Grow Tents and Grow Tent Accessories


image of a grow tent with plants growing inside under red LED grow lighting

Do I really need a grow tent?

Probably the very first question that an indoor gardener will ask herself is where can I grow my plants? Since most plants grow best at a specific temperature and humidity range as well as under specific periodic bright lighting arrangements, a designated enclosed space is needed if you want your plants to grow undisturbed to their full potential. If you have the space available, you can allocate a room to become the grow room. If, like most of us, you don’t happen to have a spare room just lying around, then the next best option is the grow tent. Grow tents offer convenient and practical ways to create the perfect environment for your plants, allowing you to control things like temperature, humidity and light precisely, thereby optimising plant growth. They also have the added benefit of isolating the growing environment away from anyone else so that people in the vicinity are not disturbed by conditions in the growing environment such as its intense lighting.

Ok so I need a grow tent, what should I be looking for?

There are several factors that are important to look at when purchasing a grow tent.


It is important for your plants to have enough headroom for them to grow, so you really need to know how they will perform beforehand so that you can get the right size tent to keep them healthy and maximise yield. Importantly when calculating the size of the grow tent, you will also need to take into account the minimum distance away from the grow light that the plant canopy needs to stay in order to remain healthy. You don’t want your plants growing into the lamps and then dying off due to the excessive heat given off by them. Importantly, if you are using LED grow lights which generate much less heat, the plants can grow much closer to the light source than with other types of lighting such as HID lamps. Generally speaking, when choosing a grow tent, taller is better (as long as your room ceiling is high enough to accommodate it) with the added advantage that you won’t have to squat down as much to access you plants with taller grow tents.


Thickness of the grow tent fabric is a factor in how robust the grow tent is and how long it will last. In addition, the thicker the material, the less light, odours and noise will escape from the grow tent. Thickness is usually given in Denier (D). The higher the Denier number, the thicker the material fabric and generally the higher the quality of the grow tent. The most common thicknesses available are 1680D, 600D, and 190D. Grow tents with a fabric thickness of 1680D can be rather expensive whereas those with a thickness of 600D often represent the right balance between recommended thickness and price.


There are several things to keep in mind here. First and foremost, is the frame. This can be made out of plastic or metal. Generally speaking, metal frames are better, and the thicker the poles, the more sturdy the tent. In addition, the corner brackets that hold the frame together ideally should be made of metal although plastic ones will suffice but will have a shorter life. The final durability characteristic to look out for are the zippers. The zippers zip close the access points to the grow tent and these need to be of high quality as you will be regularly opening and closing the tent. If you have been unlucky enough to have a zipper break, then you will know how difficult it can be to keep the light, odour and noise completely isolated from the outside environment without a functioning zipper.

Reflectivity of interior lining

For the inner lining of the grow tent, you generally have 2 choices: Silver Mylar or a white surface. Silver Mylar provides a better reflective surface than white-lined tents and since heat is rarely a problem with LED lighting, this is the recommended lining of choice for your grow tent. However, Mylar-lined tents can get excessively hot if grow lamps other than LED grow lights (eg. HID lamps) are used, so white-lined tents will perform better when using traditional grow lighting.

Other Features

Spillage Protection: Ideally the grow tent will have a waterproof floor covering or tray to protect against accidental spillages, which happens to almost everyone at some point. It is also especially important when working with hydroponic systems, since blockages and other mishaps can lead to nutrient solution overflow.

Popular Grow Tents

Make Dimensions
(L x W x H)
Black Orchid

0.25m3Mylar fabric
Heavy-duty zips
Metal frame with metal push-fit corners
Secret Jardin

0.5m3Lined with 95% reflective hammered effect Mylar fabric
Equipment bars to support lamps, and carbon filters
Strong Zip
Fabric Inner Tray
Completely washable fabric material

2.9m3UltraLux material
Tivax zips
2 inline 10" socks for use w/ air-cooled lighting
3 passive air fine (anti-mite) mesh vents

Black Orchid Grow Tents

Black Orchid Hydro-box grow tents are well made grow tents consisting of a metal frame held together by metal push-fit corners together with metal hanging bars at the top to which grow lights can be securely attached. This is unlike cheaper, less well-made grow tents where the frame and the corner attachments may be made of less durable plastic. In addition, Black Orchid grow tents are covered by a high-quality fabric lined on the inside with diamond-patterned Mylar and which is all fastened together using high-quality zippers. The tents are equipped with 8-inch maximum diameter openings for fans and carbon filters as well as smaller entry points for cables, all of which are made light-proof via the use of two layers of drawstrings that work very well to keep light from either entering or exiting the grow tent. It should be noted that the walls of the grow tent are not rigid but are of soft fabric, so one should expect their new grow tent, when first set up, to look quite creased, especially after having sat in packaging for a while, and it will not look as neat and tidy (and rigid!) as in the advertised pictures. One other nice touch from Black Orchid is that their grow tents come with a removable spill tray that is useful in protecting sensitive flooring.

On a slightly more negative note, new owners of Black Orchid grow tents have reported that some packages do not contain any assembly instructions. However, this is merely a minor annoyance as setting up a grow tent is not rocket science and most people will have no trouble figuring out how to put it together without any written help. Another issue some users may dislike is that although discreet brown box packaging is used for delivery, less than discreet information about the grow tent is visible on the outside of the packaging.

Overall, Black Orchid grow tents have a well thought out design and are good value for money that most growers will find invaluable in their growing setups. Black Orchid offer a wide range of sizes catering to almost all types of indoor growers and all types of growing installations. Growers purchasing Black Orchid grow tents for the first time will not be disappointed!




Grow Tent Accessories

Ventilation systems

So you finally have your swanky new grow tent, you’ve assembled it together with the grow light that you’ve purchased after reading all (ok, ok, SOME) of my other stuff on LED grow lamps, and now you’re itching to position your plants inside the grow tent and set it on its way. But not so fast! You are going to need a few other pieces of kit which are essential tools in keeping your plants healthy and vibrant throughout the growing cycle.  One of the most important is a ventilation system for the grow tent which generally consists of ducting, an inline extractor fan and a carbon filter. The ventilation system serves two functions: first, it changes the air within the grow tent to keep it fresh, mostly to keep a consistent supply of CO2 for the plants to use, and secondly, it removes excess heat. You can get away without a ventilation system in a very small grow tent assuming you are using LED lights, but in larger tents or with more traditional forms of grow lighting, a ventilation system is essential. If a ventilation system is not used, plant growth may be inhibited by inadequate CO2 levels and increased temperatures or humidity which are sub-optimal for plant growth (assuming the plants survive in the first place!). And to really top it off, increased temperature and humidity within the grow tent can also lead to mould formation and plant rot, stuff you definitely don’t want going on in your grow tent.

Extractor fan size

Ventilation systems come in several different ‘sizes’ to cater to the different-sized grow tents and you will need to identify the system that will work effectively for your grow tent. In order for a ventilation system to be effective, it will need to completely change the air within the grow tent, at the very least, every 3 minutes or 20 times per hour in order to keep the CO2 that plants need at optimal levels. However, you will want a ventilation system that can do much more than that in order to remove the excess heat given off by the grow lighting, especially if more traditional forms of grow lighting are used.

Carbon filters

The carbon filters are necessary to prevent the odours from the plants and growing media from entering the room housing the grow tent but they are only important if you are venting the air of the grow tent directly into the room. However, if it is being vented to the outside (assuming you are not annoying the neighbours with the exhaust), then the filter becomes unnecessary, although in the UK we don’t always have the luxury of easily installing an external vent.

Intake fan

An intake fan can also be installed to force fresh air into the tent but in many cases, it is unnecessary if your extractor fan is working optimally as the negative pressure created by air extraction will force air into the tent via the intake openings, unless of course you have a large grow tent.


The extraction ducting should be positioned so that air is extracted from the top of tent to remove warm air first. The fresh air intake openings should be positioned on the opposite side, towards the bottom of the grow tent, so that fresh air flows up through the plant canopy towards the exit.

Popular Ventilation Systems

System size Volume of extracted airMaximum grow tent size
(& max HID configuration)
What's in the box
4" system

100 m3 / hour120cm x 80cm x 180cm- Inline extractor fan
- Carbon filter
- Aluminium ducting
- Ducting clamps
- 6" Clip fan
4" system

187 m3 / hour120cm x 120cm x 200cm
(with 250W HID grow light)
- Inline extractor fan
- Carbon filter
- Aluminium ducting
- Ducting clips & tape
5" system

280 m3 / hour240cm x 120cm x 200cm
(with 2x 400W HID grow lights)
- Inline extractor fan
- Carbon filter.
- Aluminium ducting
- Ducting clips & tape

Temperature and humidity sensors

Image of the Black Orchid temperature and humidity sensorAnother important accessory is a temperature sensor which is essential to make sure that your plants stay within their optimal temperature range. This is especially important if you end up using grow lamps such as HID lighting that generate a lot of heat. If you have a household thermometer that you can position within the grow tent, then that should suffice but these days for a few pounds, you can get an all-singing, all dancing digital sensor which also provides you with humidity data that you need for optimal plant growth. For ideal plant vegetative growth, the temperature target range that you will be aiming for will be 21oC -28oC. As for humidity, you are looking for a relative humidity (RH) of 50%-80% as the target range. Black Orchid is a well-known brand in the hydroponics / indoor-grow community and they have a useful temperature and humidity meter specifically designed for us indoor gardeners (see picture on the left).

Timer Switches

Image of a mains socket timer switch for controlling a grow lighting schedule

Another piece of equipment that you will be hard pressed to do without is a timer switch. For LED grow lighting, your bog-standard timer switch should be fine to use. One of my favorites is the Silverline Plug-In Mechanical Timer (see picture on the left) due to its simplicity, excellent value, and most of all, its lack of noise, unlike many other brands of timers that can produce an incessant clicking noise.

Image of a mains socket timer switch for controlling a High Intensity Discharge (HID) grow lighting schedule

However, LED grow lighting is not yet used by everyone so it is important to mention that with HID lighting, you should NOT use your normal timer switch that you might have lying around the house because it has not been built for such high loads. A timer switch specifically designed for HID lighting (such as the one in the picture on the right) is essential.

 Posted by at 1:31 am