I'm not worried about DD (3 nearly 4) as she's very sensible but DS is into everything. We were out there today and I just hung around near the house to see what DS would get up to if I left him to it and he was just wandering about and seemed fine.
But we have some gravel at the side of the house which he loves throwing and putting into the watering can etc but every now and then he finds an interesting piece which he puts in his mouth and I feel I just can't risk leaving him alone out there, there are also prickly shrubs etc.
I can see out from the kitchen window but not to the side where the gravel is and sometimes we have foxes at the bottom of the garden. (we have a very very long garden).
I think I've answered my own question, I probably shouldn't leave them alone out there, will probably be able to do that next year?
Yours views much appreciated.