are we allowed to take pictures in here? I am a photographer, and my model and I would love to take garden pictures in a location like this. Thanks!

I have clicked pictures of plants once in a while without any problems. I am not sure if they would want you with your tripod and photography gear, but I don't think taking pictures of plants for personal use should be any issue.

I would imagine. I have not tried but I know they have persons who take pics for holidays, etc. But as far as just random persons taking pics, I am not sure.