Start a fire
Dryer lint is flammable, which is why we’re urged to clean out the trap after each load of laundry. Collect it in a sealed jar to use as tinder the next time you start a fire in your backyard fire pit. For a self-contained fire starter, stuff cardboard toilet paper rolls with lint.
Use as mulch
You can add dryer lint as a mulch around potted plants as long as you’re not using dryer sheets, which may leave an unwanted chemical residue.
When spread out and dampened with water, dryer lint can form a barrier to protect soil from erosion. If you don’t like the look of soggy lint, use the lint as an under-layer and cover with decorative stones.