H. Perennial & Old Fashioned Garden Plants & Flowers by John Wood
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Polygonum Brunonis - Hardy Perennial
Author: John Wood
Polygonum Brunonis Described.
Polygonum Brunonis - Knotweed; Nat. Ord. Polygonaceæ.
This is a dwarf species from India, but quite hardy. It is pretty, interesting, and useful. The flowers are produced on erect stems a foot high, and formed in spikes 3in. to 5in. long, which are as soft as down and smell like heather. The colour is a soft rose. These flowers spring from a dense mass of rich foliage; the leaves in summer and early autumn are of a pleasing apple-green colour, smooth, oblong, and nearly spoon-shaped from the narrowing of the lower part; the midrib is prominent and nearly white; the leaf has rolled edges, and is somewhat reflexed at the point. Let the reader closely examine the leaves of this species while in their green state, holding them up to a strong light, and he will then behold the beauty and finish of Nature to a more than ordinary degree. This subject is one having the finest and most lasting of "autumnal tints," the dense bed of leaves turn to a rich brick-red, and, being persistent, they form a winter ornament in the border or on rockwork. The habit of the plant is creeping, rooting as it goes. It is a rampant grower, and sure to kill any dwarf subject that may be in its way.
It may be grown in any kind of soil, and almost in any position, but it loves sunshine. If its fine lambtail-shaped flowers are desired, it should be grown on the flat, but, for its grand red autumnal leaf tints, it should be on the upper parts of rockwork. It is self-propagating, as already hinted.
The flowers prove capital for dressing epergnes. I had not seen them so used, until the other day a lady visitor fancied a few spikes, and when I called at her house a day or two later saw them mixed with white flowers and late flowering forget-me-nots—they were charming.
Flowering period, August to the time of frosts.
Japanese Knotweed (Fallopia japonica, syn. Polygonum cuspidatum, Reynoutria japonica) is a large, herbaceous perennial plant, native to eastern Asia in Japan, China and Korea. In North America and Europe the species is very successful and has been classified as an invasive species in several countries.
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