Should be fine. The strawberry fields at camp seem to take a little more care but that's also a large outdoor field.

[ Or turn them into plants... again in Nico's case. That's something he'd like to avoid. So long as he doesn't get too upset, he won't kill them with his aura like he has other plants. ]

I'm sure someone around here knows how to take care of flowers. If we ask over the computers, we might learn more.