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Article Contents. However, significant numbers of seed of these species remained four years after burial. I have managed to drive down the seed bank using solarization, mulching, hoeing and hand pulling.  Source: [url=https://www.papercall.io/speakers/102425/speaker_talks/264135-discreet-and-secure-packaging-options]https://www.papercall.io/speakers/102425/speaker_talks/264135-discreet-and-secure-packaging-options[/url]