Put some bite in your mulch
To keep hungry insects and slugs away from your cucumbers and other vegetables, mix strips of aluminum foil in with your garden mulch. As a bonus benefit, the foil will reflect light back up onto your plants.
Protect tree trunks
Mice, rabbits, and other animals often feed on the bark of young trees during winter. A cheap and effective deterrent is to wrap the tree trunks with a double layer of heavy-duty aluminum foil in late fall. Be sure to remove the foil in spring.
Create a sun box for plants
A sunny window is a great place for keeping plants that love a lot of light. However, since the light always comes from the same direction, plants tend to bend toward it. To bathe your plants in light from all sides, make a sun box: Remove the top and one side from a cardboard box and line the other three sides and bottom with aluminum foil, shiny side out, taping or gluing it in place. Place plants in the box and set it near a window.
Build a seed incubator
To give plants grown from seeds a healthy head start, line a shoe box with aluminum foil, shiny side up, allowing about two inches of foil to extend out over the sides. Poke several drainage holes in the bottom — penetrating the foil — then fill the box slightly more than halfway with potting soil, and plant the seeds. The foil inside the box will absorb heat to keep the seeds warm as they germinate, while the foil outside the box will reflect light onto the young sprouts. Place the box near a sunny window, keep the soil moist, and watch ‘em grow!
Grow untangled cuttings
Help plant cuttings grow strong and uncluttered by starting them in a container covered with a sheet of aluminum foil. Simply poke a few holes in the foil and insert the cuttings through the holes. There’s even an added bonus: The foil slows water evaporation, so you’ll need to add water less frequently.