In a double boiler, melt the chocolate bars. Take 3 quarts of the strawberries and dip individual strawberries half-way into the chocolate and set on waxed paper to dry in the refrigerator.
To assemble trees: Starting at the bottom, toothpick 1 plain strawberry (stem side in) into styrofoam, then toothpick a chocolate strawberry (stem side in) into Styrofoam. Alternate plain and chocolate moving around the tree until it is covered with strawberries. Top the tree with 1 strawberry facing up vertically.