Editing Weed control (section)

=== Seeds ===
[[Annual plant|Annual]] and [[biennial plant|biennial]] weeds such as [[chickweed]], annual meadow grass, [[shepherd's purse]], [[Senecio vulgaris|groundsel]], [[Chenopodium album|fat hen]], [[Galium aparine|cleaver]], [[Veronica (plant)|speedwell]] and [[hairy bittercress]] [[plant propagation|propagate]] themselves by [[seed]]ing. Many produce huge numbers of seed several times a season, some all year round. Groundsel can produce 1000 seed, and can continue right through a mild winter, whilst [[Scentless Mayweed]] produces over 30,000 seeds per plant. Not all of these will [[germinate]] at once, but over several seasons, lying dormant in the soil sometimes for years until exposed to light. [[Poppy seed]] can survive 80–100 years, [[Dock (plant)|dock]] 50 or more. There can be many thousands of seeds in a square foot or square metre of ground, thus any soil disturbance will produce a flush of fresh weed seedlings.