FloraFlex Incubator - Outer Tray - Case of 30Case of 30 The Incubator Bottom Tray was engineered to house all FloraFlex Insert Trays and assist in propagating plants in their earliest stages of life. Use the full Incubator system for optimal results. To use simply place any FloraFlex Insert Tray into the Bottom Tray. The Bottom Tray provides airflow and lift to the Insert Tray, has an easy grab design for handling of the Insert Tray, optional cutoff tabs on the bottom corners for drainage, wider