I find that my java fern (Philippine) gets ravaged by pond snails. Once a leaf is damaged it never recovers. Badly damaged leaves are best cut off. A couple of years ago I cut all the leaves of on a large plant and thought it took a long time it did recover completely. Unfortunately so did the pond snails.
Damaged leaves will throw off new plantlets so there is always that way of reproducing the plant.
The product No Planaria wipes them out if you're thinking of.. But beware if you have shrimps, they say it's shrimp save and indeed the product is.. But the nitrite peak comming after that could kill them if you have a lot of rotting snails or wurms in the substrate.. Fish don't bother, they need some more but still be carefull.
Today i received my Java Philippine.. Must say very lovely Java.. Bright green and i can imagine it being on a snails which list when sliding along the sallad bar.. It has very thin and very soft leaves.. Much thinner and softer than any other java i have which have rather hard leaves compared to this fragile and soft baby..
Here it is next to it's nephew from Taiwan.. Got a load of pond snail in there i'll keep a close eye to it.. Maybe another reason to put a litle harem of dwarfpuffers in this tank.
Than i would name them Persephone, Reiha and Cerberus..