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Sometimes planters are deeper than our plants really need. Filling them entirely with soil is not only costly, it can lead to over watering simply because the plants will not be able to make use of the deep level moisture. Try using aluminum cans and the plastic pots from the nursery to fill space. It saves money and is a great way to re-purpose and recycle. I do this all the time packing peanuts work also
A mini in-ground root cellar! This can be achieved for 5 dollars or less with a free bucket from the bakery and a cheap straw bale.