This is a vigorous annual herb up to 0.5m high and is found in Summer and all year round in tropical areas. Stems are generally rounded, may have some ridges, and glabrous (without hairs). Leaves are mid to light green and deeply veined and up to 15cm long. Leaves have a long leaf stalk and have a broad base tapering to a pointed tip.
Mostly the inflorescence (group of flowers/fruit) is a dense spike, often with many branches. Flowers are small and green (sometimes with a reddish tinge). Flowers are generally radiating around the stem. Fruit capsules are wrinkled, indehiscent (not opening to release seed when ripe), small and brown. The fruit contains smooth and glossy seeds.
Amaranthus viridis is suitable for : light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It prefers moist soil.