The program is led by true cultivation experts and involves insightful course materials. How to control it You can control curly dock by tilling and uprooting this plant. Preen Extended Control Weed Preventer provides protection from new weeds for up to 6 months and is labeled for use around 600 plants in perennial flower beds; around groundcovers, trees, and shrubs; and in xeriscape settings and rock gardens.  Source: [url=https://www.papercall.io/speakers/102425/speaker_talks/264162-organic-seeds-for-natural-cultivation]https://www.papercall.io/speakers/102425/speaker_talks/264162-organic-seeds-for-natural-cultivation[/url]