Rumex verticillatus aka Swamp Dock

Rumex verticillatus, or swamp dock, is in the knotweed family. The family's scientific name is Polygonaceae. This perennial is native to parts of North America. It lives for more than one growing season. Kew gives its range as southeastern Canada to northeastern Mexico. This range crosses country lines and climate zones. Kew places it in the temperate biome. Chicago Botanic Garden lists it as native to the Midwest. These records describe a native plant, not an introduced garden form.

Swamp dock grows upright and comes back across growing seasons. Chicago Botanic Garden lists its use as a specimen plant. This means using one plant as a point of interest. The account gives no height or spread for the plant. It gives no details about leaves, stems, or roots. These sources thus leave its full size and spacing needs unclear. This account does not cover any named cultivar.

Chicago Botanic Garden lists white and green flowers. It gives July and August as the months of bloom. The stated bloom time thus falls in summer. The page gives no flower size or details of flower form. It says the plant draws both birds and butterflies. It does not say which plant parts draw them. It names no pollinator and does not describe the fruit. The wildlife it draws does not show how it gets pollen.

For garden use, the garden lists full sun and partial shade. It also calls for moist soil. These notes support a site with sun or some shade. They support moist soil, but do not show a need for standing water. The name swamp dock alone does not prove that need. The garden gives USDA hardiness zones 2 through 10. It gives no soil texture, soil pH, or growth rate. It gives no advice on pruning or feeding, either.

The garden's page is an archived copy from before February 2022. Its care notes remain useful, but the page gets no more updates. Neither source reports pests, diseases, or other garden problems. Neither gives evidence of parts to eat or uses as medicine. These sources do not assess safety for people or pets. Do not take that lack of data as proof of safety. The sources support its value for upright form and summer bloom. They also support its use to draw wildlife.