just wondering if this stuff could work for outdoor plants? has anyone tried it yet? http://www.extremepumpkinstore.com/ecom-prodshow/c02.html CO2 Fixing Foliar Spray CO2, is a revolutionary calcium carbonate foliar spray proprietarily-derived from a natural occurring compound. C02 utilizes a new form of nanotechnology which processes the compound to such a fine size that it is able to permeate the foliage of plants. Once inside the cell walls, CO2 is released as both calcium and usable carbon dioxide, increasing photosynthesis levels three-fold. Directions of Use Dilute 1 Tablespoon per gallon of water. Spray 1 Gallon of Diluted CO2 per plant, applied foliar to both sides of the leaves, every 1-2 weeks.