The Super Sprouter? Simple Start? Micro Greenhouse Kit is great for smaller projects. Ideal for separating plant or seed stock. This kit includes an 8 in x 12 in grow tray, 24-site tray insert pre-filled with Grodan? MacroPlugs, a 4 in humidity dome with adjustable vent and the Super Sprouter? Art of Propagation booklet with expert growing tips. This product is great for small spaces, or you can fit two on one Super Sprouter? Seedling Heat Mat. Make it simple with the Simple Start? Micro Greenhouse Kit.