Best is a relative term and that goes for "best" flowers. Nearly all flowers will grow in window boxes but some varieties are better suited than others. Generally flowers that do well in containers don't need to be dead headed to keep blooming, have a moderate growth habit and roots that don't need more than 12 inches or so of soil.
Shade
The location of the window box is one of the most important factors in how well the flowers bloom. Most flowers need at least six to eight hours of sun per day to bloom. However, there are a number of flowers that thrive in the shade. Begonias are fleshy leaved plants that have small flowers. The leaves can be bronze, pure green, or dark green. The flowers come in pink, white and purple. Tuberous begonias have flowers the size of golf balls and arrow shaped dark green leaves. Both do well in shade. Other flowers for shaded window boxes include monkshood, dwarf columbine, lily of the valley, impatiens, violets and pansies.
Sun
Window boxes that receive sun all day long need to be watered as much as once a day during the warm summer months. Lantana is drought tolerant and loves the sun. Zinnias do well with lots of sun and will pop right back if they wilt. Salvia is another good choice.
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