It is definitely fine to feed non-organic veggies! I think the nutritional benefits of feeding a variety of greens outweighs any minimal benefit from organic veg. For me this falls in the “do what you can but don’t stress too much category”. In the summer when I have my garden growing and I can go to the farmers market, the buns get lots of organic stuff. When the pickings are slim in the winter, they get conventional. They don’t really seem to mind either way and I haven’t noticed any changes in their health.
Fun tip, you can easily grow your own spring mix on a windowsill using the container you buy spring mix in. You just poke some drain holes in the container, add an inch or two of potting soil, and sprinkle lettuce mix seeds on top. Place in a sunny spot and in a few weeks you will have spring mix that you can cut and it will grow back. It would be hard to grow enough to feed multiple buns this way, but it is fun to do!
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.