Pre-season essentials for successfully starting your gardening indoors. Burpee Ultimate Growing System-Kit includes watering tray, plant stand, 72-cell plant tray, self-watering mat, 72-Burpee Super Growing Pellets and 12 convenient plant markers. Seedling Heat Mats-Distributes heat evenly to germinate and grow your seeds quickly (9" x 19 1/2").