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The means by which herbaceous stock may be increased. For large plants, two forks are inserted back to back into the clump of roots and carefully prized apart to divide the rootstock. Smaller plants may be divided by hand or with a knife.

- very striking swollen nodes on the culms. Only small at 1.5m with arching foliage.Fargesia murieliae - forms dense, arching clumps of very leafy canes. Spectacular on a terrace where the rustling and swaying becomes more mesmerising

Carol Klein demonstrates how to rejuvenate primula vulgaris by separating newly rooted growth and replanting it.springMore advice on growing flowersCaring for peoniesGrowing lupinsPlanting out cerinthesGrowing dahlias from seed

well during the summer. In colder areas protect the rhizomes from frost from January onwards with cloches, horticultural fleece or a thick mulch of straw or compost.Growing tipsLift and divide schizostylis rhizomes from mid- to late-spring every two

A term describing leaves that are twice divided into units of three individual leaflets.

Leaves having two or more similar parts, or being divided into two or more leaflets.

Leaf divided into finger-like segments or lobes.

To be grouped in threes. Having three leaflets, or a leaf that's divided into three parts.

A leaf divided into three distinct leaflets, which are attached to a common midrib.

Divided into three; leaves, sepals or petals having three lobes.