A system and method for growing and protecting tree seedlings is provided. The system includes potting tubes that may function as a pot for growing seedlings and additionally as a tree guard for protecting transplanted tree seedlings from pests. The potting tubes are open at both ends and may be secured to a bottom end cap for use as a pot. After a growth period, the end cap can be removed and the tree can be transplanted with the tube surrounding the tree for use as a tree guard. The system includes a tray with end caps attached to the tray for transporting and transplanting large numbers of tree seedlings.
