What cannabis hydroponics means
Hydroponics grows plants in water instead of soil. Roots sit in a nutrient solution or in an inert medium such as rockwool, clay pebbles, or coco coir. The grower controls water, oxygen, pH, and mineral salts. Cannabis grows fast in the method because roots take up nutrients on contact.
A single-bucket setup with an air pump starts around $150. A full tent kit with a light and a recirculating reservoir runs $500 to $800. Most cultivars need 8 to 12 weeks of flowering. Add 3 to 5 weeks of vegetative growth. Total time from seed is roughly 11 to 17 weeks.
Pick one system first
- Deep water culture (DWC). Roots hang in one aerated bucket. One plant per bucket. Lowest startup cost. Reservoir temperature is the main risk.
- Drain-to-waste. Each watering flows through the medium and out. Forgiving for new growers. It uses more nutrient solution.
- Ebb and flow. A timer floods a tray, then water drains back to the reservoir. Good for several small plants.
- Drip. A pump pushes solution to each plant through tubing and emitters. Emitters clog.
Numbers that matter
Water temperature: 65°F to 72°F (18°C to 22°C). Warm water holds less oxygen and invites root rot.
pH: 5.5 to 6.5. Cannabis takes up calcium and magnesium best near 5.8 to 6.2. Test daily for the first two weeks.
EC: 0.8 to 1.2 in early growth, 1.4 to 2.0 during heavy flowering. A meter costs about $40.
Light: 18 hours on, 6 off during vegetative growth. Switch to 12 on, 12 off to trigger flowering. Cannabis is a short-day plant.
Reservoir: Change the solution every 7 to 14 days. Top off with plain water between changes.
Common beginner mistakes
- Mixing nutrients at full strength on day one. Start at half dose.
- Leaving an air pump off. Roots suffocate within hours.
- Checking pH once a week. It drifts as plants feed.
- Filling the reservoir to the lid. Roots need an air gap.
- Running a light with no timer. Photoperiod controls flowering.
What shows up at a dispensary
Most US cannabis labels list potency, harvest date, and package weight. State rules do not require the grow method on the label in most cases. A budtender can discuss THC percentage and terpene profile. Staff in licensed shops talk about product, not home cultivation law. Check your state's rules before you buy equipment.