Plants in TUBES (see drawing) are generally 1-2 years old and from 3" - 3' tall, but average 6-12". The minimum order is one plant, but your shipping cost per plant goes down the more you order. Tubes have a good root sytem, generally as deep (4-5") as a Size:1 pot but are 2"x2" wide, making them much lighter (~1 lb) to ship.