Keeping weeds out of your outdoor plant box can be a challenge, but with the right strategies, you can maintain a healthy and weed-free garden. Here are some effective methods to prevent weeds from taking over:

1. Use Mulch: Apply a thick layer of organic mulch, such as wood chips or straw, to block sunlight and suppress weed growth. Mulch also helps retain soil moisture.

2. Plant Densely: Fill your plant box with healthy, closely spaced plants to leave little room for weeds to sprout. Ground covers like creeping thyme can also help.

3. Weed Regularly: Pull weeds by hand as soon as they appear to prevent them from spreading. Regular maintenance is key to long-term weed control.

4. Use Landscape Fabric: Lay down a permeable landscape fabric before adding soil to create a barrier against weeds while allowing water and nutrients to pass through.

5. Try Natural Herbicides: Spray a mixture of vinegar, salt, and dish soap on weeds for an organic solution. Avoid spraying near desirable plants.

By combining these methods, you can enjoy a thriving outdoor plant box without the hassle of persistent weeds. Happy gardening!