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.