Coco moss, or coconut coir, is a sustainable alternative to peat moss in gardening. Like peat moss, coco moss is a sterile growing medium that helps retain moisture without becoming soggy when used in potting mixes. Coco moss breaks down more slowly than peat, giving it a longer lifespan as a potting medium. Coco moss is usually available in bricks of dehydrated fibers, but may also be sold slightly moistened in bags. Planting in coco moss is not much different than using other soil amendments in your potting mixtures.
Fill a bucket with lukewarm water. Place the coco moss in the bucket and allow it to soak for two hours. The coco moss swells to three times its dried volume once soaked.
Remove the coco moss from the water. Squeeze it in your hands, wringing out the excess moisture.
Mix one part clay soil, or two parts loam or compost, with three parts of the coco moss and one part vermiculite. Break up any chunks of soil or coco moss with your hands while you are mixing so the planting mix has the same texture throughout.
Fill the pots to within 1 to 2 inches of the rim with the coco moss planting mixture. Sprinkle water on the mix until it is evenly moist throughout.
Sow seeds in the potting mix to a depth twice that their diameter. Plant seedlings in the coco moss mix at the same depth they were at in their nursery pots.
Water as needed to keep the mix evenly moist but not soggy. Generally, water when the soil surface begins to feel dry, adding water until the excess just begins to drain from the bottom of the pot.