Hemlock Tree Identification: Needles, Cones, Look-Alikes

You can identify a hemlock by turning over a twig. Save MI Hemlocks and the Maine Forest Service describe the needles as flat, attached one at a time, with two white "racing stripes" on the underside. They are short: Save MI Hemlocks gives normally under 1/2 inch, the Vermont Land Trust about 1/2 inch, and Wikipedia 15 to 20 mm for eastern hemlock.

Two more details confirm it:

• Each needle sits on a tiny stalk rising from a raised bump on the twig (Maine Forest Service).
• The needles spread mostly in one flat plane, making the twig look flat and lacy (Maine Forest Service). Save MI Hemlocks adds they are blunt, with a few tiny teeth near the tip.

Cornell Small Farms notes some needles also lie along the top of the twig, and that crushed hemlock foliage smells "piney" without the citrus note of fir.

From a distance, a mature eastern hemlock is a dark green, broadly conical tree with fine, drooping branches. Save MI Hemlocks notes it often looks darker than pines, with droopy, lacy branches. The Maine Forest Service adds that the topmost shoot often bends away from the prevailing wind, and Cornell notes the leader commonly droops.

Wikipedia gives a typical height of about 31 m (102 ft), exceptional trees to 53 m, trunks often 1.5 m across, and many trees living more than 500 years. The Vermont Land Trust says hemlocks often grow in dense stands along streams and on cool north-facing slopes.

The bark is cinnamon red to gray with narrow, scaly ridges (Maine Forest Service). The Vermont Land Trust notes the inner bark is reddish-purple, the reason hemlock bark was used commercially for tanning leather from the early 1600s into the early 1900s. The cones are small and hang down: Cornell calls them marble-sized, and Wikipedia gives 1.5 to 2.5 cm.

• Balsam fir: the most common mix-up, especially on small trees (Save MI Hemlocks). Both have flat needles with two white stripes. Fir needles are about 1 inch, roughly twice as long, and attach with a round base like a suction cup; crushed, they give the classic balsam smell (Vermont Land Trust).
• Yew: single needles very like hemlock, but without the white stripes underneath and longer; yew bears berry-like cones rather than woody cones (Maine Forest Service; Save MI Hemlocks). This distinction matters because yew is highly toxic, see below.
• Douglas-fir: the twig is smooth with no raised bumps, and the needles spiral around the twig instead of lying flat (Maine Forest Service).
• Pine: needles in bundles of 2, 3 or 5 (Cornell). The Vermont Land Trust notes white pine bark looks like hemlock bark but is darker and thicker.
• Spruce: four-sided single needles on woody pegs (Cornell).

The name causes real confusion. Wikipedia explains that the tree was called "hemlock" because its crushed foliage was thought to smell like the unrelated plant hemlock, and states that Tsuga species are not poisonous. The deadly "hemlock" of history is poison hemlock, Conium maculatum, a tall herb in the carrot family with purple-blotched stems. See our poison hemlock identification page.

The real risk with a hemlock tree is misidentifying a yew. The ASPCA lists yew as toxic to dogs, cats and horses; its toxic principle is taxine, and signs can include sudden death from acute cardiac failure, with early signs of tremors, difficulty breathing and seizures in dogs. Wikipedia notes tea has been made from eastern hemlock needles; even so, do not chew needles or make tea from any conifer unless an expert has confirmed the tree. If a person swallows yew or an unknown plant, call Poison Control at 1-800-222-1222; for an animal, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435.

While you have a twig in hand, look at the base of the needles on the underside. Save MI Hemlocks describes hemlock woolly adelgid as a white, woolly mass attached at the base of the needle; the Vermont Land Trust calls it white fuzzy stuff around the needle bases. Wikipedia calls this invasive Asian insect the greatest current threat to eastern hemlock. Save MI Hemlocks notes it is often spread by birds during spring migration, so infestations often start at the top of the tree. If you find it, photograph it and report it to your state forestry agency or local invasive species group.

Research and drafting for this page used AI assistance. Every measurement, date and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.