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Rubus pergratus

Blanchard

Upland Blackberry

Has a deadly poisonous lookalike — see comparison below

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iNaturalist· cc0

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A deciduous shrub growing to 3 m with hermaphroditic flowers attracting insect pollinators. Adapts to light sandy, medium loamy, and heavy clay soils with good drainage. Suitable for mildly acidic to alkaline soils and tolerates semi-shade or full sun; performs best with consistent moisture.

Description

A deciduous shrub growing to 3 m with hermaphroditic flowers attracting insect pollinators. Adapts to light sandy, medium loamy, and heavy clay soils with good drainage. Suitable for mildly acidic to alkaline soils and tolerates semi-shade or full sun; performs best with consistent moisture.

Edible Uses

The fruit can be eaten raw or cooked.

Medicinal Uses

None known

Distribution

It is a temperate plant.

Where It Grows

North America, USA,

Cultivation

We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in many parts of the country. According to one report this species is no more than a synonym of R. pensylvanicus. The following notes are based on the general needs of the genus. Easily grown in a good well-drained loamy soil in sun or semi-shade. Plants in this genus are notably susceptible to honey fungus.

Propagation

Seed requires stratification and is best sown in early autumn in a cold frame. Stored seed needs one month of stratification at around 3°c and should be sown as early in the year as possible. Prick out seedlings once large enough to handle and grow on in a cold frame before planting into permanent positions in late spring of the following year. Cuttings of half-ripe wood can be taken in July or August in a frame. Tip layer in July and plant out in autumn. Division can be done in early spring or just before leaf-fall in autumn.

Other Uses

A purple to dull blue dye is obtained from the fruit.

Notes

There are about 250 Rubus species.

Dangerous Lookalikes

This plant can be confused with the following toxic species. Always verify identification carefully before consuming any wild plant.

DEADLY

Red Baneberry

Actaea rubra

Walter Siegmund (talk)

Safe

Upland Blackberry

Rubus pergratus

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Red Baneberry: Short herbaceous plant (no thorns), berries on thick red stems, each berry has a single seed, compound sharply-toothed leaves.

Upland Blackberry: Thorny woody canes (brambles), aggregate berry made of many drupelets, berries pull easily from receptacle.

References (2)

  • Plants for a Future database, The Field, Penpol, Lostwithiel, Cornwall, PL22 0NG, UK. http://www.scs.leeds.ac.uk/pfaf/
  • Rhodora 8:96. 1906

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