Raywood Ash Slow Growth: Addressing Root Girdling and Fertility

Why Your Raywood Ash Trees Aren't Growing

If your Raywood ash trees have shown little growth since 2011 planting, two common issues may be at play: root girdling and nutrient deficiency.

Root Girdling: A Hidden Killer

Container-grown trees often develop circling roots that, if not corrected at planting, eventually strangle the trunk. Symptoms include:

• Stunted growth and sparse canopy.
• Early fall color or leaf drop.
• Trunk appears to go straight into ground without a visible root flare.

Solution: Carefully excavate around the base to expose the root flare. Cut any circling or girdling roots with a sharp chisel or saw. This is best done when the tree is dormant (late fall to early spring). See OSU Extension guide on girdling roots.

Fertilization to Stimulate Growth

Once root issues are addressed, fertilize to boost vigor:

• Apply 10-10-10 fertilizer at 1 lb per inch of trunk diameter.
• Scatter evenly under the canopy, starting 1 foot from trunk.
• Water in thoroughly, or apply before a soaking rain.
• Repeat annually in early spring until growth improves.

Water Management

Raywood ash prefers well-drained soil. If the lawn is heavily irrigated, the trees may be overwatered. Reduce irrigation frequency but increase depth to encourage deep rooting.

Monitoring

After corrective actions, expect visible improvement within one growing season. If no response, consult an arborist for deeper diagnosis (soil compaction, pH, pathogens).