When you have read enough and want to start growing ASAP, you should browse our seeds for beginners to make sure you get the right seeds for your first grow. Cannabis seeds should be germinated in dark conditions and don t need any nutrients initially. To control crabgrass, you ll need to address the issue in spring when the plant is most vulnerable. Source: http://niyalab.com/weed-seeds-this-fall-means-extra-weeds-subsequent-spring/