I’m not sure I understand what you mean. Hay should be 80% of a bun’s diet all the time anyway.
How much pellets and hay do you currently give?

If you lower pellets, you want to up veggies. If you do no pellets, you want to provide a very good variety of greens and work with your vet on that. But, yes you can lower pellets to any amount as long as they are getting the nutrients from other sources.

Hay is a good source of fiber, but not a great source of other nutrients. Do they JUST get pellets and hay, no vegetables or fruits? If so, I wouldn’t decrease pellets too much.

If you are decreasing or eliminating pellets they will need a good variety of veggies daily, not just more than every now and then. Hay won’t be enough nutrients for them in the long run. If you can’t provide a variety of veggies every day, then I would just suggest sticking with the pellets. Pellets are not bad for them as long as you are giving them timothy based pellets they should be just fine with those and hay. Based on how old they are, you can decrease them to about 1/4 cup though. That should be plenty for a smaller adult bunny. My bun is 3 lbs, gets 1/4-1/8 cup of pellets, and two to three varieties of veggies every day.

My bunnies currently do not get pellets, but they get veggies every day (approximately 1 cup each) and then a small amount of oats (a Tablespoon or so depending on bunny size), some willow leaves or sticks, and then a few rose leaves or rose petals (from my own plants so I know they don’t have any pesticides on them). The rescue I work with does feed pellets, I don’t use them myself because two of my bunnies had some stasis issues and seemed to do better without the pellets.

These are outdoor rabbits in a cold garage. I wouldn’t forego all pellets. They need the calories, though I don’t know how much. But it’s my understanding that outdoor rabbits need different diets that indoor BECAUSE of their need to sustain themselves in the cold. Don’t do it if there’s not medical need. Keep the pellets in their diets

My boy has always had pellets AND veggies given to him daily to supplement his hay. I found it surprising that pellets seem to be expensive and your looking to cut costs by introducing a veggie diet? I buy the Oxbow brand pellets and even though I have been led to believe they are a bit more expensive than other brands – but I find it’s Henry’s veggie bill that costs me the most. I too give him between 1 & 2 cups a day and that costs me way more than his pellets. Maybe our fruit and veggie prices are more expensive here? But yer, I did raise my eyebrows when you indicated a veggie diet is cheaper than pellets. There you go.
I reckon your suggestion to cut down on the pellets (and not cut them out completely) and introduce ‘more’ veg is a great way to go, especially if it saves you a few dollars. Sounds like a good plan MK. Cheers.

Edit/ADD – Henry is an indoor bunny and has 1/4 cup of pellets and almost 2 cups of veggies daily along with hay available and topped up 24/7. Maybe this could be a good guideline?

Maybe fewer pellets in the summer when free food abounds outside?? Although now I’m hearing about worming rabbits and it’s thrown me into a bit of a tailspin. My dad never allowed me to buy pellets in the summer when I was growing up, so I have learned to love collecting what nature provides (but that worm thing!!)
Anyway, farmer’s markets are a great source in the summer
And please know that I wasn’t criticizing you having outdoor rabbits. Anyone regularly on this forum must love rabbits and obviously cares enough to do it right!! I don’t worry about yours…as long as they can still get some pellets Ha ha But then mine probably eat too many cuz I worry they’ll be hungry. Yeah, since switching to better pellets, I’m in sticker shock at the prices of those, too. But if you increase the fresh food, as AndHenry said, that cost is insane, too. I can’t believe how much I spend on the four of mine. Have a hoppy day!!