Megazorb is fab stuff
I believe that curcubits aren't poisonous but I have yet to meet a domestic bun that enjoyed them. I would compost them personally
Brambles, roses, sunflowers, peas (not sweet peas) maize plants (not the cobs) hogweed, cow parsley, sorrel, clover, dandelions, chickweed, vetches, herb robert, plantains, dried nettles, mallow (and hollyhocks), hazel, willow, apple prunings, pear prunings, any herbs, grasses, wild geraniums (ie cranesbill, NOT pelargoniums), raspberry canes, currant prunings, strawberry leaves, pansies, watercress, sowthistles, nipplewort, willowherb, field maple, comfrey, jack-by-the-hedge, cleavers, coltsfoot.....
Probably easier to post what you have and I'll say yes or no
Personally I don't feed much in the way of brassicas as they upset Bod's tum and It is easier to feed all the same rather than mix up bowls that can be given to the wrong bunsters!
I feed mine fresh forage all year round, plus supplement with a little bit of pellets. Ad lib good have is THE most important part of any rabbits diet. Ideally they need to eat at the very least a pile of hay the same size as themselves every day.
My 8 (now 7) get through just under a bale a week ontop of their forage
Now for the important bit...
If they are not used to fresh foods, you need to be careful to start very slowly with just a small leaf or 2 the size of say a hazel leaf. Build up gradually and either up the amount OR add in a new type but not both at once
I would say after a month or so you can get to ad lib. The bigger the variety the better and the less likely they are to eat a sprig of something toxic if you have accidentally picked something not safe.
They are seasonal eaters given the chance, for example mine only really like blackthorn now until the leaves drop. After that untill this time next year they aren't that fussed with it.
turns out that the medicinal properties in the plant are only in big enough quantities to be affective at this time of year! Blackthorn is IMO one of the most important things we can use to heal a rabbit with any gut issues and I have brought many around from a bout of stasis with it. But it is only effective from when the sloes have that bloom on them till the leaves drop (don't feed the sloes, just the twigs or leaves
).
I find it so valuable that I pick lots now and dry it for the rest of the year
Sorry for the ramble, but I do like to chat about our bunsters