A cannabis grow kit is a bundle of the gear needed to take a plant from seed to harvest: a light, an enclosure, a pot and medium, nutrients, and often seeds. If you are shopping a CBD store, the kit you want is a hemp grow kit, meaning cultivars bred for CBD and low THC rather than for psychoactive flower. That one distinction drives the legal side and the results.
What usually comes in the box
Kits run from a $40 seed-and-starter-cube bundle to a $500 tent setup. The fuller ones I have seen include:
- Seeds or a rooted clone
- Grow tent or another light-proof enclosure
- LED fixture, often 100 to 200 watts for a 2x2 or 3x3 footprint
- Fabric pot, coco coir or soil mix, and a drip tray
- Two-part nutrient bottles plus a pH pen or test drops
- Timer, small circulation fan, sometimes a carbon filter
- A week-by-week feed chart
What is missing is the part people forget: a thermometer and hygrometer. Bud rot and mold wreck more first harvests than any nutrient mistake.
Hemp versus high-THC cannabis
Legally, hemp is Cannabis sativa with no more than 0.3% delta-9 THC on a dry weight basis, the line Congress drew in the 2018 Farm Bill. Anything above that is marijuana under federal law, even when the plants look identical. Seeds sold as CBD hemp should carry a cultivar name and a stated THC range. Ask for both. If a seller cannot name the cultivar or describe the expected cannabinoid profile, walk away.
Federal hemp status does not make home growing legal everywhere. Some states license commercial hemp growers only, some cap plant counts, and a few still treat any cannabis plant at home as illegal. Check your state agriculture department's hemp program before you spend money.
What it costs
Realistic numbers: $150 to $400 for a complete indoor kit sized for two to four plants, or $50 to $120 if you assemble your own from a light, a fabric pot, and bagged medium. CBD seeds run about $5 to $15 each, and feminized or autoflowering lines cost more. Running one 150-watt LED on an 18/6 schedule adds roughly $5 to $10 a month in most U.S. markets.
Getting to harvest
- Pick indoor or outdoor. Indoors you control light, humidity, and smell. Outdoors is cheaper, but your climate and the season decide everything.
- Germinate in a damp paper towel or peat cube, then move the sprout into its final pot. Hemp seedlings transplant poorly when handled rough.
- Run 18 hours of light for vegetative growth. Photoperiod cultivars need 12 hours of uninterrupted darkness to flower. Autoflowering types flip on their own after a few weeks.
- Feed light at first, near a quarter of the label strength, and raise it as the plant responds.
- Hold humidity near 60% in veg and closer to 45% in late flower.
- Harvest when trichomes turn cloudy, then dry slowly at about 60°F and 60% humidity for 7 to 10 days before curing in jars.
Where kits go wrong
Three failures cover most first grows. Weak light: a 45-watt blurple bulb grows a stem, not flower. Overfeeding: more nutrients is not more cannabinoids, it is burnt tips and nutrient lockout. Rushing the dry: a fast dry leaves a hay smell and burns off the terpenes you grew the plant for.
One more note for CBD buyers. Homegrown flower is untested. If you want to know the actual CBD and THC content of what you grew, or of anything you buy, look for a batch-specific certificate of analysis from an ISO 17025 lab. That is the same standard I use when I check CBD products.