Is there anything special I should do for my water plants at the start of Spring?

As with all plants emerging after winter, they will enjoy a trim and a feed. The majority of water plants respond really well to a hard prune, removing any old and unattractive foliage will only encourage more new healthy growth. A light feeding will be well received, especially by the flowering varieties, such as Water Iris, Water Canna, Pickerel, etc. using a dedicated slow release water plant fertiliser.