Does "leaves of three, let it be" help you spot poison sumac?

No, poison sumac usually has clusters of 7 to 13 leaves.

  1. Yes, sumac has three leaves
  2. Yes, but only in winter
  3. No, sumac has 7 to 13 leaves ✔

Why: NIOSH says the old rhyme helps you spot poison ivy and poison oak, but not poison sumac, which usually has clusters of 7 to 13 leaves.

Huh, didn't know that: NIOSH says these poisonous plants grow throughout the United States except Alaska and Hawaii.

The dad joke
What did the poison ivy say to the hiker? I've got my rash eye on you.
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Sources

  1. Poisonous Plants (CDC NIOSH) https://www.cdc.gov/niosh/outdoor-workers/about/poisonous-plants.html

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