Birches Betula

Ohio State's Firewise Landscaping bulletin gives low-flammability ratings to river birch and yellow birch. The yellow birch recommendation also notes poor tolerance of heat and drought and a need for a suitable Ohio site. Ohio gives European white birch (Betula pendula) a low rating too. Corbett's Safer Gardens sample reports a different finding from Sheridan's green-leaf testing: the same species was classified very flammable. That is a reported experimental result, distinct from Ohio's landscape-list judgment.

Paper birch (Betula papyrifera) presents another distinction. The Forest Service's 1991 review says fires generally kill or top-kill its trees because thin, flammable bark leaves trunks susceptible to girdling even in light surface fires. Older bark becomes more flammable as it exfoliates.

The Pacific Northwest guide includes birches in fire-resistant landscapes under its watering, maintenance and spacing guidance. That garden recommendation does not erase the species-level disagreements or turn paper birch's response to fire into a promise of survival.