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To make starter flats, take large (quart to gallon size) soft plastic pots and cut off the bottom 2-3 inches (the hard plastic ones tend to splinter). If you want to divide the flat in sections, cut the remainder of the pot in strips and fit them into the flat. The uncut top of the pot is great to put around small seedlings in the ground or to make a spot in the ground where you are starting seeds.
Another use for these pots (large soft plastic) is to cut them in half from top through the bottom and up the opposite side. Now cut each half in half. You will have four pieces with a V shaped piece sticking out at bottom at a right angle. Take a bunch of these, dig a trench around your flower beds, set the cut pots in, V side flat, bury the points and part way up the sides.--You have easy to make, cheap and sturdy edging.