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DoMyOwn is a great resource for this. For example, winter annuals like field horsetail and shepherd s purse germinate before any GDD accumulate in the spring; giant ragweed and common lambsquarters require fewer than 150 GDD and therefore emerge several weeks before corn planting; redroot pigweed, giant foxtail, and velvetleaf germinate at 150 300 GDD, close to corn planting time; whereas large crabgrass and fall panicum require over 350 GDD and usually emerge after the corn is up. The majority of seeds sprout within two to four days.  Source: <a href=http://www.illuminareleperiferie.it/2013/06/where-can-i-buy-hashish-seeds/>http://www.illuminareleperiferie.it/2013/06/where-can-i-buy-hashish-seeds/</a>