Description
Persicaria – Aconogonon – Bistorta – Polygonum – Tovara – Fleeceflower – Knotweed –
There are 50-80 species of vigorous annuals, often rhizomatous or stoloniferous perennial, and rarely subshrubs in the Polygonaceae family in this genus. They may be evergreen, semi evergreen, or deciduous, some with attractive red and gold autumn color. They are found in a variety of habitats worldwide. Often spreading and sometimes invasive, they have usually fleshy stems and simple, smooth edged, veined leaves: basal leaves are long stalked, stem leaves are fewer, smaller, alternate, and stalkless that are rounded, lance, or heart shaped and 1 ½-10″ long, depending on the species. It bears spikes or panicles of small, usually long lasting, funnel, bell, or cup shaped, white, pink, or red flowers are followed by distinctive, usually brownish red, 3 angled or ovoid fruits. Some of the larger perennials are undemanding plants for a border, or as a groundcover, and are suitable for naturalizing in a meadow or woodland garden. Grow smaller species in a large rock garden. Grow smaller species in a large rock garden, or at the front of a border. Contact with all parts may irritate skin, the sap may cause mild stomach upset if ingested.
Grow these easily cultivated plants in any moist soil in full sun or partial shade. Divide in spring or fall.
Prone to aphids, slugs and snails.
P. campanulata – Polygonum campanulatum – Lesser Knotweed – This clump forming, stoloniferous, deciduous or semi evergreen perennial from Northern India, Northern Myanmar and Southwestern China grows 36″ tall and wide. It produces few lance shaped basal leaves, to 6″ long and numerous stem leaves, all are hairy, with conspicuous veins, and are bright green above, white or light brown beneath. From mid summer to early autumn, slender erect stems, 2-4″ tall carry loose, panicles, 6″ long of bell shaped, fragrant, pink or white flowers, 1/4″ long.
Zones 5-8
