Blackjack Oak is a small, scraggly oak of the driest, most impoverished sandy and rocky soils in the central and eastern United States. Its distinctive three-lobed leaves are wider at the tip than the base, making them unmistakable. It is a stress-tolerant species that thrives where other oaks fail, often growing with post oak in 'Cross Timbers' habitat.
Best time to see a Blackjack Oak
The best time to see a Blackjack Oak is March–August, when about 63% of U.S. sightings happen, based on 11,759 research-grade iNaturalist observations.
Not certain it is a Blackjack Oak? What plant is this? walks through what to check first and the lookalikes that catch people out.
Recent Blackjack Oak sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spot a Blackjack Oak? Identify it instantly.
Point Huck at any plant, bird, or animal for an instant ID, its rarity, and a live map of where it is being seen near you.
Get HuckGet an alert when a Blackjack Oak is spotted
Pick a park, state, or city and we’ll email you when one turns up there. One check a day, only when there’s something new.
Free. Unsubscribe from any email. See our Privacy Policy.
Love plants? Get Huck field notes
Spotting tips, new species, and the best of what people are finding in the wild - straight to your inbox.