Fertilizing Forest Oaks for Better Acorn Production

Acorn Production Factors

• Weather during pollination (wind-pollinated; dry, calm springs favor set).
• Internal cycles (masting)—heavy crops alternate with light years.
• Species group: White oaks mature in 1 year; red/black oaks take 2 years.

Fertilization Protocol

• Fertilizer: Complete (e.g., 8-12-12) broadcast evenly from near trunk to dripline.
• Rate: 2 lbs per inch trunk diameter (DBH).
• Timing: March (South) / April (North).
• Zinc supplement: 3–5 lbs zinc sulfate per mature tree (pecan research shows nut yield increase; may help oaks).

Important Notes

• Fertilizer affects current year's white oak crop and next year's red oak crop.
• Trees near fertilized lawns/pastures often have heavier crops.
• Don't over-fertilize—excess nitrogen favors foliage over mast.