Seaweed is an excellent natural mulch option for outdoor plant boxes, offering numerous benefits for gardeners seeking sustainable and organic solutions. Rich in essential nutrients like potassium, magnesium, and trace minerals, seaweed helps nourish plants while improving soil structure. Its high moisture retention properties reduce the need for frequent watering, making it ideal for dry climates. Additionally, seaweed mulch decomposes slowly, providing long-term benefits without the risk of compacting soil.

To use seaweed as mulch, rinse it thoroughly to remove excess salt, then spread a 2-3 inch layer around your plants. Avoid piling it directly against stems to prevent rot. Over time, the seaweed breaks down, enriching the soil and promoting healthy plant growth. Unlike synthetic mulches, seaweed is biodegradable, eco-friendly, and free from harmful chemicals.

Gardeners in coastal areas can harvest fresh seaweed, while others may find dried seaweed products at garden centers. Whether fresh or dried, seaweed mulch is a versatile, nutrient-packed choice for outdoor plant boxes, supporting both plant health and environmental sustainability.