How to Build a Simple DIY hoop-style greenhouse - LivingGreenAndFrugally.com
Melons grow well in containers. Plant one to two plants in a big pot (at least 5 gallons) and let the vines sprawl over the edges, supporting the fruit if necessary. And don't let up on water and fertilizer.
Trellis idea. I like this. Very simple, could be made w/ scrap wood and I like that you can fold it up and put it away to store if need-be.
Alaskan-style coldframe built with pressure-treated 2-by-4s and fiberglass sheeting. Pulley-drawn cords make it easier to open for ventilation.
15 Excellent DIY Backyard Decoration & Outside Redecorating Plans 9 Home Sweet Home Pots
Screens for raised beds to keep out critters in the summer. Drape plastic over in spring and fall to extend growing season.
Vertical Gardening 101
DIY Raised Garden Beds
You can teach your kids about gardening from anywhere with a DIY Raised Garden Bed! Making one can be this easy...