Coco mats are made of fibrous coconut coir, which are the fibers between the husk and the fruit of a coconut. Use the mats to line wire baskets, planters and window boxes as they hold the soil in while adding an organic look to your plantings. Coco mats offer another benefit: Flowers planted through small slits in the coco mat add further color and interest to the planters as they create the look of a ball of bright blossoms. Coco mats are available at garden centers and nurseries.
Fill a bucket with warm water. Submerge the mat in the water and leave it to soak for 30 minutes to one hour. Lift the mat out of the water and squeeze out the excess moisture.
Press the mat into the wire planter frame. Mold it to the frame with your hands. The rim of the coco mat should be even or slightly above the rim of the wire planter frame.
Cut one-inch to two-inch planting holes through the coco mat with a utility knife. Space the holes three to four inches apart, depending on the spacing recommended for the flowers you are planting.
Fill the lined planter with soil up to the first level of holes in the mat. If you are planting flowers into the bottom of hanging planter, place one inch of soil in the bottom of the basket.
Remove the flower transplants from their nursery pots. Slip the roots through the holes in the mat until the crown of the plant---where the stems emerge from the root system---is even with the coco mat. Repeat for each flower you are planting on that level.
Fill in around the plant's roots with soil until you get to the next set of holes. Plant the flowers through the holes, then add more soil. Repeat the process until the soil level is within one inch of the rim of the planter.
Plant flowers in the top of the planter, spacing them at the distance recommended for the plant variety. Plant the top flowers so the crown of the plant is even with the soil surface.
Water the planter from the top until the moisture begins to drip through the mat and out the bottom of the planter. This ensures the soil is evenly moist throughout.