Plant Kiowa blackberries in spring, after the ground thaws. In zone 9 of Texas this may occur as early as March, while gardeners in North Texas may need to wait for April or May. Choose a site that gets full sun for at least eight hours a day, and complete drainage. Although blackberries may grow in partial shade, they won't bloom or fruit. Choose a site that is far removed from any other plants, as blackberries grow tall and may shade out other plants.
Amend the soil to a depth of 1 foot with a combination of half quick-draining soil and half organic compost. Blackberries require loose, deep soil that is quick to drain. Plant Kiowa blackberry bushes deeply enough to cover the entire root ball, and pack amended soil around the base of the plants for support.
Water the Kiowa blackberries with 2 inches of water. In cooler areas like North Texas, mulch the berries with 1 inch of organic mulch to maintain soil moisture and warmth. Expect Kiowa blackberries to fruit in their second year.