I have 5 full grown mini orchids that are only 3" high.
They are a lot smaller than the plants that the Aero Garden was designed for.
The semi-hydroponic method does not need a drip system, the reservior is large enough so you only have to fill it about every 2 weeks.
Also the drip system won't work with the semi-hydroponic system, the nutrients have to be flushed out every watering with a large amount of food/water.
Go to:
All about Semi-Hydroponics
It's a great site for S/H