Polygonaceae
Prostrate knotweed: Ground Cover Plant
Polygonum aviculare
This plant essentially takes care of itself, thriving in poor, compacted soil under full sun with little to no water once established. It needs no fertilizer and no regular pruning. It is more often managed as a weed than cultivated, but can serve as tough ground cover or be harvested for food and traditional medicine.
Every 10 days
Bright indirect
-10° - 35°C
% - %
Categories
What is Prostrate knotweed?
Prostrate knotweed (Polygonum aviculare) is a easy-care plant from the Polygonaceae family. Prostrate knotweed is a low, mat-forming annual weed frequently found in compacted soils, sidewalk cracks, and heavily trafficked paths. It has wiry, branching stems with small blue-green lanceolate leaves and produces tiny green flowers edged in white or pink from summer into fall, followed by smal...
Prostrate knotweed grows up to 30cm, spread of 100cm, watering every 10 days, -10°C – 35°C. It is not suitable for indoor environments and safe for pets.
Unlike many tropical plants, Prostrate knotweed tolerates watering mistakes. Best for beginners. Unlike many popular species, Prostrate knotweed is safe to keep around pets.
How to Care for Prostrate knotweed?
TLDR: Prostrate knotweed needs Bright indirect, watering every 10 days, and temperatures between -10-35°C with 40-70% humidity.
How Often Should You Water Prostrate knotweed?
Rarely needs watering; highly drought tolerant and prefers soil to dry out between any waterings. Only water newly germinated plants during extended heat.
How Much Light Does Prostrate knotweed Need?
Grows best in full sun but tolerates partial shade, thriving in almost any exposed location.
What Is the Best Soil for Prostrate knotweed?
Tolerates sandy, clay, or poor compacted soils, including sidewalk cracks and trampled paths; does not require fertile soil.
What Pot Should You Use for Prostrate knotweed?
Not typically grown in decorative pots; when kept intentionally, prefers open beds or direct garden soil with good drainage.
What Is Prostrate knotweed and Where Does It Come From?
Prostrate knotweed is a low, mat-forming annual weed frequently found in compacted soils, sidewalk cracks, and heavily trafficked paths. It has wiry, branching stems with small blue-green lanceolate leaves and produces tiny green flowers edged in white or pink from summer into fall, followed by small dark seeds. Extremely tough and adaptable, it is one of the most widespread and cosmopolitan weeds in the world, thriving where few other plants can survive.
How to Propagate Prostrate knotweed?
Seed propagation
- Self-seeds freely and can become weedy
- No special stratification needed in most temperate climates
- 1 Collect mature seed
Gather the small dark seeds from plants in late summer or fall once they have dried and darkened.
- 2 Sow directly on soil
Scatter seed over compacted or poor soil; the plant germinates readily without special soil preparation.
- 3 Wait for germination
Seeds germinate on their own with ambient moisture, typically within 1 to 3 weeks.
Materials needed:
How Big Does Prostrate knotweed Grow?
TLDR: Prostrate knotweed can reach up to 30cm tall with Fast growth rate.
Max height
30cm
Spread
1.0m
Growth rate
Fast
Foliage
Deciduous
Plant Uses
Edible
Can be consumed
Medicinal
Medicinal properties
Ground Cover
Soil coverage
Medicinal Uses
- Astringent
- Diuretic
- Anti-inflammatory
- Traditionally used for respiratory and digestive complaints
- Haemostatic (helps stop minor bleeding)
Culinary Uses
- Young leaves eaten raw or cooked as a potherb
- Seeds used as a partial flour substitute
- Leaves used as a tea substitute
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Prostrate knotweed?
TLDR: Prostrate knotweed is susceptible to 5 known diseases. Monitor regularly for early detection.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
Thrips
Thrips are tiny cigar-shaped insects (1/25-inch long) that damage plants by sucking plant juices and scraping at fruits, flowers, and leaves. With over 6,000 species and rapid reproduction (lifecycle as short as 14 days), they can quickly infest plants and transmit viruses like tomato spotted wilt virus.
Root-Knot Nematodes
Root-knot nematodes (Meloidogyne species) are microscopic roundworms that parasitize plant roots, causing characteristic galls or knots. These soil-borne pests are among the most economically damaging plant pathogens worldwide, affecting a wide range of ornamental and edible plants. The nematodes inject enzymes into root cells, causing abnormal swelling and disrupting water and nutrient uptake.
Leaf Spot
Leaf spot is a common fungal disease caused by various pathogens including Alternaria, Ascochyta, Colletotrichum, Septoria, and Venturia. It primarily affects leaves, causing discolored spots that can lead to premature leaf drop if left untreated.
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Field Maple | Easy | Bright indirect | 14d | ✓ |
| Silver Birch | Easy | Direct sun | 14d | ✓ |
| Common Blanketflower | Easy | Direct sun | 10d | ✓ |
| Cushion Bush | Easy | Direct sun | 14d | ✓ |
