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Weak Points of couch Grass
1. Couch grass is shallow rooted, no long taper like roots going deep into the ground. The roots of couch grass typically go down about 10cm (4in) and rarely more than 15cm (6in).
2. If the soil is well-dug, the roots of couch grass can be pulled out with relative ease.
3. Digging of the soil weakens couch grass.
4. Couch grass produces less seed than most grasses