The Westland Ericaceous Planting and Potting Mix is specially formulated with added zinc complete to enhance immunity and slow-release iron to ensure an acidic root environment. It effectively stimulates chlorophyll production, resulting in lusher and more vibrant foliage. With this ericaceous feed, you can enjoy the beauty of longer-lasting blooms. Westland Ericaceous Planting & Potting Mix has been specially blended with added zinc complex. This helps to naturally support plant health.