this is quoted from the sticky in the food section. you should take a look at the other things listed on the guinea pig shopping list. its very helpful

you could maybe even do a printout. VERY HANDY

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GUINEA PIG SHOPPING LIST:
Recommended :
1 cup of mixed veggies per pig per day. Unlimited hay. Unlimited pellets.
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HIGH Vitamin C foods:
- Guinea pig pellets with stabilized vitamin C - alfalfa based for youngsters, pregnant & nursing sows, slim or sick pigs; timothy based for healthy, grown, chubby pigs (do not substitute rabbit or chinchilla pellets; avoid mixes with nuts, seeds or colored bits)
- Parsley - curly or plain (high in calcium)
- Cilantro / Chinese Parsley / Corriander greens
- Celery leaves
- Collard greens
- Mustard greens / Leaf Mustard
- Water Cress
- Garden Cress
- Swiss Chard, Red Chard
- Beet greens
- Spinach (feed in moderation, linked to formation of kidney & bladder stones)
- Carrot tops / leaves
- Peas in pods, Pea Shoots (not dried)
- Dandelion greens
- Grass - wheat, winter rye (grown in pots from seed)
- Kale - curly or plain
- Broccoli, Broccolini (stems are liked better than flowers)
- Broccoli Rabe / Rabe / Rapini
- Cauliflower / Broccoflower
- Brussels Sprouts
- Cabbage
- Red Cabbage
- Tuscan Cabbage / Cavolo Nero
- Savoy Cabbage
- Kohlrabi leaves
- Bell / Sweet Peppers - red, green, yellow (not hot or chile)
- Tomato (sores around mouth can develop; leaves poisonous; artificially grown can be low in vit C)
- Tamarillo (leaves poisonous)
- Orange (caution - sores around lips can develop)
- Tangerine / Mandarin (caution - sores around lips can develop)
- Grapefruit (caution - sores around lips can develop)
- Lemon, Lime (home-grown best, otherwise feed cautiously)
- Cantaloupe Melon
- Honeydew Melon
- Currants - yellow, red or black (leaves also edible)
- Gooseberries
- Strawberries
- Kiwi Fruit
- Mango
- Guava
- Feijoa / Pineapple Guava
- Papaya / Paw Paw / Tree Melon
- Persimmon - american or oriental
- Rosehip