This is an experiment in raising microgreens without dirt, chemicals or synthetic media with our Bioponica garden system. The bed itself is optimized for 10" standard sized trays. The water levels are set to fill to the top of the rocks and can be adjusted with drain valve to any level. I am using burlap as a saturation media to keep moisture close to seeds. On top of the burlap is fiberglass screen. This keeps seeds off the burlap, adding an air layer so they don't mold. It also allows roots to be easily separated; the screen keeps roots separate from stem and also easy to pull up from beds without losing plants to the rocks when trays are lifted from the bed. No dirt means no dirt on the microgreens and a lot less cost and labor in handling. These materials are entirely recycled and reused. Burlap is dried, fiberglass is stable, safe for fish and people too. Seeds set on top of this layer are sandwiched between the bottom and a second covering screen. I put the rocks on top to keep the pressure evenly onto the burlap so all seeds germinate simultaneously. These trays are growing mustard greens, alfalfa, dill and fennel. Next we're doing celery and clover. I'll be reporting on the yum factor as they spring to life. The mustard seeds were nice like spice.
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