Indoor plants have not been battered around by the elements so the first few weeks outside can really do a number on your ladies if you don't harden off. I usually turn the fans up in my room and make sure my babies are blowing around good, this will toughen up the stems and get them used to a little wind burn, also witholding a little moisture will force the root system to develop a little faster in search of water. However this should not be done on already root bound plants, that wont help your cause any. Two weeks of high speed fan training and you will be amazed at how much thicker and more resilient your stems are. Much better for transporting water and nutes to growing tips, and a much better chance that the plant will be able to support the weight of its own massive resin drenched buds. Hope this helps. Stay Munchie My Friend.