Flowers and leaves are fine in the tortoise garden but like everything else it's best only offered as part of a varied diet, as it is a brassica. May be found growing in the wild.
Please be aware that two or more
goitrogenic plants should not be fed in conjunction with each other, and
the sum total of goitrogenic foods should not exceed the guideline for a
single plant of 'in moderation' (amber-green) or 'sparingly'
(amber-red). This will ensure that goitrogenic consumption stays within