Burdock leaf, root safe for rabbits?

We have pet rabbits, and plenty of burdock.
The Internet runs hot and cold on feeding rabbits burdock leaves, but roots are seeming just fine, a special treat even.

These bunnies get jchoke greens, mulberry, grape vine,comfrey, pear tree and lambs quarter, pretty regularly, so they can deal with "wild food".
I'm very careful about tossing them just any old weed- my wife LOVES them deeply.

Does anyone here feed their rabbits burdock?

Yes, leaves and roots (rather, the trimmings and ends of the roots, as we people eat the good parts of the roots).
I find that some rabbits like burdock leaf more than others- my younger (4 month) girls won't touch it unless they're really hungry, while the older rabbit enjoys it.

I'll specify it is not an every day thing-- we eat burdock root every few months, and I pull off leaves as they need to be removed to stop shading my sorrel. But I've never had any problem with it.

(by the way, they LOVE the root trimmings and ends, and imagine they'd be thrilled to eat as many of the roots as I'd give them. It is right up there with banana peels for rabbit favorites.)

The biggest concern with any significant amount of Burdock would be the oxalate content, which can ultimately bond with the calcium that is naturally excreted in the urine to create calcium oxalate urinary calculi. So safe, yes, but in pretty strict moderation.