I've never tried keeping T. ordinoides so am not up on their requirements.

Eastern and checkered garters are subspecies of T. sirtalis. I've kept the local red sided garters, another subspecies of T. sirtalis. All three probably have similar requirements. And I've kept the local T. radix. They have the same requirements as the red sided garters. Its just that the red sided are more likely to be found in woods and brushy areas, while the radix prefer more grassy prairie areas.

T. radix love worms and tadpoles. Any doubt I had about the worms was ended when I caught a radix, and she barfed a stomachfull of worms down my leg.

Good luck.