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Blayne Greiner, Instructor for the Chicago Botanic Garden’s Windy City Harvest urban agriculture program, gives us some tips from his recent class on seed starting. A lot of information was covered in this 3-hour workshop, so if this video still leaves you with questions, consider taking these courses. Visit to sign up for the next one.

View the video on YouTube here.

In case you missed it, here’s the recipe for blocking mix: 30 quarts brown peat, 20 quarts compost, ½ cup lime, 20 quarts coarse sand or perlite, 10 quarts soil, 3 cups organic fertilizer mix (blood meal, colloidal phosphate and greensand mixed together in equal parts).