Live plants help raise humidity. Theres these caddies designed to stick on the corner of a bath tub. they are semi circle and have 4 suction cups on them. I plan on taking some ground cover plants, little vinny things and plant them in the caddy and stick it at the top corner of the cage.

It sounds interesting but you may find tha the snake decides to use them as a perch and the weight of the snake may be too much for the suction cups to hold.
And the plants are going to get treated pretty roughly.

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Merlin,
What's Life Without A Little Magic!