King British Plant Food is specially developed formula which includes essential nutrients in the form of trace elements required by aquatic plants to encourage healthy growth. As well as adding to the beauty of your pond plants also help improve water quality. By absorbing nitrate plants utilise the nutrients that would otherwise result in unwanted algae growth. Aquatic Plant Food does not contain any nitrate or phosphate that would otherwise encourage unwanted algae growth. King British Plant Food is suitable for use in ponds. King British Guidance, Use Aquatic Plant Food: When planting up your pond plants it is important to use good quality specialist aquatic compost. It is not advisable to use multi-purpose compost as the higher levels of nitrogen can lead to algae growth. Use Aquatic Plant Food: At two-weekly intervals during the growing season from March to October.