Choose the site where you will plant your red currants. Plant in partial shade. They need moist, damp soil, so they do well in clay soils.
Dig a hole that is slightly larger than the red currant's root ball. If you have sandy soil, mix in a 5-gallon bucket of peat moss with the soil you removed from the hole. Add granulated fertilizer to the bottom of the hole according to the manufacturer's recommended quantities. Scratch the fertilizer into the soil with a garden claw.
Plant the red currants. Place the root ball into the hole. Make sure the plant is placed at the same level at which it was growing in the container. It should be level with the surface of the surrounding soil. Add or subtract soil from beneath the root ball as needed to adjust this height. Fill in around the roots with the soil mixed with peat moss. Hold on to the plant and firm the soil with your foot so that no air pockets remain in the soil.
Use your hands to make a ridge of soil around the perimeter of the planting hole, forming a saucer-shaped depression. This will help catch water near the roots of the plant.
Water thoroughly. Fill the saucer-shaped depression with water and let it drain. Repeat. Provide your red currants with at least an inch of water every week.