Fertilization Schedule for Scuppernong Grapes

For established scuppernong (muscadine) vines, apply 3–5 pounds of 10-10-10 fertilizer per plant each March. In June, add ½ pound of ammonium nitrate per vine. Muscadines have a high magnesium requirement, so also apply 2–4 ounces of Epsom salts (magnesium sulfate) to young vines and 4–6 ounces to mature vines annually. This regimen supports vigorous growth and optimal fruit production. Always water in fertilizers thoroughly and consider a soil test every few years to adjust rates.