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Exhaust perennial roots

Many perennial weeds have deep storage roots or rhizomes that resprout after the tops are cut or pulled (e.g., hedge bindweed, Canada thistle. etc.). Since the storage roots or rhizomes are too deep in the soil to damage with normal spading or rototilling, your best hope for organically controlling these weeds is to exhaust the storage organs by repeated removal of top growth. Generally, the net flow of nutrients is from the root until formation of the third or fourth leaf, so time your removals accordingly. Typically, eradication of deep-rooted perennials requires about 6-8 well-timed weedings the first year followed 3-5 the second.