Here's a novel idea....if you have a good spot for them outdoors why not just leave them there to grow rather than shlep them in and out each day? You'll probably end up with a happier plant in the long run.I put them outdoors every day and try to give a minimum of 8h of sunlight
Wow! I don't think I've heard of that with purps (S. psittacina - sure). This is true with all different varieties of purps or just the northern variety?I have NEVER had a S. purpurea flower..in 16 years of growing them! no idea why..