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I cycled mine with plants in. They suffered through the first part of my cycle -- the part where I wait for my nitrite spike -- but went crazy during the nitrate wait. If I had to do it all over again, I'd wait until I had my nitrite spike, before adding them.
Either way, they were fine.
*Edit: Just be sure and sanitize them before adding them! I didn't, because I had read that the rockwool they come in is a good seeding agent for a cycling tank, and wound up with all sorts of nasty things in my tank, including nematodes, water fleas, hydra, pond snails, and damselfly nymphs.