Some plants do not like growing in soils that contain lime. The most common ones are rhododendron, heathers, camelia and azalea. Blueberries fall into this category also. These are classified as ericaceous plants. They need composts that have a low pH. Erin Excel Ericaceous compost is specially formulated with the correct pH for lime hating plants. Our unique formulation will ensure the best results every time. Improved growing performance with Erin Excel formulation. Improved wetting agent for easy watering.