Similar to nursery flats, these rectangular, plastic trays are divided into planting cells — all slanted at a 30-degree angle, with bottom holes that promote drainage and aeration. Each tray comes with a bracket for mounting, though you'll need to add a wood frame to achieve the "wall art" look above. Read more: Vertical Gardening Ideas - How To Make a Vertical Garden - Country Living
DIY for $25! Mark this one down as a summer project!