(Woolly Knotweed. Nat. Ord. Polygonacese). This genus is not grown as often as it might be, but it includes some useful hardy herbaceous perennials and rock plants. It is not hard to grow provided that a light loamy soil with some peat in it is suppHed ; and it is propagated in the usual way by seeds sown in the spring or summer, and by division of the roots in the autumn or spring. Perennial Bolder Species. We briefly describe a few of the best below : Eriogonum compositum.A yellow or sometimes white species flowering from June onwards. Height, 12-18 ins. E. longifolium.A species with yellowish flowers blooming from June onwards. Height, 12-18 ins. E. tomentosum.This also bears yellowish flowers. They open in May and continue till July. Height about 2 ft. Rock Garden Species.The two described below are evergreen trailing plants suitable for a rocky bank : Eriogonum flavum. A tufted plant. Leaves entirely silvery. Flowers yellow in large umbels. Site sunny. Soil gritty loam. Flowering Period, July. Height, 9 ins. E. umhellatum.Also tufted, and spreading. Flowers golden-yellow. Site sunny. Soil gritty loam. Flowering Period, June to July. Height, 6 ins.
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