Grasses - Split and move

in Plants
Happy New Year all. Quick question re ornamental grasses. I have 2 or 3 in the garden that have established over the last 3 or 4 years. I would like to move them but also split one of them to propagate. When is the best time to move them and is ok to split them?
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Never got a stipa or a pennisetum to survive a winter in my last garden so haven't tried them here either.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I had many failures when I tried to divide or move grasses before they were growing well.
I now wait until the new growth is 3-4" then split or move them and no failures so far..
Wisdom is not putting it in a fruit salad.