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Step-by-step beginner guides: your first grow, week by week, with checklists.
Autoflower first grow, week by week
A feminised autoflower runs about 9–14 weeks from seed to harvest on a fixed countdown from germination, so plant it straight into its final 11–19 L (3–5 gal) pot on day 1, never transplant, run 18/6 to 20/4 (24/0 also works) for the whole grow, and train with low-stress bending, not topping. Any setback costs time the plant can't get back.
Choosing your setup: tent, space and budget tiers
Choose the space first, then size everything to it. A 60 x 60 cm (2 x 2 ft) tent suits one or two plants and a 100–200 W LED; 80 x 80 to 90 x 90 cm (about 3 x 3 ft) suits two or three plants and 200–320 W; 120 x 120 cm (4 x 4 ft) suits two to four plants and 400–650 W. Size the exhaust fan to change the tent's air about once a minute, plus 25–50 % for the carbon filter and ducting.
Climate basics: temperature, RH and a VPD cheat sheet
Run a grow room at about 24–27 °C (75–81 °F) and 65–75 % RH for seedlings, 22–28 °C (72–82 °F) and 55–70 % in veg, 20–26 °C (68–79 °F) and 45–55 % in flower, and 40–50 % RH in late flower, with nights 3–6 °C cooler. Those pairs land on a leaf VPD of roughly 0.4–0.8, 0.8–1.2 and 1.0–1.5 kPa. Use the cheat-sheet table below: read your air temperature and RH, find the leaf VPD, and adjust RH first.
Coco first grow, week by week
Coco is hydroponics that looks like soil: use buffered coco mixed about 70:30 with perlite, feed a complete mineral nutrient at every watering from day one at pH 5.8–6.2, and water to 10–20 % runoff before the pot dries out. Feed EC climbs from about 0.6–0.8 mS/cm for seedlings to 1.2–1.8 in veg and 1.6–2.2 in flower, fed right to harvest. Never let coco dry out completely.
Curing step by step: a slow moisture decline, no humidity packs
Curing is a slow, steady decline in the bud's moisture, not a constant hold. Jar dried buds ¾ full at about aw 0.62–0.65, keep them dark at 15–21 °C (60–70 °F), burp daily for the first week, then every few days, then weekly, and let them settle towards aw 0.55–0.58 over 2–8 weeks. Judge the bud by an equilibrated jar reading, not the room. Skip humidity packs; if a jar is too dry, add a fresh bud.
Drying step by step: the bud's water activity, and dry trim vs wet trim
Dry slowly, in the dark, at 15–21 °C (60–70 °F) and 55–62 % RH with gentle air that moves around the buds but never blows on them, for 7–14 days. The bud is done when small stems snap and its water activity is about 0.60–0.65, ready for jars. Wet trim or dry trim is grower preference. A fast, warm dry gives a hay smell that never cures out.
DWC first grow, week by week
In DWC the roots hang in an aerated nutrient solution, so two things decide success: dissolved oxygen above about 6 mg/L (air running 24/7) and solution at 18–22 °C (64–72 °F). Run pH 5.6–6.0 with drift inside 5.5–6.2 allowed, EC from about 0.6–0.8 mS/cm for seedlings to 1.0–1.6 in veg and 1.4–2.0 in flower, top off as plants drink and change the solution every 7–14 days. A beneficial-microbe reservoir is the house preference; a sterile one is valid only if you commit to it.
Electrical and water safety for home grows
Run every grow device from an RCD/GFCI-protected outlet (30 mA or less), add up the watts and keep continuous load under 80 % of the circuit rating (about 1,440 W on a 15 A, 120 V circuit; about 2,900 W on a 16 A, 230 V circuit), give every cable a drip loop, keep plugs above the highest water level, never daisy-chain power strips, and fit a working smoke alarm near the grow. Wear gloves and eye protection when handling pH acids and concentrates.
Feeding basics: EC, the nitrogen taper, and why you don't flush
Feed by EC, not by the label: start at a quarter to half the label rate, about EC 0.4–0.8 mS/cm for seedlings, 1.0–1.8 in veg and 1.6–2.2 in flower in coco and hydro (lower in soil), and raise it only while leaf tips stay clean. Feed right through to harvest. Don't flush: it starves the plant while it packs on its final weight and resin. In late flower, taper only nitrogen and keep P, K, Ca, Mg, S and the micros fed.
Germinating seeds step by step
Cannabis seeds germinate in 1–5 days when kept at 22–27 °C (72–81 °F) with steady moisture and air. Soak for no more than 12–24 h, then either plant directly 0.5–1 cm (¼–½ in) deep in moist mix or wait in a damp paper towel until the root is 0.5–2 cm long and plant it root down. Expect 80–95 % from fresh seed; old seed is slower and lower.
Grow journal 101: what to log and why
A grow journal is a dated record of what you did and what the plant did: daily climate and watering, weekly photos, pH, EC and height, and every event (germination, transplant, topping, flip, first pistils, problems, harvest weights). Log both days since flip and days of flower. On GenetixBay, a journal tied to a GB-ID links your harvest back to the seed pack, and herm reports and results feed the open record other growers rely on.
Legal check before you grow
Before buying anything, confirm from official sources that home cultivation is legal where you live, then check the plant limit and how it is counted, possession limits for the harvest, where plants may be kept (indoors, out of sight, locked), tenancy and building rules, rules around minors, the ban on selling, and the rules for buying and importing seed. Laws differ by country, state, province and city and change often. This guide is a dated checklist and pointer list, not legal advice.
Lights for beginners: how much light, PPFD and DLI made simple
PPFD is how much usable light lands on the canopy each second (µmol/m²/s); DLI is the day's total (mol/m²/day = PPFD x hours x 0.0036). Aim for about 150–300 µmol/m²/s for seedlings (DLI 10–20), 300–600 in veg (DLI 20–40) and 600–900 in flower at 12/12 (DLI 26–39). Set height and dimming by measuring PPFD at the canopy and watching the top leaves, not by a fixed distance.
Pest prevention for beginners: keep them out, find them early
Most indoor pest problems arrive on clones, plants, soil, pets or clothes, and are caught too late. Prevent them in this order: quarantine anything new for 10–14 days, start with clean media and a clean room, hang sticky traps and scout under leaves with a loupe every week, release predatory mites before you have a problem, and act at the first find rather than at the first damage. Don't spray buds in flower. Clones can also carry hop latent viroid, so buy seed or test cuts.
pH made simple
Keep the water you feed at pH 6.2–6.8 for soil, 5.8–6.2 for coco and 5.6–6.0 for hydro; the accepted wider ranges are about 6.0–7.0 for soil and 5.5–6.5 for soilless, and drift within them is normal. Calibrate your pH pen with pH 7 and pH 4 buffers at least weekly, add nutrients before you adjust, change pH in small drops, and check runoff weekly. Wear gloves and eye protection with acids.
Photoperiod grow calendar: veg, flip, the 10–14 day transition, flower
Plan a photoperiod grow in five blocks: 2 weeks of seedling, 3–6 weeks of veg at 18/6 (24/0 also works), the flip to 12/12 (13/11 also works), a 10–14 day transition before flowering really starts, then the breeder's flowering time counted from that point. So a breeder's '8 weeks' usually means harvest about 9.5–10 weeks after the flip. Log both days since flip and days of flower.
Reading a seed listing and buying seeds wisely
Read a seed listing for what can be checked: seed type (feminised, regular or autoflower), parents and generation (F1, IBL, S1), flowering time and how it is counted, real grow journals, herm reports and lineage evidence. Distrust flower potency claims above about 35 % total cannabinoids, 'indica for sleep, sativa for energy' promises and famous names with no records. Buy small, from sellers with documented lines, and check that buying and importing seed is legal where you live.
Smell control and odour basics: negative pressure and carbon filters
Control grow smell by keeping the tent under negative pressure (the exhaust pulls out more air than comes in, so the walls suck in slightly) and sending every bit of exhaust through an activated-carbon filter rated at or above the fan's airflow. Size the fan for about one tent air exchange per minute plus 25–50 % for filter and duct losses. Replace the carbon every 12–18 months or when smell gets through, keep RH in range, and never use an ozone generator in an occupied home.
Soil first grow, week by week
A soil first grow is the most forgiving: a quality bagged potting mix with 20–35 % perlite in an 11–19 L (3–5 gal) pot, water at pH 6.2–6.8 when the pot feels light, plain water for the first 2–4 weeks while the mix's starter charge lasts, then a dilute feed at EC 0.8–1.6 mS/cm rising through flower. A photoperiod plant runs about 17–20 weeks seed to harvest: 3 weeks seedling, 3–5 weeks veg, a 10–14 day transition and 7–10 weeks of flower.
Spotting problems early: a daily five-minute check
Spend five minutes a day, at the same time, on one fixed routine: minute 1 the climate log, minute 2 the root zone (pot weight, reservoir or runoff), minute 3 the whole plant from a step back, minute 4 close-up under leaves with a loupe, minute 5 write it down. Most problems caught on day one are cheap to fix. When something looks wrong, check root zone and pH before blaming a nutrient, and change one thing at a time.
Telling sex and spotting herms: males, females and hermaphrodites
Sex a cannabis plant by its first solitary flowers at the nodes, usually visible about 4–6 weeks from seed under long days: a female shows a teardrop bract with two white stigmas, a male a small round ball on a stalk with no hairs. A hermaphrodite grows both, or sprouts banana-shaped anthers in the buds. GenetixBay's position: herms are mainly breeder error that stress reveals, late-flower 'bananas' are not normal, and herm plants are culled, never bred from. Good males are valued.
Training basics: LST, topping and tuck-don't-pluck
Training spreads a plant into a flat, even canopy so more bud sites sit in strong light. For a first grow, start low-stress training (bending and tying) in early veg, top photoperiods once at 4–6 nodes and allow 5–10 days of recovery, and tuck leaves out of the way rather than plucking them: leaves are the solar farm that feeds the buds. Autoflowers get LST only, not topping. Stop hard bending by mid-stretch.
Watering: how much, how often, by medium and pot size
Water cannabis by pot weight, not by the calendar: lift the pot, and water when it feels about half as heavy as just after watering. In soil that is usually every 2–4 days, giving about 20–30 % of the pot's volume to light runoff; in coco it is daily or more, to 10–20 % runoff. Seedlings get a small ring of 50–250 mL. Overwatering, not thirst, is the most common first-grow killer.
When to harvest: talk to her, and read the trichome mix
Harvest when a 60x loupe shows the trichome heads on the buds as a mix of a few clear, mostly cloudy and some amber. That mix is a matter of preference, not a hard rule. Count from the flip and add the 10–14 day transition before you trust a breeder's week count, keep feeding to the end (no flush), and skip the 24–72 h of darkness: both are myths.
Your first grow, start to finish: the master guide
A first indoor grow takes about 3–5 months from seed to jar: 1 week to set up and test the room, 1–2 weeks of germination and seedling, 3–6 weeks of veg (photoperiods), a 10–14 day transition after the flip, 7–10 weeks of flower, 7–14 days of drying and at least 2–4 weeks of curing. Use one to four feminised plants, a tent, one good LED, a fan and carbon filter, 11–19 L pots, a pH pen and an EC meter, and keep a journal.
