How To Build A DIY Grow Box, Step By Step Instructions

One of the phenomena that has been growing in recent years is indoor cultivation, i.e. the cultivation done inside your home. This allows you to grow plants of all kinds, with different climatic requirements and at any time of the year.

Follow this detailed guide to first learn how to build a DIY grow box at home. Basically the grow box is a kind of greenhouse that allows plants to have the right environment for their growth and reproduction.

Another decisive aspect for those who want to try this new “natural” experience, is certainly the fact that this grow box can be placed in any area of your home, you just need to check it periodically.

Building your do-it-yourself grow box is very simple, just get some materials and follow the steps below.

What Does It Take To Build The Grow Box?

The components needed to create a cheap grow box are many but easy to find, today we see how to build it with a tubular structure.

Below is a list of the elements to be procured to build a grow tent with dimensions 90x90x180 cm:

  • LED lamps;
  • a lighting timer;
  • aspirator;
  • hose;
  • activated carbon filter;
  • fan;
  • 15 m of tubulars with diameter from 2 to 5 cm;
  • 8 3-way joints;
  • zipper;
  • Cable ties;
  • insect retina;
  • reflective or Mylar sheet;
  • humidity and temperature meter that is recommended to keep the temperature and humidity range of your crop under control.

Procedure For The Construction Of A Grow Box

Now let’s see how to build a complete DIY grow box using the tubulars and other elements listed above.

Let’s Cut The Tubulars For The Grow Box

Take the 15 meters of tubulars, 16 mm in diameter and 1 mm thick or larger both in diameter and thickness, with one metre mark the measurements for 8 pieces of 90 cm and 4 pieces of 180 cm. Do the math well to avoid having pieces that are too short, after cutting, therefore unusable for the grow box.

At this point cut the tubulars with an iron saw or a flex, thus obtaining all the pieces of the structure that will make up the supporting skeleton of your DIY grow box.

We Make The Base And The Top Of The Grow Box

To make the base and the upper structure, take your 8 3-way joints and your 8 pieces of 90 cm tubular and make two identical squares, whose sides will be made up of the 4 90 cm tubular and the vertices of the 4 3-way joints, all oriented in the same way.

To make everything even easier and faster, we recommend that you position all the 3-way joints at each corner, placing them in a T-shape upwards, as shown in the picture on the right.

If you want you can add some adhesive or tape between joints and tubulars to increase the grip between the two, we recommend using adhesives that also allow you to disassemble the structure in the future, nothing lasts forever and in the same place.

Combine base and top of the grow box

Now it’s the turn of the 180 cm tubulars, insert them inside the joints that have been left free on purpose, in step n 2, both in the base and in the upper part of the structure, refer to the image on the left for more clarity.

Also in this case you can use some adhesive or tape to increase the tightness of the elements that make up the structure of your grow box.

The Complete Structure Of Your Grow Box

Now that the grow box’s supporting structure is ready and is a kind of parallelepiped, you can continue with the coating of Mylar or other material.

Remember, however, that it is better to use a material with the surface that will go inside the grow box more reflective, therefore less opaque, possible.

In this way all the light emitted by your indoor grow lamp will be absorbed by the plant and not the opaque sheet.

Measurements and Cutting of the Mylar sheet

To install the Mylar sheet, or other reflective material, of your grow box, simply take measurements of the sides of the structure, and the top. Doing so will then create 4 rectangles 92×182 and two squares 92×92, it is advisable to consider a few more cm for the seams.

We usually recommend adding 2cm on each side. At this stage you can also shape, again with your reflective material, a cover strip for the pot of your plants, because even the normally opaque pot would absorb some of your light and take some of it away from the plants.

Sewing Reflective Cloth or Mylar

Cut the cloth in Mylar or another type of reflective fabric following the measurements indicated in the previous point.

At this point we will proceed with the seams that, as mentioned above, it is recommended to make them slightly wider, to allow the sheet to slide easily on the structure.

Then you have to take the 4 rectangles and sew them on each other from the side of 182 cm, allowing you to proceed later also with the upper and lower part of 92×92 cm.

Opening The Grow Box

Every grow tent needs an opening, usually with a hinge, to access its interior.

So it is essential to remember that one of the 4 rectangles 92×182 cm must be cut to allow the sewing of a zipper, this zipper will then serve to open and close when necessary your grow box.

Then sew the latter between the two parts of the cut, so that you have an access opening to the grow box. This will allow you to insert the desired items, such as your pots and plants, into the DIY grow box.

Slot For The Passage Of Air

With the structure of the grow tent ready you can proceed with the cutting of the sheets of Mylar, or other reflective material, to allow the insertion of the hose, which on one side, inside the grow box, will be connected to the activated carbon filter and on the other side to the air aspirator to allow the elimination of odours and facilitate the exchange of air, thus also improving the process of photosynthesis chlorophyll.

Cut the sheet forming a rectangular slit to which you will apply the anti-insect retina, this will allow the entry of new air and filter any insects or external agents potentially harmful to the plant.

We suggest to create the slit in the low angle and diametrically opposite the suction, forcing the air to follow a transversal path, therefore longer, inside the grow box, realizing the best possible air exchange.

Cable Ties To Support The Hanging Elements

When you insert the activated charcoal filter and the air aspirator you need to fix them to the top of your grow box somehow.

You can use what you want and that you have available, but if you have bought all the material indicated at the beginning of the article we suggest to use clamps.

These clamps, cheap and resistant, will allow you to hold the elements in the best possible way, without running the risk of falling.

The clamps will also be comfortable tomorrow if you want to move or disassemble the filter for maintenance or replacement.

CO2 Distributor And Air Exchange

If necessary, it is also possible to insert a CO2 distributor to help the plants breathing.

The right amount of CO2 will improve the yield of your crop, helping you to achieve the desired results.

If you have an axial introducer at your disposal, you can install it in place of the slot and insect screen indicated in point 8, as shown in the diagram below.

The LED lamp

The time has come for the LED lamp, place it at the top and center to ensure the right distribution of light, thanks to the hooks provided will be an extremely easy operation.

Once set up, remember to connect the lamp to the timer, an inexpensive and convenient object for everyone, and especially for those who can not always be at home to check, which allows you to give the right hours of light and then the right alternation day / night to your cultivation.

The timer is used to avoid possible mistakes or human forgetfulness that often ruin the much desired harvest, thus throwing all the time you have dedicated to this small “garden” do it yourself.

The Fan

Insert a fan to allow air movement inside the grow tent, thus ensuring that a homogeneous temperature is maintained inside the grow box.

This is because without the fan you could create air pockets, hot at the top and cold at the bottom, which will certainly not be good for growing.

Also this an inexpensive tool, easy to use and install, could be used in combination with another timer, different from the lamp timer.

Grow Box Lighting

It is advisable for a successful cultivation in your grow box, to guarantee about 18 hours of light per day thanks to the timer. The minimum recommended is 12 hours per day and the maximum is 20 hours.

So, thanks to the lighting the plants can have a good yield and good growth, sometimes, as mentioned above, it is also possible to give 20 hours of lighting without doing so for long periods.

Once the vegetative phase of the plant is finished, you have to bring the timer to about 12 hours, it is possible to make the change in only one day, without passing through a gradual reduction, the plant will react more quickly and after a few days will begin to bloom.

In practice, the simulation of several hours at night stimulates the flowering of the plant, while the abundant light will stimulate its growth, so it is important to adjust the day/night cycle to obtain the desired result.


One of the key elements for plant growth in a grow box is undoubtedly the temperature.

To allow effective growth, you need to maintain a temperature of between 20 and 28° C in your grow room (a term used by the manufacturer Secret Jardin who has created a very economical line in case you don’t want to try your hand at DIY construction).

If the latter is exceeded, it is important to try to use the fan and the air extractor that will lower the temperature of the room.

To make the passage easier, simply connect the air extractor and the fan to the thermostat, all to make the process automatic, thus avoiding reaching temperatures too different from those indicated before.

On the other hand, it is different when the temperature drops, so you have to try not to get below the ideal temperature for growth. So it’s important to avoid large changes in temperature, otherwise your cultivation will suffer. Here too, a thermostat and a heater can help you not to let the temperature drop too much.

Humidity And Atmosphere

Another important factor for the grow box is the humidity, this if too high, could cause big problems. The first could be the emergence of different types of mold that will then ruin your crop.

Each type of plant requires a certain amount of humidity, inside the grow room usually a level of about 60-70% is used, which will decrease to about 50% during flowering.

When the humidity rises too much it is possible to activate the air extractor connected to the activated carbon filter, in this way it will be possible to restore the desired amount of humidity and also eliminate any unwanted odors.

Another fundamental parameter, not to be neglected in order to have the desired results, is the atmosphere inside the grow box, ensure your plants a correct exchange of air. In this way you will help your cultivation to grow luxuriantly.

If you put a plant in a grow box that does not allow it to breathe properly, it risks not bearing the desired fruit or even dying, which is why we hope that our advice will allow you to achieve satisfactory results or even exceed them.

What To Grow In The Grow Box?

Precisely for this topic we recommend you to read the article: How to grow microgreens (microgreens)

We remind you that if you want to avoid construction you can order one of our custom made grow boxes with Oxford sheets from 610D up to 1680 D!

And If You Want Everything Ready To Use

Growledlamp has just created a new cultivation system designed for those who want to get closer to this world and bypass all the technical aspects of environment and lighting at a very low cost.

We are talking about the new grow box complete LED 600 Watt low consumption (like a 90 watt bulb), grow box with 610D resistant fabric, reflective interior with 95% CRX, super silent air aspirator, aluminum filter with activated carbon, aluminum tubes with self-locking couplings, clamps and lamp holder.

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