"Legalization of Marijuana" Cannabis sativa or marijuana has been cultivated for over 5,000 years. The plant spreads like milkweed and will eventually run out any other plants nearby. In the wild, or grown with care marijuana can grow to be 3 - 20 feet high. The plant itself can be used for rope, material, medicine or for smoking. But, whatever way you choose to use this plant, it is illegal. It was made a law in the early 1900’s that it was illegal to smoke, eat, or get high from this plant. The plant’s only legal use was for rope and materials. Even this was controlled by the governmen