Rhodotypos scandens Seeds | Jetbead
LATIN NAME: Rhodotypos scandens
COMMON NAME: Jetbead
Plant Profile
The genus sits in the rose family near Kerria and Neillia, the group with opposite leaves and no stipules, and it shares their general look: slender stems, fresh green foliage and a long season of interest. The flowers are produced singly at the tips of short lateral shoots, held clear of the leaves, and they are noticeably large for a shrub of this size.
The leaves are opposite, oval, sharply toothed and strongly ribbed, and they turn a soft yellow before they fall. The fruit is the other field mark: the flower produces a cluster of usually four shiny black drupelets, held together in the centre of the faded flower, hard and glossy as beads.
The shrub was grown in Western gardens from the nineteenth century, and it has since naturalised in the eastern United States and eastern Canada, where it is listed as an invasive plant in several states. The reason is straightforward: it tolerates shade, it fruits heavily, birds carry the drupelets away, and it sprouts from the rootstock after cutting or burning.
Science & Biotechnology
The shrub was first placed with the kerrias and later given a genus of its own, and molecular work on the rose family has held that arrangement: Rhodotypos is the sole member of its genus, sitting in a small tribe with Kerria and Neillia. Its position has been tested with plastid and nuclear markers in phylogenetic work on the family.
Uses & Benefits
In the garden the shrub has three uses. It makes an informal hedge at about a metre and a half, where the white flowers and black fruit carry it through the season. It clothes a shaded bank in the awkward ground under deciduous trees. And as a specimen it earns its place in the shrub border, where the arching stems and four-petalled flowers are unusual enough to stop a visitor.
Prune immediately after the flowers have faded, taking out the oldest stems at the base and shortening the rest, because the flowers are carried on wood made the previous season and a late cut removes next spring’s display. A light trim in the first years builds a dense, well-branched shrub; after that, an annual thinning is enough.
Growing from Seed
Each drupelet contains a single seed enclosed in a hard stone, and the stone has to be softened before the seed inside will sprout. In the wild the drupelets fall to the ground and sit through a winter under leaf litter, and the same treatment works in a seed pan: sow fresh, keep the medium damp, and let the cold do its work over a full season.
Garden jetbead is raised from softwood cuttings taken in early summer, which root in a closed frame with little difficulty, and from hardwood cuttings lifted in autumn and lined out for a year. The rose family as a whole is the most micropropagated group of woody plants, and the techniques developed for kerria-type shrubs, axillary shoot culture started from a surface-sterilised bud and multiplied on a cytokinin medium before rooting, transfer directly to this species.
Collect the black drupelets as soon as they are fully ripe, rub the flesh off in water, and sow the stones in a pan of gritty compost. Leave the pan in a cold frame or outdoors under a cover for the winter, keeping the medium damp. Patience is required, and some stones will not sprout until they have been through two winters, so never throw out a pan that has stood quiet.
Seedlings rise with two rounded cotyledons, then produce true leaves with the toothed edge and ridged veins of the adult. Prick them into individual pots once the first true leaves have expanded and the stem has firmed, and grow them on in a shaded frame. Water steadily through the first summer and mulch the pots in autumn.
Our Take
Jetbead is the shrub I give to anyone with a shady corner and a taste for odd flowers, provided they are not gardening next to a nature reserve. If you like the four-petalled trick, Sorbaria arborea shares the same rosaceous growth and gives you frothy white plumes instead of single flowers. A word of caution for the American reader: Berberis thunbergii is already enough of an invader in eastern woodlands, and piling jetbead on top of it helps nobody. For berries with more colour and no weed record, winterberry Ilex verticillata is the better choice.
Related Reading
If Jetbead appeals to you, these related plants are worth a look: