Sativa has even been called a daytime head high. This allows indoor feminised seed growers to dictate the length of vegetative growth, which in turn will affect final plant size, yield and overall life cycle. The location of seeds in the weed seedbank is influenced by the tillage system.  Source: <a href=http://hungryforhits.com/myprofile.php?uid=34555&postid=17905>http://hungryforhits.com/myprofile.php?uid=34555&postid=17905</a>