Thank you!!I actually think that’s bristly ox-tongue, one of the many chicories (dandelions and all lettuces are chicories). It’s a safe plant. Prickly lettuce in Southern California generally looks like this after they are a few weeks old:
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If it grow into something that looks more like the picture above, it may help to know that opinions on prickly lettuce vary. The Tortoise Table is quite conservative; some owners take it with a grain of salt. If you look at what they say about prickly lettuce, the chemicals that may be a problem aren’t present when the plant is young. I feed my Russian wild lettuce in the spring. When they get to a certain age/time of year, she won’t eat them any more. Is it because they‘ve gotten to the point where the chemicals might be a problem? Or like many other plants, does it get bitter as it grows older? I don’t know but she stops eating it.
Only you know what’s right for your tortoise, no reason to feed anything you’re not comfortable with, especially if you are a new owner.