At least 1 cup (at least two ounces) of worms should be added at least 1 week after you have a several inches of kitchen scraps in the "compost tube." Composting worms eat organic substances that are already decomposing (not fresh greens).  A single garden tower can easily support a full pound of red wigglers, but it is not necessary to start out with so many worms! See our resource list for sources of worms. You can even buy them as "vermipods" (worm eggs).  We suggest either a) red wigglers, b) red wigglers and night crawlers, or best yet c) a composting worm mix containing a few popular varieties of aggressive composting worms!