Acquire 12- to 15-inch Ebony King blackberry bushes in mid-spring, about one month before the date of the usual last frost in your area. Select a location for them in either full sun or partial shade, with well-drained and slightly acidic sandy soil. To avoid verticillium wilt, don't plant them in a site where raspberries, strawberries or plants from the solanum family -- such as potatoes, tomatoes, peppers and eggplants -- have recently grown.
Spread composted manure over the site at a rate of 2 bushels per 100 square feet. Till the compost into the soil.
Plant your Ebony King blackberry bushes 6 feet apart and at the same height they grew in their containers. Cut them back to 6 inches. Water them well, and make sure they continue to get at least 1 inch of water per week during the summer months.
Fertilize the berries about a month after you plant them. Scatter 4 ounces of a 10-10-10 chemical granular fertilizer or 8 ounces of a 5-5-5 organic granular fertilizer around the base of each plant. Scratch it into the soil, and mulch the plants with 4 inches of chopped bark, sawdust or straw.
Snip off the top 6 inches of each cane after the canes have grown to 3 feet, to encourage them to branch out.