Rubus tuberculatus (Ruderal Corylifolian)

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Rubus, Genus, tuberculatus, Species,

Genus & species

ruderal corylifolian

Rosaceae Europe

Attracts Pollinators Attracts Butterflies Drought Tolerant

SunFull Sun – Part Shade

WaterMedium · drought-tolerant

HardinessZones 5–8

Overview

Rubus tuberculatus is a bramble in the rose family, one of the many microspecies within the blackberry aggregate (Rubus fruticosus agg.) and placed in the section Corylifolii. Like other brambles it is a scrambling, semi-deciduous shrub with arching, prickled stems, or canes, that root at the tips where they reach the ground and form thickets. The compound leaves usually have three to five toothed leaflets, green above and paler beneath, carried on prickly stalks. From early summer it bears clusters of five-petalled white to pale pink flowers about 0.8-1.2 inches (20-30 mm) across, followed by clustered black, juicy fruits of the blackberry type. As a member of the Corylifolii, it tends to have broad leaflets and comparatively few prickles, and it reproduces largely without cross-fertilisation, so its features stay constant from plant to plant. It grows on hedge banks, woodland edges, rough grassland, and waste and disturbed ground, tolerating a wide range of soils in sun or partial shade. Its arching, rooting canes let it spread into dense, thorny stands that can crowd out lower plants.

Native Range

Part of the blackberry complex native to Europe, with this microspecies recorded mainly in Britain and neighbouring areas of north-west Europe. It grows in lowland hedgerows, woodland margins, and disturbed ground.

Suggested Uses

Grown or tolerated in wildlife hedgerows, boundary thickets, and informal screening, and valued for its blackberry fruit. The dense, thorny growth shelters nesting birds and small animals, and the flowers and fruit feed insects, birds, and mammals. It suits wild margins rather than tidy borders.

How to Identify

A blackberry-type bramble with arching, prickly canes that root at their tips and compound leaves of three to five toothed leaflets. The white to pale pink flowers give way to clustered black fruit. As a microspecies of section Corylifolii it shows broad leaflets and relatively sparse prickles, though confident naming needs specialist comparison.

Appearance

Size & Dimensions

Height3' - 8'

Width/Spread5' - 10'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~8 weeks

Flowers: June–August

Summer

Flowers open through early and mid summer, roughly June to August, in branched clusters at the cane tips. The white to pale pink flowers draw bees, hoverflies, and other insects for nectar and pollen. Blackberry fruits ripen from late summer into autumn.

Detailed Descriptions

Flower Description

white to pale pink

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 4-9 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.5 - 7.5 (Acidic to alkaline)

3579

Soil Types

loam clay sand

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Rubus tuberculatus grows in sun or partial shade on most moist, free-draining soils, from loam to clay and sand. Like brambles generally it tolerates poor ground and neglect and needs no feeding, spreading readily once established. New plants arise from tip-rooting canes and from seed spread by birds eating the fruit. The arching canes are biennial, growing one year, then flowering and fruiting the next before dying as new canes replace them. Cutting back and removing rooted tips keeps a stand within bounds. Deep shade and waterlogged ground limit its growth.

Pruning

Old fruited canes are cut out at the base after fruiting, while strong new canes are kept for the following year. Spreading and tip-rooting stems are shortened or removed to contain the thicket. Cutting in late winter also controls its spread.