How to Fertilize Blackberry Bushes

1st Year Fertilizing: After the soil has settled, add 10-10-10 nitrogen fertilizer. You can purchase 10-10-10 nitrogen fertilizer at your local garden store.

Fertilizing after 1st year: Add actual nitrogen or a 10-10-10 nitrogen fertilizer, a higher amount added in the second year. When spreading the fertilizer, keep it several feet away from the base of the plant to avoid burning the roots.