Short answer. Start small and boring: a tent, one good LED, a fan and carbon filter, 11-19 L (3-5 gal) pots of quality soil or coco, a pH pen and an EC meter. Grow one to four plants of a well-documented feminised line. Write everything down. Most first grows fail from overwatering, too much nutrient and too much fiddling, not from too little gear.
Legal first. Home growing is legal only in some places, with plant limits and rules about visibility and security. Check your local rules and the GenetixBay regional page before buying seed.
What's happening
A plant needs light, water, air at the roots, nutrients and a stable climate. Each has a "good enough" window. A first grow is about staying inside the windows and learning what your plant looks like when it is happy.
Choose your genetics
| Option | Good for | Watch out |
|---|---|---|
| Feminised autoflower | Speed (9-14 weeks), small spaces, no light-schedule change | No time to recover from mistakes; don't top late |
| Feminised photoperiod | Control over size, cloning, learning training | You must flip to 12/12 and keep the dark period dark |
| Regular seed | Breeding later | Half will be males to remove |
Pick a line with a GenetixBay record at L2 or higher and real grow journals. See seed types.
Numbers that matter
| Parameter | Seedling | Veg | Flower | Notes |
|---|---|---|---|---|
| PPFD (µmol/m²/s) | 150-300 | 300-600 | 600-900 (up to ~1,200 with CO₂ and experience) | Yield rose roughly linearly with light up to ~1,800 in one study [1]; beginners should not chase that |
| DLI (mol/m²/day) | 10-20 | 20-40 | 26-40 | DLI = PPFD x hours x 0.0036 |
| Photoperiod | 18/6 | 18/6 | 12/12 (photos); 18/6-20/4 (autos) | Dark must be dark [4] |
| Air temperature | 24-27 °C (75-81 °F) | 22-28 °C (72-82 °F) | 20-26 °C (68-79 °F) | Net photosynthesis peaked ~25-30 °C in [2] |
| RH | 65-75% | 55-70% | 45-55%, 40-50% late | Lower late to reduce bud rot risk |
| VPD (kPa) | 0.4-0.8 | 0.8-1.2 | 1.0-1.5 | Leaf-temperature based |
| pH (soil / coco) | 6.2-6.8 / 5.8-6.2 | same | same | Measure what goes in and what runs off |
| Feed EC (mS/cm, coco) | 0.4-0.8 | 1.0-1.8 | 1.6-2.2 | Organic soil may need water only for weeks [3] |
These are Grower practice ranges anchored to the cited studies; your cultivar may differ.
Pot size is a trade-off. Bigger pots give bigger yields within reason and forgive missed waterings; smaller pots can still produce big plants if you water and feed often (the founder has grown 4 oz+ from a 16 oz cup). For a first grow, 11–19 L (3–5 gal) is the forgiving choice.
Step by step
- Set up and test the room for 48 h before seeds. Log temperature and RH day and night. Fix the climate first.
- Germinate in moist paper towel or directly in a small pot at 22-26 °C (72-79 °F). Plant root-down 0.5-1 cm (¼-½ in) deep.
- Seedling (1-3 weeks). Light gentle, water a small ring around the stem. Do not feed most bagged soils yet.
- Veg. Pot up when roots fill the container. Water when the pot feels light, to 10-20% runoff in coco, less in soil. Begin training (low-stress tying down) on photoperiods.
- Flip (photoperiods only). Change to 12/12 when plants are about half the final height you can fit. Expect them to stretch.
- Flower. Keep the dark period uninterrupted. Lower RH. Check for pests weekly with a loupe.
- Ripening and harvest. Keep feeding at the strength the stage calls for right up to harvest; if you mix single salts, taper only nitrogen over the last few weeks. Don't flush before harvest: it's a Myth that starves the plant while it packs on its final weight, trichomes and resin, so it costs you yield and resin (see the flush debate). Look at trichome heads with a 60x loupe: harvest when most are cloudy and some amber, not by the stigma colour.
- Dry whole branches at ~18-21 °C (64-70 °F) and ~55-62% RH for 7-14 days, until small stems snap. Trim wet before hanging or dry afterwards: it's grower preference. Dry trimming (brushing the sugar leaf off a dry bud) is easier on the hands; wet trimming suits a humid room. See drying.
- Cure in airtight jars, opening briefly daily for the first week, then less often, letting the buds' moisture fall slowly. Judge the bud, not the air: a hygrometer reading only counts once the sealed jar has sat 12–24 h (aim for 55–65 %, aw 0.55–0.65). Skip humidity packs; they're a marketing gimmick.
Common mistakes
- Watering on a schedule instead of by pot weight. Drowned roots look like hunger.
- Feeding full strength from week one.
- Flushing with plain water for the last 1–2 weeks "for taste". It costs yield and resin; taste comes from a healthy plant, slow drying and a proper cure.
- Lights too close, especially strong LEDs: bleached tops, upward-cupped leaves.
- Changing three things at once when something looks wrong. Change one, log it, wait.
- Skipping the journal. A dated, photographed journal is the only way to learn from a grow, and on GenetixBay it is what links your harvest back to the seed pack.
