4 or 5 year old growth forest. (clear cut) then replanted. Plant some close to the tree line of old growth. Make sure it is off the beaten path.. and the longer it takes for you to get there usually the better. Plant them on a south facing slope to retain most sunlight. most tree lines around clear cuts have creeks near by as they do not disturb the sensitive growth. I find that when they are close to tree lines helicopters and planes can't get close enough and wont risk it. I live in BC and my spot has been solid for 4 years now.
Don't use google earth. Maps do not get updated enough. Best way is to find some wooded areas that are hardly used. And check it out, be sure not to leave footprints. And when making a spot, make sure you can access it from a couple different ways.. so you do not make a path directly to your garden.
Be gentle on your feet and don't be obvious (leaving garbage around) Pack in what you pack out.. be discreet and you will be fine
Remember loose lips sink ships bro. GL with your garden hope it all works out