Pin Oak
Quercus palustris

Location in Ontario
Pin Oak is a
Carolinian Tree found in Essex County and the Niagara region. It
grows along rivers and swamps.  

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 acorns (seeds) that develop over two years. White Oaks have leaves with rounded lobes or simple leaves with sharp teeth and acorns (seeds) that develop over one year. Acorns are a one-seeded nut with a tough shell, and a scaly cap which attaches to the tree. 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 is a favoured wood for flooring and furniture.

Recommended Book:
Logan, W. B. (2006). Oak: the frame of civilization. New York: W.W. Norton & Co.

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

In the Landscape
Pin Oak is a medium sized tree that grows up to 25 metres and lives to be 100 years of age. It has a relatively fast growth rate and unusual "pins" which are small branches that stick out from the trunk. Oak leaves do not decay readily and persist beneath the tree along with acorns.

Pin Oak, Ojibway Prairie

Pin Oak has simple leaves with 7-9 pointed lobes, with deep, wide notches. Leaves turn red in the fall.
The bark is grayish-brown with narrow ridges. Small branches called pins stick out from the trunk.
Pin Oak is monoecious with male (pollen) flowers and female (seed) flowers on the same tree. Flowers are small, contained in catkins or small clusters. Flowers occur with the leaves. Pollination is by wind.
Pin Oak develops acorns after 15 to 20 years of growth and develop over two years. Acorns are small and short in length. Good crops are produced every two or three years.

Pin Oak wood is hard and heavy with a beautiful grain. It is sold as Red Oak and is used for furniture and flooring.
Specific gravity: 0.58
Janka Hardness: 1500 lb
Wood Comparison Chart

Pin Oak with branchlets sticking out from the trunk

Link to United States Forest Service Silvics Manual for Pin Oak.