Don't go all practical Mercedes! That's my advice, for what it's worth. I have a secret garden, too. I have to walk through the outhouse at the end of my kitchen garden to get to it. It can't be seen from my house, and is a magical place where new things spring up by themselves, thanks to the birds and animals that inhabit it. I just go in and tidy it up, knowing that foxes have given birth there, birds have nested in peace, hedgehogs are watching me as I move about, and the tawny owls who sit in one of the trees over this place want to ensure I don't banish the little creatures they feed on. My grandchildren love it - there are stepping stones covered in moss that I put there for each child, a small table and chairs if they want a little picnic, and they can play safely in the belief that they are the only ones who know about it. Plants thrive without my intervention - I just cut back the honeysuckle, do a bit of weeding, prune a few plants and strim a bit of rough grass.