Can Russian tortoises eat burdock?
That's what i found too.I did check the tortoise tableand it says burdock needs to be studied more and has some diuretic properties but nothing else.
From "eattheinvaders.org":
Curly dock is good forage for humans, though such is not the case for livestock. Many is he in farm country who has spent days clearing pastures of the stuff, for, as USU Extension explains, the leaves of curly dock “are poisonous to cattle and sheep; the “seeds and vegetation of curly dock are toxic to poultry and can cause dermatitis and gastric problems in cattle;” and curly dock is “an alternate host to many crop diseases.” It is also indicted for toxicity to horses.