Birch. Found an old photo from a couple of years after originally purchasing for $10 from Tien's clearance section (when he used to have one) it was in a plastic training pot Bulk Poppy Power Poppy Flower Seed Mix Bulk Wildflowers How to Grow Tomatoes in Containers Gardener's Path Amazon.com : Plant Saucer 4 Pack 10 inch Heavy Drainage Tray for Indoors No Holes, 12 14 16 18 20 25 Inch Plastic Plant saucers Water Catcher for Pots Base Extra Deep Plant 5 Gallon Nursery Pots Wilson Garden Bloem Terra Pot 20.5 in. x 20.5 in. x 17 in. Round Terra Cotta Plastic Plant Planter with UV Resistant Material