WINDOW BOXES 29 
will make a good soil for the box. Put a piece of 
broken pottery or flowerpot with the hollow side down 
over each of the holes; then place a layer of half an 
inch of pebbles or crushed stone over the entire bottom 
Fic. 20. An Outdoor Window Box 
of the box. On the drainage layer place an inch of the 
coarse material that would not go through the screen. 
Have enough soil in the box to reach to within half 
an inch of the top after settling. Water thoroughly 
and add more soil if it settles too much. Let it stand 
for two or three days before planting. When the soil 
