They can in fact survive a light freeze. (Ours do. In fact, we leave them
out all winter...tho the pond does not ice over.) They will sit still til
things begin to warm up seriously. I would wait until near the last frost
to put them out.

We strip the dead leaves off the plants at the start of the year.

Good luck.

Jim
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"REBEL JOE" wrote in message
...
I want to get a good start on my pond this summer. Can anyone tell me at
what temp. it has to be to put in water hyacinth. they worked real well
last summer when i built my pond at keeping the water clear,so I want to
put them in as soon as I can I'm in zone 5. Also I have some frogs when
can I do my spring cleannng so I don't wake them up to soon. thanks


http://community.webtv.net/rebeljoe/POND