Heather is an evergreen shrub which belongs to the ericaceae family.
They need a well drained and rich type of soil, better if it is a bit acid, and do not use manure. A good option is to use soil for acidophilous plants such as the ones for rhododendron, or azaleas.
Irrigation has to be frequent but without overweatering them so that the soil is not always wet and dump but only moist.
We better prune our heathers ones the flowers are over, which will depend on varieties. Can be late fall or in winter.
Regarding feeding use a special one for acidophilous plants if you consider your plant looks pale or weak.
Consulted sources in addition to our experience with this plant: