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Measure the grass plug's root ball or eyeball its approximate length. Dip your shovel into the soil and dig a hole that's about the same depth and width as the root ball. Avoid making the hole deeper than the root ball, as too deep can bury your grass plug's top. Sprinkle a grass or starter fertilizer into the hole as recommended by the package instructions, based on the hole's depth. Starter fertilizers help create a hospitable place for grass plugs as they develop root systems in the soil. Buy a starter or grass plug fertilizer from a nearby garden center or plant nursery. Lower your grass plug into the hole and adjust it so the top stays upright. Fill the rest of the hole with soil, covering the entire root ball to prevent it from drying out later on. Avoid covering the grass plug's top with soil, as this can increase the risk of diseases and fungal infections. Once you've planted each grass plug into the soil, use your hose or watering can to water each one. Keep watering the soil until it is damp, but not waterlogged to prevent overwatering the plugs.
Dig a hole about the same size as the grass plug's root ball. Place a fertilizer in the bottom of the hole. Plant your grass plugs in the soil. Water the soil again after planting it.