Asian Skunk Cabbage not thriving

Not to be confused with the invasive yellow skunk cabbage.
This is the white one, Lysichiton Camtschatcensis. I bought it about early March and nestled it into pebbles on my beach area of my wildlife pond. I put a couple of pond feed balls under it, the type you put in water lily baskets.
I have had some problems with pigeons (who hasn’t), they come onto the beach to have a drink and a bathe and they managed to snap off a few green leaves.
So I have done two things: replaced my bird feeders well away from the pond to distract them somewhat, this has worked to an extent; I also made a temporary basket from chicken wire, to place around the plant to give it a chance to grow new leaves.
If you look at the photo, it isn’t thriving at all. Newer leaves are very slim and it’s obviously not happy where it is. It’s in full sun but always has its bottom and roots in water.
RHS says grow in fertile, humus rich soil at pool margins. I’m not sure how to recreate that in a pond where I’m trying to keep down nutrients. Not even sure what humus rich soil is, I thought it was a dip made from chick peas
But seriously, I would love to make this plant happy and the idea was to have it spread across the beach area.
Any ideas? Thank you.

 

Dont know much about it, if anything, but I think Skunk cabbage is a bog plant and not a pond
plant.
That means it doesn't want to be in water, just wet soil.

 

@buddleia64 Humus rich soil means soil with a lot of organic matter in it; so a lot of leaf mould or home made compost.