I'm not sure I would put an entire plant in the cage, the plant itself may be safe but the commercial soil is probably NOT safe. It's suggested that when you buy a plant to use the flowers for gliders to not feed them the flowers for at least 6 months for the chemicals in the soil ( I think, I read that somewhere recently)
If you are just trying to add enrichment to their cage you can use sugar cane and cork wood rounds for them to climb on and play in, they are both glider safe with no soil to worry about
Many folks also make "mock trees" for their gliders to play on out of fleece and mesh and such....
Sometimes the conflicting info isn't really conflicting, but rather only a part of the plant is safe, like the flower, and the stalk/leaves/roots are NOT safe On the same plant. So some people deem the whole thing unsafe when specific parts are just fine. You do need to research to see what parts are safe though.
This is the site I mostly use for edible and safe plants and trees.
http://www.glidernursery.com/glider-garden.html