When do you use ericaceous compost?

Autumnal, spring, and summer fertilization schedules is the time to use ericaceous compost. The compost in question references the needs of plants that prefer soils more in the acidic soil pH ranges and that respond disastrously to lime treatments. It responds therefore to the requirements of such Ericaceae plant family members as azaleas, heathers, heaths, magnolias, and rhododendrons.