Use the cannabis plant ability to blend in with other plants to the point that they are unidentifiable by all but the most observant. Choose similar growing neighbors for your marijuana plants like cleome, kenaf, a bunch of nettles or blackberry vines.
Plants started outdoors late in the season never get very big and never attract the least bit of attention when placed next to plants of similar or taller stature. Even tall plants grown among several trees will be almost invisible in their camouflage. Grow in places where people have nothing to search for.
Outdoors the object is to control access to an area, and not to arouse suspicion. Tuck them here and there, never in a recognizable pattern. Space them out, and fit them in to the existing landscape such that they get full sun, but they're hidden or blend in. Fence lines and groups of several together are best. Try to find marijuana seeds strains that seem to match the surrounding plants. Feed nitrogen to your plants if they need to be greener to blend in. Some growers even use plastic red flowers, pinned to a plant, disguising it as a flower bush.
Plant in places away from houses and farms where somebody could see you from distance. Visit the plants at night on full moons, and if you are visible to neighbors, appear to be pruning a tree, mowing the lawn, or doing something in the yard that makes you invisible. Dig a hole and put a potted plant in it. The plant's height will be reduced by at least a foot and it will collect and use more rain water.
Try to grow off your property, on adjacent property, so that if your plot is found, it will not be traceable back to you. If it's not on your property, nobody has witnessed you there, and there is no physical evidence of your presence (footprints, fingerprints, trails, hair, etc.), then it is virtually impossible to prosecute you for it, even if the cops think they know who it belongs to. Let me stress that: farm off your property and leave no physical evidence.