B and T World Seeds' reference number: 77875
USDA average, annual, minimum temperature Zone:5
Type of plant - perennial
Flower: PINK or RED, dense spikes
Fruit: achenes in 2-3mm. pod
Foliage: oblance, 7-10cm. long.
Height in meters: 1

Synonyms (alternative names) for Polygonum amphibium: Persicaria amphibia, 

Common names for Polygonum amphibium: Coban Deynegi,  Hartwright's Persica,  Hartwright's Persicaria,  Poligono Anfibio,  Renouee amphibee,  Serpentine,  Willow Grass, 

Polygonum amphibium is included in the following B and T World Seeds flowering plant categories:
12:   British Native Wild Flowers Shrubs and Trees
56:   Aquatic and Semi aquatic Plant Seeds
77:   Central European Native and Introduced Plants
78:   South Eastern European Native and Introduced Plants
80:   South West European Native and Introduced Plants
100:   North East European Native Plant Seed List
101:   North West European Native Plant Seed List
102:   Eastern European Native Plant Seed List
103:   Western European Native and Introduced Plants
124:   Greenland Native Plant Seed List
180:   Aquatics Used For Water Treatment
574:  Polygonaceae

Germination guide
Polygonum amphibium seeds will usually germinate in 21-60 days, even under good conditions germination may be erratic. Sow seeds about 2mm deep in a Peaty seed sowing mix at about 22°C.

Do not overwater