How to Increase Yield (Growbox Guide)

⚠️ Legal Notice

Cultivating cannabis other than industrial hemp is prohibited in Poland. Growing industrial hemp requires a valid permit. By reading this guide, we assume you already possess such authorization or plan to obtain it before starting cultivation.

What Is a Growbox?

A growbox is a specially designed cultivation tent. It can be set up quickly, provides optimal grow conditions thanks to reflective material, observation windows, cable and ventilation ports, and—most importantly—ensures 100% light and odor tightness (when used with a carbon filter).
Thanks to zippered doors, you can easily access your plants at any time.

Should You Build a Growbox Yourself?

Absolutely not. DIY wooden constructions are difficult to seal, require foil lining and ventilation openings, consume time, create unnecessary costs, and are hard to move. Professional growboxes solve all these problems.

How to Choose a Growbox?

Modern grow tents come in many variants differing in size, material thickness, zipper placement, and ventilation ports. Generally, each of them can provide ideal growing conditions.

Our recommendation is Royal Room — a Polish manufacturer focused on quality, functionality, and fair pricing. It’s the best value-for-money option on the market.

How to Choose the Size of a Growbox?

40×40×160 cm — 1–4 plants

• 1 photoperiod plant in 20–40 L, 4–6 weeks of veg
or
• 4 plants in 10–11 L, 2 weeks of veg
Autoflowers: 4 plants in 9–14 L

80×80×160 cm — 4–8 plants

Photoperiods: 4 plants in 14–25 L, 3–5 weeks of veg
Autoflowers: 8 plants in 10–14 L

100×100×180 cm

Ideal for tall genetics
5 photoperiod plants or up to 8 autoflowers

Note: Too many plants reduce yield due to stretching, uneven ripening, and weaker bud quality.

120×120×200 cm — Most Popular

5–8 photoperiod plants or 6–12 autoflowers

150×150×200 cm

Difficult to illuminate evenly with HPS
Best choice: LED 600–1000W (e.g. GOAT, LUMATEK)
5–9 photoperiod plants or 6–14 autoflowers

Bigger Growboxes (200×100, 200×200, 240×120, 300×150, 300×300)

The larger the tent:

• fewer filters required

• fewer fans needed

• lower cultivation cost per m²

If you don’t want to choose equipment yourself, use complete GROWBOX KITS.

A properly selected growbox is the first step toward achieving large, healthy, and high-quality yields.

FAQ – Growbox Essentials

How many plants fit in a growbox?
Depends on size and veg length. Small tents fit 1–4 plants, bigger models even a dozen.

Does a growbox increase yield?
Yes — it ensures optimal light, ventilation, temperature and humidity, directly boosting yield quantity and quality.

Can I build a growbox myself?
Technically yes, but it’s not worth it: it’s more expensive, harder to seal, and less practical than a professional tent.

Which growbox is the best?
Royal Room consistently receives top reviews — perfect balance of price and quality.