and Deciduous Forest Trees

of Southern Ontario

Pin Oak
Quercus Palustris

Location in Ontario:
Pin Oak is a Carolinian Tree found in Essex County and the Niagara region.

Pin Oak, Ojibway Prairie, Essex County

Genus Quercus: The ten Oaks of Southern Ontario are divided into two categories. Red Oaks have lobed leaves which are pointed and White Oaks have leaves with rounded lobes or simple leaves with sharp teeth. Often, Oak leaves stay on the tree over winter. Oak leaves on the ground are slow to decay, as this is a survival strategy to prevent the growth of other plants nearby. Oaks are monoecious with male (pollen) flowers and female (seed) flowers on the same tree. Oak seeds are acorns. Oak wood is  favoured for flooring and furniture.

8 Oaks of University of Guelph Arboretum
L to R: Shumard, Hill's, Bur, Chinquapin, Dwarf Chinquapin, Red, Swamp White, White. Missing: Black Oak and Pin Oak

Oak Savanna, Turkey Point Provincial Park

Habitat: Pin Oak grows along rivers and swamps.

Landscape Use:
Pin Oak is a medium sized tree with a relatively fast growth rate. It is named "Pin" Oak for the small branches that stick out from the trunk. Oak leaves do not decay readily and persist beneath the tree along with acorns.

Leaves: Pin Oak has simple leaves with 7-9 pointed lobes, with deep, wide notches.


Flowers: Oaks are monoecious with male (pollen) flowers and female (seed) flowers on the same tree. Flowers are small. Pollen flowers are in catkins, while seed flowers occur in small clusters.

Fruit: Oak seeds are acorns; a one-seeded nut with a tough shell. On top of the acorn is a scaly cup which attaches to the tree. Acorns occur every year after 20 years of growth.

Bark: The bark is grayish-brown with narrow ridges. Small branches stick out from the trunk.

Pin Oak with branchlets sticking out from the trunk

Size: This medium sized tree grows up to 25 metres. Oak wood has a beautiful grain. It is used for furniture and flooring.

Wood: Oak wood is hard and heavy.
Specific gravity: 0.58
Janka Hardness: 1500 lb
Wood Comparison Chart

Pin Oak, Ojibway Prairie