Can't help with cat tails. Our only experiment was a complete failure. Ick. Haven't tried again since, mostly because of laziness.
Dandelions need to be young. The younger the better. Boiling twice is a partial solution to the bitterness of older plants, but young succulent leaves are the only ones we found palatable.
One thing has stopped us from making wine and eating them. I am very hard pressed to find any good infestations of dandelions that have not be sprayed with something at some time.
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