Marginal Plants:

EG: Iris

These plants should be planted around the edge of your water feature in a built up marsh area. The depth of the water should be around 10cm from the soil to water surface. Deep marginal plants like a water depth of about 15cm to 20cm.

Floating Plants:

EG: Water Lettuce, Azzola

These plants do not need to be planted in soil as they float on the water surface. If they grow too much they can be easily pulled out and trimmed. (NB: Water Lettuce does not survive southern Australian climates in Winter.)

Oxygenators:

EG: Valsanaria, Myrophylum Amphibium, Alodea

Their main function is to add oxygen to the water rather than to be an attractive addition to your pond. These plants will usually grow in any depth of water.