I have just completed my new enclosure for Elvis, a 15 year-old Desert Tortoise. Grasses, Hibiscus, Geranium, Marigold and Panzies through-out. I would like to add a fruitless dwarf olive shrub/tree because I think it would do well and it's pretty, but cannot find anywhere would this be okay or harmful. There are no fruit to fall, and the leaves will not shed much. I believe I read that olive trees are high in oxalates but I'm not sure how my tortoise would get to it. Anyone have an opinion?