the soil sometimes for years until exposed to light. Poppy seed can survive 80-100 years, 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.

Subsurface/surface

The most persistent perennials spread by underground creeping rhizomes that can regrow from a tiny fragment. These include couch grass,

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