Eh?
Not sure I follow what you are asking. You want to keep plants in a tank for a gecko? or just a tank full of plants and nothing else?
If you want something other than the plants living in the enclosure, I would suggest using silk plants. They won't dry up and die under the heat of basking lamps (if the gecko or whatever needs one). Put living plants around the outside of the cage, easier to care for the plants, less chance the plant will get eating by whatever is living in the tank, less chance of bacteria growing in the moist pot the plant is in and much easier to keep the tank clean. Oh and less chance the plant will get uprooted by the lizard or trampled over by the lizard.
To me, unless you plan on building a rather large vivarium ( something that is big enough for you to walk into) with plants and water to maintain a 'living' environment (sprinklers set up to both water and mist the greens for a rainforest like environment etc, enough space to prevent unhealthy buildups of animal wastes etc) there really isn't any benefit to keep plants in a lizard's tank. This is especialy true for small tanks, like 10 or 20 gal tanks. Better to just put plants in pots on the outside of the tank.