Tobacco weed

Description:
Slender, fast-growing herb up to 150cm tall.
Leaves are oblong or oval, 10-20cm long, 2-5cm wide, mostly at base of plant.
Leaf upper surfaces are rough, thinly covered in fine hairs.
Leaf undersurfaces are densely haired, resinous, especially on veins. flowers are small, white, many-headed clusters at tips of stems and side shoots.
Leaf-like bracts are in cup of three each cluster.
Flowers are tubular, 5 lobes at apex, about 4mm long.
Stems are mostly erect, sparsely branched, becoming woody at base when mature,
Stems have fine white hairs that may cause skin irritation when brushed against.
Seeds are brown to greyish-black, 3mm long, each with 5 fine, straight, white, bristle-like hairs on top.
Smothers healthy, thick pastures with dense masses of broadleafed seedlings.

Life cycle:
Seeds germinate any time of year in sufficient moisture.
Flowering may also occur all year, but generally in May.
Germination to reproduction time and time ungerminated seeds remains viable are not known; however, field observations indicate that seed banks build up in soil.