Outdoor Growing. Tillage events confined to the top 10 cm can provoke greater weed emergence than the corresponding events usually observed in untilled soil Egley, 1989. Grown outside, automatic seeds can produce two or more crops in the course of a normal summer.  Source: [url=https://www.trade-forums.co.uk/thread/11835]https://www.trade-forums.co.uk/thread/11835[/url]