Artichoke stems are found on the the artichoke which itself is a variety of thistle which is eaten as a food.
So can rabbits eat artichoke stems?
No they can’t unfortunately. They are poisonous to rabbits and will harm them if eaten. They are best avoided as a food for bunnies
This is taken from wikipedia about the toxicity of the stems of an artichoke.
The total antioxidant capacity of artichoke flower heads is one of the highest reported for vegetables. Cynarine is a chemical constituent in Cynara. The majority of the cynarine found in artichoke is located in the pulp of the leaves, though dried leaves and stems of artichoke also contain it. It inhibits taste receptors, making water (and other foods and drinks) seem sweet.