Hi and welcome to the forum
Yes, this is the correct place and don't worry about posting plant images, as we like a challenge
No 1 Yes, this is a rose. Bunnies can indeed eat all parts of the rose, so petals, leaves and stems (including thorns). However, you say that this 'falls' into your garden? If the rose bush is not managed by you, you need to ensure that it hasn't been treated with any chemicals eg pesticide.
No 2 This is Field Bindweed and unfortunately is the Bindweed where the advice is not to feed in large amounts or small amounts over long periods. I do not feed this at all.
No 3 Yes, this is Herb Robert and can be fed to bunnies. You'll get to know the distinctive smell of this.
No 4 I'm not sure what this is. I may come back at a later stage on this one.
No 5 Looks the same species as No 2 to me?
No 6 This is a Potentilla, so a Cinquefoil or Tormentil. I suspect it is non-toxic, but I've never fed it and I've not seen it recommended for bunnies.
The general advice for feeding any new food to a bunny is to give a small amount of just one species. That way you can monitor for any changes to digestion/poo.
I would recommend Foraging for Rabbits, if you want to do your own identification. It's available here
https://shop.rabbitwelfare.co.uk/product/foraging-for-rabbits-2nd-edition-by-twigs-way/
An alternative place on the forum to post about foraging wild plants for bunnies is here
I got obsessed with foraging for the buns late autumn last year after coming on RU and really felt like id missed out on spring and summer. from the first time i gave the buns freshly picked wild food and seen how they love it i was hooked. For me even though i now have 8 buns and foraging does...
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