Don’t plant a clump of Oxalis unless you know its identity. The species described below are suitable, providing attractive foliage and summer flowers, but there are other types which spread everywhere and can ruin a large part of the rockery. Oxalis is an undemanding plant, but peat or compost should be added before planting.

VARIETIES: O. adenophylla is the most popular species grown in the rock garden – the basic details are height 3 in., spread 6 in.

Flowering period: June-July. The greyish foliage dies down in winter – label the site to avoid damaging the roots when weeding in the spring. The flowers are bowl-shaped and shiny, white with attractive pink edging and veining. O. enneaphylla has the same growth habit, and the variety ‘Rosea’ is popular as a rockery perennial. The rose-pink flowers measure about 1 in. across and the silvery leaves are partially folded. The only spreading species you should grow is O. chrysantha – height 2 in., spread 1 ft. This dainty carpeter bears yellow flowers.

SITE AND SOIL: Any well-drained soil – thrives best in full sun.

PROPAGATION: Divide clumps in autumn.

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