Start with vitamin C, then rotate around it
Guinea pigs cannot synthesise vitamin C, so the rotation is not just about variety for interest — one element is nutritionally non-negotiable. Give a vitamin C-rich vegetable daily. Bell pepper is the workhorse choice because guinea pigs usually accept it and it can be fed every day; rotate the colour if you like, noting the sweeter ripe colours are best treated as the day's richer item. Other vitamin C contributors can rotate in, but pepper is the dependable anchor that keeps the week simple.
Around that anchor, aim for roughly a cup of mixed fresh vegetables per adult pig per day, split across one or two servings, alongside unlimited grass hay, a measured pellet portion, and water. Adjust the total to your pigs' condition and your vet's guidance rather than treating the cup as a rigid law.
A workable seven-day pattern
Build the week as three slots per day: pepper anchor, leafy green, and a rotating extra. Leafy greens can cycle through romaine or other lettuces, coriander, parsley in modest amounts, spring greens, and small portions of higher-calcium greens such as kale only occasionally rather than daily, so one mineral-heavy green does not dominate the week. Extras rotate widely: cucumber, courgette, green beans, celery cut small, fennel, a broccoli floret, a cherry tomato, or fresh herbs like dill and mint.
A sample rhythm: pepper with romaine and cucumber one day; pepper with coriander and courgette the next; pepper with spring greens and a broccoli floret after that. By the time carrot or a blueberry appears, treat it as the week's dessert — a small piece, not a serving — because sugar adds up quickly for an animal prone to weight gain.
Introducing new vegetables without upsetting stomachs
Change one thing at a time. Offer a thumbnail-sized piece of the new vegetable, wait a full day, and check droppings and appetite before it joins the rotation properly. Soft droppings after a new food usually mean the portion was too much too soon or the item is too watery or rich for that pig; withdraw it, return to hay and familiar foods, and try a smaller amount later. Two pigs in one cage can react differently, so watch individuals, not just the shared bowl.
Wash vegetables, serve them at room temperature rather than fridge-cold for sensitive stomachs, and remove uneaten fresh food after a few hours so it does not wilt into the bedding and get eaten stale.
Balancing calcium and avoiding common traps
Owners often worry about bladder sludge and stones in guinea pigs, and diet is part of that picture. You do not need to ban calcium-containing greens — guinea pigs need calcium — but avoid building every day around the richest ones. If parsley, kale, or spinach appears, let the next days lean on lower-calcium lettuces, pepper, and cucumber. Variety across the week is itself the balancing mechanism.
Avoid iceberg lettuce as a staple because it offers mostly water and little nutrition, keep fruit rare, and never let vegetables displace hay: a pig filling up on salad and skipping hay is wearing its teeth and gut down less than it should. Hay stays available at all times, in racks and piles, not as a garnish.
Writing the rotation where everyone can see it
Stick the finished week on the cage or fridge as a simple grid: day, pepper colour, green, extra. Cross off servings as they happen, note any soft droppings beside the item that preceded them, and after two or three weeks you will have learned your own pigs' tolerances well enough to rotate with confidence rather than copying a generic chart.
A written plan matters most in a household where a partner, child, or sitter also feeds, and KinsLe Care Teams lets you assign each day's vegetable serving as a duty and mark it completed with a timestamp, so the pigs never get a second helping by mistake.