Soil: forgiving, slow, low maintenance
Soil is a living medium that buffers mistakes. If you forget to water for a day, soil holds on. If you over-feed slightly, the soil microbes can stabilize pH and lock out excess nutrients before the plant cooks. Veteran growers often go back to soil after years of hydro for exactly this reason.
Tradeoffs: soil grows slowly. A soil cycle from seed to harvest is typically 14 to 18 weeks. Yields per plant tend to be lower than coco or hydro. The medium is heavy, takes up volume, and is annoying to dispose of in an apartment.
Best for: first-timers, organic growers, growers without much daily time. Pair with a quality pre-mixed soil like FoxFarm Ocean Forest, Roots Organics, or Pro-Mix HP.
Coco coir: the modern compromise
Coco is shredded coconut husk. It looks like soil but it is hydroponic in behavior: an inert medium with no nutrients of its own. You feed coco like hydro (every watering carries diluted nutrient solution), but you hand-water it like soil. Plants grow faster than in soil because oxygen reaches roots more easily.
Tradeoffs: you must feed correctly from day one. Coco does not buffer mistakes. pH out of range for two days will burn or starve your plant. Coco also locks calcium and magnesium aggressively, so you need a Cal-Mag supplement from the start (most coco growers add 5 ml per gallon as a default).
Best for: second-grow growers who want faster cycles, growers in apartments where weight matters, and anyone who wants better yields without going full hydro. Mix coco with 20 to 30% perlite for aeration.
Hydroponics: fastest growth, highest risk
True hydro means roots in water with dissolved nutrients, no medium. DWC (deep water culture, bubbler buckets), recirculating drip systems, ebb and flow, NFT, aeroponics. Plants grow 30 to 40% faster than soil. Yields can double. Cycles complete in 9 to 12 weeks from seed.
Tradeoffs: a pH or nutrient strength mistake kills a hydro plant in hours, not days. Power outages are catastrophic because the air pump stops oxygenating the roots. Root rot from oxygen-starved water (Pythium) is a constant worry, requiring beneficial bacteria additives or hydrogen peroxide on a schedule.
Best for: experienced growers who want maximum speed and yield, and who can check on the system daily.
What most growers actually do
Most home growers start in soil, move to coco after one or two cycles, and stay in coco for years. Hydro is more common in commercial settings than in home grows because the maintenance overhead is real. "Living soil" (no-till super-soil cycles) has a strong organic following but takes longer to set up and is not the cheapest entry point.