Miniature Cattails dilema

I don't know what it is but I have never been able to get them to grow
or last.

I have experimented with them planted at various depths from 0" to 2"
or more, in a half barrel and also in a large pot in a natural pond
where everything else flourishes. I have planted them in the pond
without a pot as well, yet they all seem to turn yellow and die or rot
off at the waterline...I have fertilized and not fertilized. What
gives with these miniatures? I also have the same problems with
horsetails......everything else does great.

All my lillys have put up numerous new growth since being shredded by
hail, and my Iris just about grew overnight after being torn up with
hail as well and most all of them (yellow, Louisiana, and Gamecocks)
are all in bloom.......and spreading fast.much to my delight. I have a
row of Canna's which are now about 2 1/2 to 3 feet tall doing fine as
well........

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Put some color in your cheeks...garden naked!