With the wide variety of heather cultivars available to choose from, planning your garden so that it is beautiful even in winter should be easy. Heathers are hardy and not very demanding. They are also quite easy to plant and require no special treatment prior to planting. Once established, they may not even require additional fertilizing. Unlike many other plants, they do not require or even particularly like being mulched. Heather's only requirement, once planted, is that you prune it often to keep its growth in check.
Dig a hole where you intend to plant your heather. Dig just slightly deeper than the size of the root ball. Heather planting can be done any time the ground is not frozen.
Mix compost into the dirt you have dug out of the hole in a 1:1 ratio. Mix a little fertilizer into the hole as well, in whatever amount is recommended by the manufacturer. Fill the hole with this mixture, just enough so that the hole is now the size of your heather's root ball.
Place the heather transplant in the hole. Cover the top of the root ball very lightly with some of the soil/compost/fertilizer mixture. Do not compact, and do not cover deeply.
Water the heather plant deeply to help it establish itself. Do not overwater. If you see water pooling around the plant for a few moments before the ground absorbs it, stop watering.