Everything you need to know about what size grow tent do I need is right here, from The Horticulture Company’s in-house growing experts. No two growing setups are exactly the same — and grow tents come in a wide enough range of sizes that choosing the right one isn’t always obvious. Whether you know exactly how many plants you want to grow, or you’re working from a specific available space, this guide will help you arrive at the right choice for your situation.
Start With Your Available Space
Before looking at tents, measure the space where your grow will live. This is the single most important step — buying a tent that doesn’t fit your available area is a frustrating and avoidable mistake.
When measuring, allow for:
- The tent’s full footprint, including the frame overhang (usually 2–5cm per side beyond the stated dimensions)
- At least 30cm of clearance on each accessible side for maintenance and access
- External space for a reservoir, extraction equipment, and nutrient storage if growing hydroponically
- Sufficient ceiling height for the tent plus your chosen grow lights at the correct hanging distance
How Much Space Do You Need Per Plant?
Plant footprint depends on how you train your plants and how long you allow them to grow in the vegetative phase. As a practical starting point:
- Compact or trained plants: approximately 30 x 30cm of floor space per plant
- Standard indoor plants: approximately 60 x 60cm per plant
- Larger, untrained plants: up to 90 x 90cm per plant
If you plan to train your plants — using techniques like low stress training (LST), topping, or a Screen of Green (ScrOG) net — you can fit more productive canopy into less floor space. This is one of the most effective ways to maximise yield from a smaller tent.
Grow Tent Size Guide by Plant Count
What size grow tent for 1–2 plants?
An 80 x 80cm tent is a solid choice for one to two plants. It’s compact enough to fit most indoor spaces while providing enough room to work comfortably. A 90 x 60cm tent is a good alternative for narrower spaces — it fits standard doorways and works well in corridors or alcoves.
What size grow tent for 2–4 plants?
A 120 x 60cm tent handles two to four smaller plants well. A 120 x 120cm tent is the most popular all-round choice for home growers — providing comfortable space for three to four well-developed plants, or up to eight smaller ones. The square footprint is particularly efficient for square-pattern grow lights.
What size grow tent for 4–6 plants?
A 150 x 150cm tent gives you meaningful additional floor space for a larger grow. Well suited to growers who want to run more plants, use a ScrOG setup, or incorporate multiple growing containers alongside a hydroponic reservoir.
What size grow tent for 6–9 plants?
A 240 x 120cm tent comfortably accommodates eight full-sized plants or up to 25 smaller ones. The rectangular shape works particularly well in garages or outbuildings.
Does Tent Height Matter?
Yes — and it’s often overlooked. Most indoor growing setups require:
- 30–45cm minimum clearance between the top of the plant canopy and the grow light
- Space for the light fixture itself (typically 15–30cm depending on the unit)
- Space for a carbon filter inside the tent if your extraction is routed internally (typically 30–50cm)
A standard tent height of 200cm gives a comfortable working margin for most setups. If you’re working with a low ceiling, look at purpose-designed low-profile tents from Bloomroom, which are specifically built for attic and loft growing.
Consider Running Two Tents
One of the most effective upgrades for a serious home grower is running two separate tents — one for propagation and one for the main grow. This lets you start your next batch of seedlings while your main crop is still in the flowering phase, eliminating the gap between harvests. A typical two-tent setup might pair a compact 60 x 60cm propagation tent with a 120 x 120cm or 240 x 120cm main tent.
Our Top Recommended UK Grow Tent Sizes
| Size (W x D x H) | Best For | Plants (approx.) |
|---|---|---|
| 80 x 80 x 180cm | Beginners, compact spaces | 1–2 |
| 90 x 60 x 160cm | Narrow spaces, propagation | 1–3 |
| 120 x 60 x 180cm | Slim rectangular rooms | 2–4 |
| 120 x 120 x 200cm | Most popular all-rounder | 3–5 |
| 150 x 150 x 235cm | Larger home grows | 4–6 |
| 240 x 120 x 200cm | Garages, serious growing | 6–9 |
| 300 x 300 x 235cm | Dedicated grow rooms | 12+ |
Frequently Asked Questions
Yes — buying slightly larger is almost always the better choice. Moving up one tent size typically costs only a modest amount more, and the extra space makes managing equipment, ventilation, and canopy training significantly easier. A tent that feels slightly too large when empty will feel exactly right once lights, fans, and training systems are in place.
We stock proven brands including Secret Jardin, Green Qube, Bloomroom, and Mammoth. Secret Jardin is particularly popular for build quality and longevity. Bloomroom’s attic-specific range is worth considering if ceiling height is a limiting factor for your space.
Aim for 200–250W of quality LED output per square metre of growing area. For a 120 x 120cm tent (1.44m²), a 250–300W LED is a solid match. For a 240 x 120cm tent (2.88m²), 400–600W of LED output is the right range. Browse our LED grow lights range for specific model recommendations by tent size.
Shop the Products in This Guide
Browse by category: Gorilla Box Grow Tents, Grow Tents and reflective sheeting, Loft Grow Tents, Reflective Sheeting, Secret Jardin Grow Tents, Carbon Air Filters, Ducting and Fittings, Extraction Fans and Kits.
Shop featured products: GORILLABOX DELUXE TENT, GORILLABOX ROOF TENT 1.2 X 1.2 X 1.8 M, WHITE LIGHTITE SHEETING, BUDBOX PRO 1.2 X 2.4 X 2.2 M (SILVER).