Rubus jacens

Blanchard

Spreading Dewberry

Rosaceae Edible: Fruit 1 iNaturalist observations

Has a deadly poisonous lookalike — see comparison below

iNaturalist· cc-by

Summary

Rubus jacens is a rare species of flowering plant in the rose family. It is native to eastern Canada (Ontario, Québec, Nova Scotia) and the north-eastern United States (New Hampshire, Vermont, New York, Pennsylvania). The genetics of Rubus is extremely complex, so that it is difficult to decide on which groups should be recognized as species. There are many rare species with limited ranges such as this. Further study is suggested to clarify the taxonomy. Some studies have suggested that R. jacens may have originated as a hybrid between R. setosus and R. hispidus.

Description

A deciduous shrub growing 0.3m tall by 2m wide with hermaphroditic flowers pollinated by insects. Tolerates light sandy, medium loamy, and heavy clay soils with good drainage. Grows in mildly acidic to basic soil pH, semi-shade or full sun. Unlike related species, adapts to both dry and moist soil conditions.

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 most parts of this country. 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 requires one month stratification at about 3°c and should be sown as early as possible in the year. Prick out seedlings when large enough to handle and grow on in a cold frame, then plant out into permanent positions in late spring of the following year. Cuttings of half-ripe wood can be taken in July/August in a frame. Tip layering can be done in July, with plants set out in autumn. Division is possible in early spring or just before leaf-fall in autumn.