One kind of air plant is a flower called an orchid. There are thousands of different kinds of orchids in the rainforest. Some air plants store water in pools in and around their roots. These pools can become homes for frogs and salamanders. Frogs usually need to lay their eggs in ponds, but some rainforest tree frogs lay their eggs in the pools in air plants. That way, the frogs never have to go down to the ground.Some plants are made for medicine for humans.