Have not managed to find info on the web re water lilly propagation. We bought 10 potted water lillies 6 monyths ago and they are very feeble. Planted in gravel with slow release fertilizer( allegedly) We have now taken some mature plants from another pond - they have good roots and tubers . How should we introduce them to our pond? Pots/gravel/soil/fertilizer?????????? Any help would be appreciated.