam and jelly, decent fresh when dead ripe.

Propagation

Suckers lifted in the dormant season are simplest and come true. Seed needs about 90–120 days moist cold stratification at 4°C after the flesh is cleaned off.

Pollination

⚠ Reports genuinely conflict: some extension sources call American plum self-fertile, but self-incompatibility is widespread across Prunus and most growers report far better crops with a second plant. Treat a lone tree as a gamble and plant two or more distinct seedlings. Insect-pollinated, and an important early nectar source.

The edible parts listed above are a starting point, not a field guide. Identify a plant with certainty — ideally against a local authority — before eating any part of it, and read the full disclaimer. Spotted something wrong? Report it.