With minimal effort, many gardeners succeed in growing beautiful blackberry patches in a home garden. Because blackberries are perennial plants, once you establish a blackberry stand, it should flourish for years and produce many harvests of blackberries. Choose a sunny location to plant blackberry canes and amend the soil so it is rich and drains well for best results. Fertilize blackberries at the beginning of each growing season to ensure energetic growth and abundant berry production.
Prepare the growing area for the fertilizer in early spring when the blackberry plants break dormancy. Dig a 3-inch-deep trench approximately 1 foot away from each row of blackberry canes with the hoe.
Sprinkle the fertilizer along the prepared trench, applying approximately 5 pounds of fertilizer for each 100 feet of blackberry canes.
Cover the trench lightly with soil. Water the soil generously immediately to help the fertilizer soak into the soil.
Watch the blackberry plants as the growing season begins. If you notice yellow foliage and stunted growth, apply approximately 1.5 pounds of ammonium nitrate for every 100 feet of blackberry canes along the same trench line. Apply the ammonium nitrate when the blackberries begin to bloom, cover the trench lightly again and water the soil generously.