The Shopping List (and the Overspender)

What You Need to Know

A grow room isn’t a room with a plant in it. It’s a controlled environment: light-tight, air-managed, containable. That’s the whole reason a sixty-euro tent beats a free spare bedroom. The spare room leaks light, holds humidity in the plasterboard, and lets the smell colonise the landing. The tent zips shut and gives you a system with an exit route. You’re not buying a box. You’re buying control.

For Level 1 — keeping one plant alive — you need exactly four categories of kit and a couple of consumables. Everything else on the shop wall is for later, or for someone else’s grow. The skill this lesson teaches isn’t really shopping. It’s knowing the difference between what the plant needs and what the marketing wants you to want.

The Four Things That Actually Matter

1. The tent. It’s light-tight by design, the inside reflects 90–95% of your light back onto the plant (a magnolia wall manages about 70%), and it has ports for ducting and cables. For one plant, an 80x80cm tent is the sweet spot — room to work, enough headroom for a moderate stretch, and forgiving if she gets taller than you planned. A 60x60cm tent is the smaller learning box: fine for one short autoflower, tight on headroom once the light and filter are hung.

2. The light. This is the one purchase where what you spend directly sets what you harvest. You can recover from average soil. You cannot make up for a weak light. For one plant in an 80x80, a proper LED from a real manufacturer is the call in 2026 — lower running cost, less heat, and a spectrum that does both veg and flower from a single fixture. The number that matters is wall draw — the watts it actually pulls from the socket — not the fantasy wattage on the listing.

3. The fan (extraction). This is the lungs of the tent. An inline fan pulls air through a carbon filter and out through ducting. It does three jobs at once: removes heat, removes humidity, and scrubs the smell. The carbon filter is your reputation in a metal tube — without it, the neighbours learn your hobby. You’ll also want one small clip fan inside to stir the air, which stiffens the stem and keeps mould from settling.

4. Pots. Fabric pots, every time. When a root hits the breathable wall, the air outside prunes the tip and the plant branches new roots further back — a denser, healthier root zone. They drain better and they forgive the overwatering instinct that every beginner fights. A 11–15L final pot suits one plant, plus a small starter pot or cup for the seedling stage.

Consumables: a quality bag of cannabis-suitable soil from a grow shop (not multipurpose compost from a garden centre — that’s a later lesson’s mistake waiting to happen), and your seed, which Lesson 3 covers.

Seb’s Corner — Negative Pressure

[SEB] Negative pressure. The state where the extraction fan pulls more air out of the tent than the passive intake lets in, so the tent walls suck slightly inward. Why it matters: under negative pressure, every bit of air inside — heat, humidity, and smell — is being drawn toward the carbon filter and out, instead of leaking through the zips. It’s what makes the filter actually work. The check is simple: fan on, walls sucking in gently = good. Walls ballooning outward = air is escaping unfiltered, and so is the smell.

---

How To Apply This

You’re buying once, properly. Here’s the order.

1. Measure your space first. Ceiling height especially. Most rooms sit at 2.3–2.4m. A 1.8m tent often makes more sense than a 2m one once you account for the frame, the ducting above it, and the carbon filter eating the top of the inside. Match the tent to the space, not the space to the tent.
2. Match the light to the tent. A light that covers an 80x80 footprint evenly. If a “1000W LED” costs sixty euro, the wattage is fiction. Look for the actual wall draw stated plainly.
3. Size the fan to the tent. For an 80x80, even a modest inline fan handles it with the carbon filter attached. Get the filter at the same time — fan and filter are one purchase, not two.
4. Get fabric pots and one good bag of soil. A starter cup and one 11–15L final pot is all you need for one plant.
5. Set it up and test it before the seed goes anywhere near it. Fan on, room dark, tent zipped. Look for light leaks. Fix any before you plant. This two-minute check is the most important pre-grow step there is.

That’s the list. Tent, light, fan-and-filter, pots, soil, seed. You can keep one plant alive on exactly this.

---

Watch Out For

• The Overspender. Walks in having decided more gear means a better grow, and leaves with a 240x120cm tent, three lights “for coverage,” a CO2 kit, an autopot system, and seven bottles of nutrients — for one plant. Every one of those is a variable that can go wrong, and most of them solve a problem you don’t have yet. The Mansion tent with one plant in the middle looks like a traffic cone in a car park: too much air volume for one plant to influence, so the environment swings all over the place. Buy for the grow you’re doing, not the grow you’re imagining.
• The “free” spare room. It’s not free. The cost is mould in the plasterboard, light leaks that confuse the plant, and a house that smells like a dispensary. A sixty-euro tent prevents the first disaster and pays for itself.
• Skimping on the light to splurge elsewhere. A fancy pot doesn’t double your yield. The light might. If money’s tight, the light is the last place to cut.
• Buying nutrients now. You don’t feed for the first couple of weeks anyway (Lesson 9). Leave the bottles on the shelf until the plant asks for them.

---

Quiz

1. (Multiple choice) What’s the recommended tent size for keeping one plant alive comfortably?

• a) 60x60cm
• b) 80x80cm
• c) 120x120cm
• d) 240x120cm

2. (True / False) The wattage printed in a cheap LED listing is a reliable guide to how powerful the light is.

3. (Multiple choice) What does the carbon filter on your extraction fan do?

• a) Adds CO2 for the plant
• b) Scrubs the smell out of the air before it leaves the tent
• c) Cools the light
• d) Feeds the roots

4. (Scenario) You’ve a 60x60 tent set up. You turn the extraction fan on and the tent walls puff outward. What’s gone wrong, and why does it matter for security?

5. (True / False) Fabric pots are recommended for beginners mainly because they look nicer than plastic.

---

Answer Key

1. b) 80x80cm. Room to work, headroom for a stretch, forgiving of a taller plant. A 60x60 works for one short auto; a 240x120 is a money pit for a single plant.
2. False. Cheap listings inflate wattage wildly. The only number worth trusting is the actual wall draw, stated plainly by a real manufacturer.
3. b) It passes the air through activated carbon and removes the odour before it exits the tent.
4. You’ve got positive pressure — intake is stronger than extraction (or the exhaust is blocked/kinked). It matters because unfiltered, smelly air is now escaping through every gap instead of being pulled through the filter. You want the walls sucking inward.
5. False. They air-prune the roots, drain better, and forgive overwatering. The looks are not the point.