The easiest and most effective method gardeners use to eliminate odors is using a negative ion generator. These units are sometimes called ion fountains or air ionizers. Negative ion generators charge air molecules with extra electrons, giving them a negative charge. When negatively charged air ions comes in contact with a positively charged dust particle, the air molecule gives up its electron. The positively charged particle is neutralized and no longer floats since it is not as influenced by electrical charges. The particle drops from the air (precipitates) and falls onto the wall or floor. It no longer creates an odor out of your marijuana seeds that now are plants.