To answer some of your comments - As soon as the seeds germinate the shell cracks open and the tap root known as the radicle begins to show you can pop them into your substrate, coco is superior to soil IME 20 years growning. Plant the whole cube into your growing system once the seed has sprouted and the plants root s are coming through the bottom of the cube. Weeds seeds can be legally bought and sold in certain regions e.  Source: <a href=http://www.pwprowse.com/2013/06/21/weed-seeds-this-fall-means-extra-weeds-subsequent-spring/>http://www.pwprowse.com/2013/06/21/weed-seeds-this-fall-means-extra-weeds-subsequent-spring/</a>