Yes they can get a bit wiffy on a warm day with no breeze. The last few years I've had no probs with mould as the weather has been really good. Only once have I lost about 50% of my crop to mould and that was a skunk from bomb seeds. This year I'm going to do about 4 auto's and 4 photo's but I usually end up with more as I like to play with them. Do cuttings and get different size plants, why not, it's all free.