Knotweed

Knotweed (Polygonum) - A vast family, comprising 150 species of world-wide distribution, the majority insignificant weeds, but with several noble plants well worth considering for their beauty of form. They thrive in any soil; those of a bushy habit should be allowed plenty of space. Confinement mars their beauty, which lies in the many flower-spikes rising above a gracefully developed mass of foliage reaching to the ground. Also See Flowers

Contents 1 Related Flowers 1.1 Polygonum Affine 1.2 Polygonum Baldschuanicum 1.3 Polygonum Cilinode 1.4 Japan Knotweed 1.5 Polygonum Multiflorum 1.6 Persicary 1.7 Polygonum Polystachyum 1.8 Polygonum Sachalinense 1.9 Polygonum Sphaerostachyum 1.10 Polygonum Vaccinifolium

Related Flowers

Polygonum Affine

Polygonum Affine - An alpine plant of the Himalayas, where it grows on the wet river banks and meadows, and hangs in rosy clumps from moist precipices. In cultivation it is 6 to 8 inches high, with rosy-red flowers in dense spikes borne freely in September and October. P. Brunonis is similar and as desirable; the flowers, of a pale rose or flesh color, borne in dense erect spikes nearly 18 inches high, and continuing more or less through the summer.

Polygonum Baldschuanicum

Polygonum Baldschuanicum - A plant of value for draping low trees and bushes. Its sprays of rose-flushed flowers come in quantity with pretty effect during summer and autumn. Too often it is set to climb an upright pillar, but is prettier left to grow freely among shrubs or along a stretch of sunny fencing, finding its own way gracefully. Its rosy fruits as well as its flowers make it a bright object for weeks together. C. Asia.

Polygonum Cilinode

Polygonum Cilinode - A climbing kind from N. America, of great vigour, a single plant covering many square yards in a season, with myriads of small white flowers of charming effect in autumn. For covering trees, thrusting its way through bushes, or to adorn a hedgeside, this is one of the best, not being averse to shade.

Japan Knotweed

Japan Knotweed (Polygonum Cuspidatum) - Of fine graceful habit, its creamy-white flowers borne in profusion. It should be grown apart on the turf or in the wild garden. It is easier to plant than to get rid of in the flower garden; a rank weed, right in copse or pond side.

Polygonum Multiflorum

Polygonum Multiflorum - A tuberous-rooted kind from China and Japan, with shining deep-green leaves and loosely spreading bunches of tiny white flowers on reddish stems. Its chief merit is its great vigour in rough places of the wild garden, or to hide unsightly objects in a short time.

Persicary

Persicary (Polygonum Orientale) - An annual kind, easily raised from seed, and sometimes self-sown in old gardens. It is mainly useful for bold temporary planting, reaching a height of several feet within a few weeks, and its white or rosy-purple flowers are of some effect in autumn.

Polygonum Polystachyum

Polygonum Polystachyum - A Himalayan plant much confused with P. molle, to which it is superior. It never grows high, and from late in September carries a mass of spreading plume-like sprays of white flowers, with a scent of honey, and lasting for several weeks. It needs quite a sharp November frost to check it, and its stout leafy stems, with their olive-green leaves threaded with red veins, are neat all the summer, and its roots do not run.

Polygonum Sachalinense

Polygonum Sachalinense - A huge perennial with bright green leaves upwards of a foot in length, the flowers greenish-white, in slender drooping racemes. It thrives in a moist soil near water, where it is effective, and it makes a fine feature on the turf or in a spot where it can run about freely. Sachalien.

Polygonum Sphaerostachyum

Polygonum Sphaerostachyum - One of the dwarfest and prettiest of the group, but not always easy to grow. From a tuberous root rise short semi-prostrate stems with narrow leaves and drooping spikes of blood-red flowers, continued through a long season on a healthy plant. It increases very slowly, and thrives best in an open place in the rock garden, where it can enjoy moisture in summer and yet be dry in winter. Himalayas.

Polygonum Vaccinifolium

Polygonum Vaccinifolium - Very distinct in aspect, quite hardy, and thrives in almost any moist soil, but is best seen where its shoots can ramble over stones or tree stumps. Under favourable conditions it grows rapidly, and produces a profusion of Whortleberry-like leaves and rosy flowers in September and October, when it is valuable in the rock garden. Himalayas.