A large long-lived tree on good sites, with stout limbs forming a broad crown at maturity. Scrubby forms can be found on very dry sites. Native throughout all but the northwest corner of the state. Difficult to transplant because of a deep taproot. Bur Oak is also called Mossycup Oak. Once established trees grow one to two feet per year on favorable sites. The largest tree in North Dakota is 85 feet tall with a canopy spread of 61 feet.