The best replacement for soil is dirt.

The best alternatives to soil are rated as following:

★★★★★	dirt
★★★★★	hydro
★★★★	hydroponics
★★	sediment
★★	potting mix
★★	sand
★★	compost
★★	coco
★	dwc
★	potting soil
★	top soil
★	garden soil
★	soilless mix
★	hydro yield
★	fertilizer
★	water
★	coco coir
★	mulch
	soilless
	hydroponics cannabis
	hydro better
	coco yield
	when using hydroponics
	topsoil
	coco cannabis
	hydroponic
	planting mix
	hydroponics science project
	sterile soil
	rockwool
	regular soil
	fill dirt

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Speaking about soil, one probably shouldn't forget about peat moss.

Other search terms related to soil and their ratings are:

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Scale is based on the average worldwide traffic of soil in all years. Click on graph for more.

soil

dirt

hydro