How To Make A Marijuana Clone Box In 7 Steps

In this article I’ll illustrate exactly how to make a box for germinating and cloning marijuana plants.

The clone box will be separated into three levels, each with its own individual climate. One level is for germination, one is for growing seedlings and clones, and the last one is to vegetate and grow a few mother plants.

This system will be located in a cabinet in my office, so it needs to be clandestine.

I can’t have any visitors knowing about the marijuana plants in there. It must be locked, and it cannot release any air or light. I’ll list the items I used at the bottom of this article.I will install the following three items:

– Lights
– Exhaust fan with carbon filter (for fresh air)
– Thermo/hydro meters (to control and measure the temperature and the humidity)

To increase the amount of light reflection, I will also make use of some white mylar foil.

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    The cabinet is quite large but I need to germinate a few hundred marijuana seeds every week. There are a number of ways to build a germination/clone box, but this is just one example. Use your own creativity when constructing yours and send me photos of your own endeavor. If you can describe your box in detail with instructions and illustrations on how to build it, then I may place it on my website.

    First check this instruction video and subscribe to my channel.

    How to make cannabis clone box closet

    1. Choose an adequate closet

    In reality, any closet or cabinet will work for germinating seeds or making clones. The major issue is the location of the cabinet. Do people commonly go into the area where the cabinet is? You have to think about security and the ability of anyone to spot it when you choose a location.

    My box is in my office cabinet, so I’ve got a lock on the metallic cabinet and the “rolling door.” I located this cabinet on an online auction and purchased it for about $20 (not too expensive).

    The size of the cabinet is 120x45x150 centimeter(lxbxh)

    How to make cannabis clone box install ventilation

    2. Provide plenty of ventilation

    CFL’s don’t produce that much heat especially by comparison to normal incandescent bulbs. So, the distance between the lamp and the plants can be relatively small. Still, a closet with 750 watts CFL’s can heat up over time. To combat this, I’m going to install a small exhaust fan that removes hot air from inside the closet and provides cooler, fresh air that’s CO2-rich from outside the closet.

    The plants need CO2 because it is instrumental for photosynthesis. The plant needs oxygen and sugars, and it gets those from the combination of light, water, and CO2. The mother plants and plants in the vegetative state are most in need of CO2-rich air.

    The scent of the marijuana plants can be noticeably pungent, so I’m attaching a small carbon filter to the fan, as well. The exhaust fan produces a vacuum in the closet, prohibiting air from escaping elsewhere. All the air that makes it out of the closet must go through the carbon filter, which kills the smell.

    Because heat rises, I’m going to create a hole at the top of the closet. This is where all the electrical wire will go also.

    How to make cannabis clone box install reflecting foil

    3. Hang reflective foil on the wall
    In order to make the most out of the light, having reflective material on the walls is a good idea. My personal preference is mylar foil because it reflects the light well and it also keeps the light from seeping out of the closet. You don’t have to do this, but it’s beneficial because the plants will get light from the side instead of just the top. This helps them grow faster. Aluminum foil and mirrors also work. Just ensure that you’re walls aren’t black!

    Note: To improve humidity, you can spray the reflective walls with water.

    How to make cannabis clone box divide

    4. Divide into 3 levels

    This closet needs one level for germination, one for seedlings and clones, and one for mother plants and plants in vegetative state.

    The top level should be for germinating seeds. Light isn’t important, but a consistent temperature helps. I install lights just for the heat (and also because I grow seedlings up there). There is about 10 inches between the shelf and the ceiling.

    The middle level is for rooting clones and growing seedlings. There is enough room to grow 300 clones on this shelf. Clones and seedlings require about 1 to 3 watts of light each. I’m planning to install four 60-watt CFL bulbs. There is 15 inches between the shelves.

    The bottom level is for mother plants and plants in vegetative state. They need the most space. I’m planning to install two 100-watt CFL bulbs with reflectors. There is 25 inches between the shelves.

    How to make cannabis clone box lights install

    5. Make holes in shelves to attach the light

    The smaller plants require an equal distribution of adequate light. It’s easiest to just mount the light to the shelf above, and adjust the difference as needed. Install the light in the center of the shelf and connect it there with a bolt and a nut.

    Once you’ve attached the lights to shelves, take the electrical cable outside of the closet through the air hole. It’s a bad idea to mix water and electricity in the same small room.

    How to make cannabis clone box camouglage

    6. Camouflage

    To avoid raising any suspicion, you should camouflage your set-up with a few normal items. Place some books or plants on top of it. Maybe a tablecloth or other decoration would also work. I am going to place some mail, invoices, and a small plant on top of my box so that it blends in with my office.

    How to make cannabis clone box

    7. That’s it

    This set-up will allow me to germinate about 200 seeds and create about 200 clones every week.

    Shopping list: 1 x closet – 6 x 60 watt cfl – 1 x 200 watt cfl met reflector – 14 x bold and nut – 1 x flange – 2 meter – ventilation hose – 1 x carbon filter – 1 x fan – Mylar foil

    Now that you know how easy it is to build one of these boxes, you should try it yourself. But first, you have to purchase some seeds. Check out our seedshop  for a wide selection of top-quality seeds. We ship to the United States, Canada, and number of other countries. If the order doesn’t get to you or the seeds don’t germinate, then you can get new seeds free of charge.


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    Robert Bergman

    Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. His passion for growing led him to develop his own Gold Leaf strain. Now, Robert is dedicated to sharing his knowledge with the world.... [Read full bio]


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