Fertilizing a Century-Old Oak Tree

Owner of a 100-150 year old oak with dying branches and unhealthy leaves seeks a "food" to save it.

Fertilizer Recommendation

• 10-10-10 at 1 lb per inch of trunk diameter, scattered and watered in.
• Split application: half now, half in 2 weeks.
• Repeat in fall.

Critical Warning

Do not use "Weed and Feed" lawn fertilizer near the tree. It contains herbicide that will kill the oak.

Large trees need large fertilizer quantities; split applications prevent burn.