Cannabis plants are all not similar, different strains of medical marijuana serve different therapeutic uses. Medical Marijuana Strains are of three types: Indica Strains, Sativa Strains and Hybrid Strains. Cannabis Sativa grows very high and stem like plant. Its leaves are much smaller than the Indica medical marijuana strain. Cannabis Indica has extensive leaves and shorter and bushier than other marijuana strains. Cannabis Hybrids are cross-bred marijuana strain and they are the combined strains of Indica and Sativa.