How Can You Tell a Blackjack Oak From a Post Oak?

The blackjack oak (Quercus marilandica) and post oak (Quercus stellata) are two very different looking oaks. The blackjack oak is a small to medium-sized oak that typically has a short, squat appearance. The post oak, on the other hand, is a large oak that can grow up to 100 feet tall! So, how can you tell these two oaks apart?

One of the easiest ways to tell a blackjack oak from a post oak is by their leaves. Blackjack oaks have dark green, glossy leaves that are deeply lobed. Post oaks have dull green leaves that are either unlobed or only lightly lobed. Another way to tell these two oaks apart is by their acorns.

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PRO TIP:Blackjack oak trees have smooth, dark gray bark while post oak trees have light gray, scaly bark. Blackjack oaks also have more round-tipped leaves with bristle-like hairs on the underside, while post oaks have more pointed leaves and the underside is smooth. Finally, blackjack oaks produce acorns that are about 1/2 to 3/4 of an inch in size, while post oaks produce acorns that are 1 to 1 and 1/2 inches in size.

Blackjack oaks have acorns that are about 1/2 inch long with a deep cup. Post oaks have acorns that are about 1 inch long with a shallow cup.

So, next time you see an oak, take a closer look and see if you can tell if it’s a blackjack oak or post oak!.