Coffee Grounds

You can reuse old coffee grounds to nurture acid-loving plants like blueberries, azaleas, heather, and holly. Sprinkle the grounds around the plants and lightly mix them into the soil. Or, put them straight into your compost pile to add a powerful punch to your percolating “black gold."
Related: 11 Uses for Coffee Grounds
Newspapers

You can shred old newspapers and use them as mulch. Or, better yet, spread them out in layers under other mulching materials, such as wood chips or shredded leaves, to help inhibit weed growth.
Related: 12 "Zero Dollar" Garden Hacks
Youtube via tinsley207
Old Tires

Tire retailers and many municipalities charge a recycling fee to dispose of discarded tires. Save the cash and put your old tires to use by painting them and turning them into planters. Sitting single, stacked, or in an artful configuration, they will make a practical and playful addition to your landscape.
Related: 11 Things Never to Buy Secondhand
Shoeboxes

A late frost in early spring can endanger tender young seedlings. Cover them with old shoeboxes to protect them from harsh winds and cold temperatures during freezing nights.
Related: 14 Totally Free Ways to Start Your Own Garden
Egg Cartons

Cardboard or Styrofoam egg cartons make excellent seed starting containers. Just fill each egg cup with potting mix, then sow your seeds. If you've used a cardboard container, once the plants are big enough to transfer outdoors, you can simply cut the cups apart and embed each one into the dirt. The cardboard will biodegrade and add nutrients to the soil.
Related: 10 Things to Do Now for a Better Garden Next Year
Paint Stirrer Plant Labels

Reuse paint stirrers (ice pop sticks, cardboard, and plastic utensils work too!) to make plant markers for your veggie garden. Label them efficiently with a felt-tip marker, or pretty them up with paint. Either way, you’ll never again have to wonder what you’re watering.
Related: 9 Insanely Easy 1-Hour Backyard Projects
Soda Bottles

Fancy store-bought watering globes help keep your plants hydrated when you’re away. But you can make something just as effective with an old soda or wine bottle. Just poke several small holes in the cap, fill the bottle up with water, and stick it upside down in the ground to hydrate plants right at the roots.
Related: 20 Summer Life Hacks Everyone Needs
Garbage Gardening

The garden gives you a great opportunity to recycle.
Don't Miss!
Whether you're a lawn care novice or a master gardener, everyone can use a little help around the yard. Subscribe to The Dirt newsletter for tips, recommendations, and problem-solving tools that can help you tame your great outdoors.