According to this website peppermint and spearmint have >3:1 calcium to phosphorus ratio.
Mint tends to go wild here. We planted some in two pots several years ago, and it is now in almost all the pots we possess
We've got two types, one is English mint, which is kind of fuzzy and more aggressive, and I don't know about the other. We planted chocolate mint at one point, but it doesn't smell to chocolaty.
Is there any reason not to try a leaf or two of mint with the turts?
They love cilantro, so I was thinking maybe they like strongly flavoured herbs?
I'm always looking for new and available things to add to the turt's diet
