Photo: Mason Brock (Masebrock), Public domain · Wikimedia Commons
Blue Ash
Fraxinus quadrangulata
The one ash worth planting: square twigs, limestone-loving roots and real tolerance of emerald ash borer.
RareDrought tolerantFall color
- Type
- Large tree
- Mature height
- 50–70 ft
- USDA zones
- 4–7
- Growth rate
- Medium
- Sun
- Full
- Soil moisture
- Dry · Average
210
Blue ash survives emerald ash borer at far higher rates than green or white ash, and in Ohio and Michigan it is often the last ash standing. It is a tree of dry limestone slopes and glades from Ontario to Tennessee, with distinctive four-angled twigs and inner bark that turns blue in water. Plant it as a hedge against losing the genus.
Heights and zones are typical ranges for the species in cultivation; local conditions and seed source shift them. Estimate growth for this species →
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