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Also know, when can I transplant water lilies?
Spring is the ideal time to repot fleshy water lilies into slightly larger pots, helping them to grow better. Repotting with fresh compost increases nutrients to the plant, while a larger pot stops the roots from becoming congested. Once you've repotted your lily, gradually reintroduce it to the pond, over a few weeks.
Just so, can you propagate water lilies?
Water lilies are some of the most widely recognized and beautiful of pond plants. There are many varieties, and most are propagated by means of rhizomes. Plant propagation from leaves and flowers of a plant is called viviparous reproduction, and you can do it in your own pond as long as you have an appropriate variety.
The flower buds dying off may be from the same reason as the leaves. So water depth is very important. It could also be a combination of factors such as parasites, rot and water quality. Water lilies do not like high pH, (over 9.0 makes some varieties go dormant).