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Busting Grow Room Odors with Activated Carbon Grow rooms and green houses, particularly at harvest time, may give off all kinds of disagreeable odors. These odors are produced by many vegetables like cabbage etc. at ripening time. Unless removed from the air exhausted from the grow room, the odors can be a nuisance to people in the neighborhood. Plant Propagation in Hydroponics The term propagation refers to starting of plants. There are two methods that are most widely used for plant propagation in hydroponics. These are seed germination and rooting cuttings (cloning). Factoring In pH in Hydroponic Cultivation Plants need to absorb nutrients to support growth whether they are grown using hydroponics techniques or they are grown in soil using conventional cultivation methods. But even with the best nutrients available to them, plants may fail to grow and whither away if a factor known as pH is too high or too low.