5. Elegant Crown Molding Window Box
If you want to elevate your home’s exterior to look more upscale, elegant, and architecturally integrated, adding crown molding to your window box is the ultimate design trick. This style mimics the sophisticated trim work found on high-end historic homes, making the planter look like an extension of the window frame itself rather than an afterthought.
Start by building a sturdy, basic box out of medium-density fiberboard (MDF) rated for exterior use, or cellular PVC, which is completely waterproof and will never rot. Wrap the top and bottom edges of the box with decorative crown molding, securing it with exterior-grade finish nails and waterproof wood glue. Fill all nail holes and seams with exterior wood filler, sand smooth, and apply several coats of high-quality exterior semi-gloss paint that matches your window trim. The result is a seamless, built-in look. Plant this elegant box with classic, formal arrangements like white hydrangeas, structured boxwoods, and delicate lobelia.