Bur Oak Tree Seeds (Quercus macrocarpa)

The toughest oak in North America. Built for fire, drought, and centuries.

Quercus macrocarpa, the Bur Oak, is the most drought-tolerant, fire-resistant, and cold-hardy of all native oaks, the species that pushed furthest out onto the Great Plains ahead of every other forest tree and held its ground against the grassland fires, extreme winters, and summer droughts that define that landscape. Its bark is so thick it can survive fires that kill every other tree in a community. Its taproot drills so deep into the subsoil that it persists through droughts that desiccate the surface. Its acorns, the largest of any eastern oak with their distinctive fringed caps, are consumed by deer, turkey, bear, squirrel, wood ducks, and dozens of other species. If you are looking to buy Bur Oak seeds or grow this iconic prairie oak from seed, this is the tree that survived everything the continent could throw at it and came out stronger for it.

• The most fire-resistant and drought-tolerant native oak in North America
• Produces the largest acorns of any eastern oak, with distinctive fringed caps covering half the nut
• Extremely long-lived, with documented specimens regularly exceeding 400 years
• Cold-hardy to zone 2, the northernmost naturally occurring oak species in North America
• Deep taproot system allowing it to survive drought conditions that kill other oaks

Things you probably did not know about the Bur Oak

The bark can be 4 inches thick on old trees. The deeply furrowed, corky bark of a mature Bur Oak is among the thickest of any North American hardwood. This bark insulates the living cambium from ground fires so effectively that Bur Oaks on the forest-prairie border survived the periodic grassland fires that swept the Great Plains for thousands of years, while other species were repeatedly killed back and regenerated from roots. The Bur Oak did not regenerate. It simply did not burn.

It was the landmark tree of the American frontier. Early surveyors and settlers moving onto the Great Plains used isolated Bur Oaks as landmarks and meeting points because they were the most visible trees in an otherwise treeless landscape. The practice of recording Bur Oaks in survey notes as corners and reference points for land grants is documented throughout the public land survey records of the Midwest from the 18th and 19th centuries.

The acorns are low in tannins and were eaten by Indigenous peoples. Unlike most oak acorns that require extensive leaching to remove bitter tannins before they are edible, Bur Oak acorns have relatively low tannin content and were eaten raw or with minimal processing by Indigenous peoples across the Great Plains and Midwest. They were also ground into a meal and mixed with other foods. Bur Oak mast years were important food security events for communities across its range.

It can live on the same site for 500 years without replacement. Old-growth Bur Oak savannas on the Midwest prairie border contained individual trees 300 to 500 years old growing in grassland they had occupied since before European contact. Some of these trees witnessed the entire recorded history of European settlement in North America and were already ancient when it began.

Growing Details

• Botanical Name: Quercus macrocarpa
• Stratification: Required, 30 to 60 days cold moist stratification, recalcitrant seed, keep moist
• USDA Zones: 2 to 8
• Soil: Extremely adaptable, tolerates poor, dry, rocky, clay, or alkaline soils
• Light: Full sun
• Height: 60 to 80 feet
• Spread: 60 to 80 feet
• Growth Rate: Slow to moderate, 1 to 1.5 feet per year

Plant it where you want an oak that outlasts everything. Then stop worrying about it. It was doing this before anyone living today was born.