Rubus caesius is a deciduous Shrub growing to 0.2 m (0ft 8in) by 1 m (3ft 3in).
It is hardy to zone (UK) 5. It is in flower from June to September, and the seeds ripen from July to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, flies, beetles, Apomictic (reproduce by seeds formed without sexual fusion). The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils and can grow in very alkaline soils.
It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.
Rubus caesius is similar to and often confused with forms of Rubus fruticosus. It is a small shrub growing up to 2 m (6 ft 7 in) tall with biennial stems which die after fruiting in their second year. It sends out long runners which root at the tip to form new plants. The stems are bluish-grey and sometimes prickly. The alternate leaves are hairy above and below. They are stalked and the leaf blades are palmate in shape, either consisting of three oval leaflets with serrated margins and acute points or just being three-lobed. The inflorescence is a loose cluster of several white flowers about 2.5 cm (1 in) in diameter. The calyx has five sepals and the corolla is composed of five spreading petals with finely toothed margins. There is a boss of stamens in the centre and there are several pistils. The fruit is an aggregate of several black, fleshy drupes with a bluish waxy bloom. The dewberry flowers from June to September.
This plant is useful.