Prepare a garden bed by rototilling, aerating, and working compost into the soil just as you would any garden, but in dimensions to accommodate the wood pallet. Dig a rough outline of approximately half the depth size of the outside frame of the pallet (approximately 4 inches) and place the wood pallet in the area. Plant seeds, seedlings or starter plants in the rows that are created by the openings in the wood pallets.
Label the rows by marking on the pallet with a permanent marker or a wooden handmade stake. Water and care for your wood pallet garden just as you would any other garden — minus much of the weeding — and enjoy a compact, efficient little vegetable patch with much less work.

When it’s time to rotate your garden at the end of the growing season, just lift the pallet from the ground and store away or move to next year’s location.
Melanie is partially right, look on the side if the pallets, there will be a stamp if you see HT its heat treated wood and OK, if you see MB its treated with a pesticide, do not use. If this is something you want to experiment with, they’re the easiest raised garden bed ever  and an eco-friendly, time-saving approach to growing flowers or vegetables at home. When you locate wood pallets, make sure to choose ones that are in good, sturdy condition and have not been treated with pesticides.
The instant rows created by the pallet slats give weeds no place to grow between rows and are the perfect place to write plant names.

Wood pallet garden frames require no assembly, are readily available and are also usually free.

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