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Cardboard egg cartons make great biodegradable seeding trays to plant your starter seeds before springtime arrives.
First, cut off the lid-portion of the carton and fill the little cups of the egg-holding section with potting soil. Then, plant your flower or vegetable seeds according to the instructions on the seed packages. Most seeds have different depth and spacial planting directions.
You can place these egg cartons indoors, on your window sills, before it gets warm enough to plant outside. Water according to the instructions and watch them sprout. When springtime comes, you can plant the whole egg carton with the sprouts into the soil as the carton is biodegradable. An additional benefit is that there will be even spacing between your plants when they grow!