Whiteflies can be a persistent nuisance for outdoor plant boxes, damaging leaves and spreading diseases. Fortunately, you can create an effective deterrent system using simple, natural methods. Here’s how:

1. Use Reflective Mulch: Cover the soil around your plants with reflective mulch, such as aluminum foil or silver plastic. The light reflection confuses whiteflies, deterring them from landing.

2. Plant Companion Herbs: Grow basil, marigold, or mint near your plant boxes. These herbs naturally repel whiteflies with their strong scents.

3. DIY Sticky Traps: Hang yellow sticky traps near your plants. Whiteflies are attracted to the color yellow and will get stuck on the adhesive surface.

4. Neem Oil Spray: Mix neem oil with water and a few drops of dish soap. Spray this solution on your plants weekly to disrupt whitefly feeding and reproduction.

5. Introduce Beneficial Insects: Release ladybugs or lacewings into your garden. These predators feed on whiteflies and help control their population.

By combining these methods, you can create a robust whitefly deterrent system for your outdoor plant boxes, ensuring healthier, pest-free plants. Regular monitoring and maintenance will keep your garden thriving.