Hmm..seems a bit odd Dan. I have WH in my new pond and it's doing better than yours, even this far north. Many people on here have warned me that it goes mad. Perhaps putting it in its own pot is the way to go...give it a bit of room. Worth a try.

Thankyou! I think that's what I'll do! At first I thought it may have been the fish eating it but they've not done, and if they'd been eating it they've had the waterlilies too which are sending up new leaves/pads, I think when the new ones arrive I'll pot them all together :)

I don't have any fish Dan, so perhaps that might be something to do with it. They might like the taste of it, I've no idea. Your pond looks great though...lots of lovely plants around it. Good luck this year with the new ones. Perhaps someone else will give you a better answer. :)

Thankyou!! Thankyou! And I'm not sure that it is the fish because they've not had anything else, the water lily may just be taking all of the goodness out of the aquatic compost in the pot that they share; when my new plants arrived I'll put them all together in their own pot!! I'm trying to get the rest of the edges around the pond looking nice and full. Can't believe it's (the pond) only 9 months old :)

What I know about water plants can be written on the head of a pin, but I just want to add my admiration - that's a really good looking pond area...

Out of curiosity, I looked it up - if you've got lots of water snails, they may be causing a problem. This plant is also listed as sub tropical?! Hardiness rating only H3, so unless you're not far from the sea, it might be a bit too cold for it - bit more info in the link below, might be useful, not sure

https://www.rhs.org.uk/plants/details?plantid=149

Thankyou! I've had a look at it this morning and placed it in a bucket of pond water, I think the reason it may be 'slow' on growth is because it was encased in roots from the water lily that doesn't even grow too well.

Thankyou for your kind comments on the pond area :)

I have had mine for years growing in a pot with other plants and its never caused any problems, I think you have answered yourself Dan, you disturbed it when you changed the pond, and therefore its not settled down yet, plants in our ponds can behave just like the ones in the garden, sometimes they'll accept a change and another time they don't, by all means try the new plants in a container of their own and see what happens but I wouldn't give up on the old one yet....My lilies were a complete failiure last year, not enough sunlight so no flowers, the hyacinths however were quite happy....

My lilies didn't take the move too well but they've bounced back, they've been fertilised with lily food and have been sending up a few leaves/ pads to the tops of their pots. The water hawthorn will all go together in one pot I've decided, fingers crossed it works.

Have faith Dan, LOL.its early yet and the poor plants are as confused as we are ...

They are! The frogs have been mating, but yesterday there was frost and one of them has died, sad thing is the other hasn't seemed to have noticed and is still 'with' it.