You can spend a fortune on a first grow, and most of it will be things you didn't need yet. This is the list that actually gets a cannabis plant from seed to jar, in the order to buy it, with what each thing is for — and a short list of what to skip until your second grow. If you'd rather have it sized for your exact tent, the setup planner does that in four clicks.
The core kit (you need all of this)
1. The tent
A 2×4 for most people, a 2×2 if space is tight. Steel frame, good zips, light-tight, a removable floor tray. For photoperiod plants, 72 inches tall is the comfortable minimum — they stretch after the flip. The reasoning is in What size grow tent do you need?.
2. The light
Spend the most here. A full-spectrum white LED drawing 30–40 W per square foot of floor — 100–150 W for a 2×2, 200–300 W for a 2×4 — with a dimmer. Cannabis in flower wants 700+ PPFD across the whole canopy, and the light is what decides bud density. How much light does a grow tent need? has the tables.
3. Inline fan and ducting
A 4-inch inline fan for anything up to 3×3, 6-inch for a 4×4, on a temperature-and-humidity controller if the budget allows. Plus a few feet of matching ducting and two clamps. Sizing is in Sizing a grow tent fan.
4. Carbon filter
Not optional for cannabis unless you're certain nobody will ever smell it. Flowering plants smell strongly from about week 3 of 12/12, and it gets through walls. Same diameter as the fan, rated CFM at or above the fan's, hung at the top of the tent.
5. A small circulation fan
A 6-inch clip-on inside the tent, pointed across the canopy. Ten to fifteen dollars, and it's what stops bud rot starting in still air between the flowers.
6. Pots and a medium
Fabric pots: 3 gallon for autoflowers, 5 gallon for photoperiods. They air-prune roots and are very hard to overwater. Fill with a quality potting mix — not garden soil, not "moisture control" mixes — or a coco-coir/perlite blend if you'll feed at every watering. Fabric pots vs plastic has the sizes.
7. Nutrients
A basic two- or three-part liquid range with a veg and a bloom formula, plus cal-mag. Start at a quarter of the dose on the bottle — every label is generous — and work up only if the plant looks pale. How to use nutrients properly has the stage-by-stage routine.
8. A timer
A mechanical or digital plug-in timer for the light. 18 hours on for veg, 12 for flower; autos stay on 18/6 throughout. Consistent, uninterrupted dark periods are what keep a photoperiod plant flowering — this is not the thing to save $12 on.
9. A thermometer / hygrometer
A cheap digital one with a probe hung at canopy height. Aim for 72–85 °F and 45–60% in veg, cooler and drier through flower. The targets by stage are in Temperature and humidity.
10. Water and something to measure it
Tap water is usually fine; let it sit an hour. A pH pen (6.3–6.8 in soil, 5.8–6.2 in coco) and, if you're feeding minerals, an EC/TDS meter. Budget ones are accurate enough; calibrate the pH pen when you buy it.
11. Seeds
Feminized seeds from a reputable bank — regular seeds are half males you'll have to spot and remove. For a first grow, autoflowers are the forgiving choice: no light-schedule change, done in 10–12 weeks, small enough for any tent. Photoperiods yield more and can be trained, but the flip and the stretch are two more things to get right. Photoperiod vs autoflower lays out the choice.
12. A jeweller's loupe
A $10 60× loupe is how you tell when to harvest — cloudy trichomes with a little amber — rather than guessing from the calendar. See When to harvest.
What to skip for now
- CO₂. Only helps once every other factor is perfect and the light is very strong. Not a first-grow thing.
- Humidifiers and dehumidifiers. See what the tent does first; a fan controller solves most humidity problems on its own.
- Trellis nets and training kits. A few plant ties and bamboo stakes do the job in a small tent.
- UV or far-red supplemental lights. Refinements on top of a good light, not a substitute for one.
- Automatic watering. Learn to read the plant first; automation of a thing you don't understand automates mistakes.
- A second tent for seedlings. A shelf and the same light at 30% is fine.
- Boosters, enhancers, finishers. Base veg, base bloom, cal-mag. That's the range.
Budget, roughly
For a 2×4, the core kit lands around $400–600 at current prices, with the light a third of that. The 2×2 version is closer to $250–350. A 4×4 with a proper bar light, 6-inch fan and filter is $700–1000. Cheaper kits exist and mostly save money on the light, which is the one place not to.
The order to buy
- Tent (so you know the exact space)
- Light (sized to the tent)
- Fan, ducting, filter
- Everything else in one go — pots, medium, feed, timer, meter, clip fan, loupe
- Seeds last, so they're not sitting around while you shop
Buy the light after the tent so you can check its PPFD map against the real floor size.
First-grow mistakes worth avoiding
- Overwatering. The number one killer. Fabric pots help; so does lifting the pot before watering.
- Light too close. Start it further away and dimmer than you think, then bring it in.
- Too much feed. Quarter dose. Really.
- Light leaks during the dark period. Hermaphrodites and re-vegging come from this. Check the tent in a lit room with the flaps closed.
- No airflow. Still, humid air in flower grows rot. The clip fan is not optional.
- Harvesting early. Buds put on weight and potency in the last two weeks. Read the trichomes, not the seed bank's "8 weeks".
- Impatience. Most problems fix themselves in a week if you stop changing things.
Get these things, resist the rest, and the first grow will be about learning the plant rather than fighting the equipment.
As an Amazon Associate we earn from qualifying purchases made through links in this guide — at no extra cost to you. Picks are ours; prices and stock are Amazon's.