Tie down training is a training technique that involves literally tying the side branches of a cannabis plant down, so they extend horizontally from the plant. Since Cannabis plants are phototropic (they grow towards their light source) the branches that are tied down, and unable do grow upwards, will form new branches that will grow up towards the sun or other light source. This will cause the plant to become ``bushier`` and have more branches, thus, more budding sites, produces more buds.