Westland Ericaceous Planting & Potting Mix has been specially developed to give gardeners the ideal medium for lime hating plants. 6-month slow-release feed for sustained growth Slow release iron to maintain acidic root environment Promotes chlorophyll production for greener as well as glossier foliage Added zinc complex helps build plant resilience Westland Ericaceous Planting & Potting Mix has been specially blended with added zinc complex. This helps to naturally support plant health for an abundance of stronger, healthier acid-loving plants such as rhododendrons, azaleas and also camellias.