trefle.io · Taken Sep 1, 2022 by John Thompson (cc-by-sa)
Polygonaceae
Oval-leaf knotweed
Polygonum arenastrum
Also known as Prostrate knotweed, Doorweed, Oval-leaved knotweed, Polygonum microspermum
Native Plants · Knotweed · Ground Cover · Compacted Soil · Weed · Pollinator · Bird Seed · Disturbed Habitat · Low Growing · Perennial · Polygonaceae
Oval-leaf knotweed is a tough, low-growing annual or perennial weed commonly found in compacted soils, pathways, and disturbed areas across a wide geographic range. It requires very little care and can tolerate poor soils, foot traffic, and variable moisture conditions. While rarely cultivated intentionally, its small flowers attract pollinators and its seeds provide food for ground-feeding birds.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water lightly; tolerates dry spells once established · Every 10-14 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 5.5–6.5
- Temperature
- -20°F to 85°F
- Cycle
- Perennial
- Propagation
- Seed, Cutting
Hardiness
USDA 5a-10b
Form & growth
Mature size and habit
- Mature height
- 12 in – 3 ft
- Spread
- 2 ft
- Spacing
- 6 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- No
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Afghanistan, Alabama, Alaska, Albania, Alberta, Algeria, Altay, Amur, Arizona, Arkansas, Austria, Azores, Baleares, Baltic States, Belarus, Belgium, British Columbia, Bulgaria, Buryatiya, California
- Attracts
- Bees, Birds
Sources: trefle, usda
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