Hardy herbaceous, tuberous-rooted and aquatic plants, mostly suitable for border cultivation.
Plant the tuberous – rooted species in autumn or spring in a compost of good sandy loam, enriched with decayed manure and leaf-mould. Plant the tubers firmly in the soil, placing claw-side down, setting them from 2-3 in. deep and 2-4 in. apart. Protect with a mulch of decayed manure or old leaves. They like plenty of water, and during active growth, doses of liquid manure may be applied. Lift when the leaves turn yellow and store in sand until it is time for planting.
Plant the hardy species in an ordinary soil in autumn or spring. Mulch in spring with decayed manure and lift and divide every three years, using fresh soil. This section likes a shad -, or partly-shady position.
The tender kinds need a sandy peat. They should be planted in a shady position at the foot of a wall or fence. This should be done in March. They need plenty of water. These plants will also grow well in the greenhouse, where they will make excellent decoration.
Seeds may be sown in the cool greenhouse when ripe, using a compost of loam, leaf-mould and sand.
Some of the best varieties for cultivation in the amateurs garden are as follow: R. aconitifolius (Fair Maids of France), single white flowers.
R. acris flore pleno, golden yellow, May. 18 inches. R. Alpestris, snow-white, 2 inches. R. gramineus, golden, with glaucous leaves. 9 inches.
R. parnassifolius, white, June. 6 inches. . R. Seguieri, white. 3 inches.