The definitive list of food that Guinea Pigs can eat

[FabIsGettingThere]

I have a list from the internet but can't always get the stuff in the supermarket and there are so many other fruits and veg I wonder if they can have those instead.

TIA.

Mint & fennel as a treat - just offcuts of fennel, but handfuls of mint which grows in the park near school .

My piggies love banana but it gives them cystitis so they only have tiny bits. Some like pear and some don't, they like raisins but only give them one or two as not sure if they're allowed them. Cucumber, kale, spinach, celery and leaves they all love. Tried them on sprouts but they didn't like them surprisingly!
They have been found munching on my cheese plant when I've not been looking

Mine love dandelions best.

They have carrots, (peelings they like better than chopped). I give them the cucumber peel from the DC's lunch and they love that. They like bagged salad - spinach, watercress and rocket. They love baby sweetcorn as well. They are actually quiet spoilt I think!

They don't like curly kale, brocolli stalks, (unless I shred it), cauliflower leaves, fruit in general.

mine have
carrots
celery
cucumber
tomato (good for vitamin C)
parsley (ditto)
apple sometimes
green cabbage leaves
very occasional lettuce

Pigs I have had in the past also have loved:
banana
grapes
Strawberries (spoilt!)
curly kale
broccoli

A book I have warns against too much spinach because of the oxalate content and risk of kidney stones; and too much lettuce for something else, can't remember exactly what.

They also have dried g'pig food (Gertie Guinea when I was in the UK) and lots of fresh hay.

I have given them fresh mown grass before but it has given them diarrhoea before now so tend not to - they don't know when to stop, that's the problem!

My four love (in addition to hay and grain)

lettuce
babycorn
sugarsnap peas
broccoli stalks but not leaves or flowers
carrots
cucumber
dandelions
handpulled grass (as opposed to mown)

and go into ecstasies over basil (now growing all over the garden for their sake!) Oh and chamomile hay but they only get that if I'm feeling rich!

Have read that acidic foods like apples and tomatoes were a no-no and not to give iceberg lettuce - stick to the greener ones.

apples and tomatoes need to be cut up to avoid the problems associated with the acidity, which are more about mouth damage iirc.