Seed-Starting Materials

Seasoned Gardener : Episode SGN-410 -- More Projects »
Late winter is the time to start seeds for spring planting. You can start seeds anywhere as long as there's adequate space, light, heat and moisture.

A seed tray rack optimizes space by offering several shelves upon which to start seeds. You can assemble your own or buy a kit at a local garden center. Select a rack that is sturdy yet lightweight enough to move; some have casters that make the rack more portable. Choose a rack with adjustable shelves that are sized to hold standard-size seed trays. Be sure there's adequate lighting. Some kits include adjustable lighting fixtures.

Once you've found a suitable rack or place to start seeds, choose containers that will work best for your situation. There are many types of containers that you can use--from store-bought to recycled. Any container that is at least two inches deep and has drainage holes will work:

  • A plastic flat, or seed tray, is commonly used with a cell pack. Cell packs come in a variety of sizes and nest into the drip tray. These seed tray kits usually come with a plastic cover that holds in moisture.
  • Peat pots are made from sphagnum peat moss. They are biodegradable and can be planted right in the ground when the plant is ready for the garden.
  • Peat pellets expand when soaked in water. You can plant the seeds right into the top of the pellet.
  • Milk jug bottoms work well when drainage holes are punched into the bottom.
  • Plastic water bottles can be cut in half with drainage holes cut in the bottom. The top can then be placed on top to create a humidity dome for the plant.
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    Cell pack
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    Peat pots
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    Water bottle
    You can also make your own growing medium. Peat moss is commonly used because it is lightweight, holds moisture and adds organic matter to the mix. Perlite and vermiculite increase drainage and improve aeration. Thoroughly combine these elements before using.
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    Combine three parts peat moss, one part perlite and one part vermiculite to make a lightweight growing medium for starting seeds.
    If you are reusing a container, be sure to clean it thoroughly and let it dry completely before starting seeds in it.

    Garden soil is not a good medium for planting seeds--it's too heavy and may carry disease organisms. You want a lightweight soil that allows the plant's roots to spread out. You can buy a premixed commercial soil from a nursery or garden center. Just be sure to read the labels on all potting mixtures for safe handling instructions.

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