How I make a Cannabis clone in a cup of water.

by Alex Robles

What’s happening my fellow cultivators, I hope everyone celebrated the New Year safely medicated.  Today I’m going to talk about cloning, more specifically one of the techniques that I use to do this.  There are a lot of different ways to make a clone using lots of different methods and equipment, the trick is finding the way that works for you.

I don’t clone very often and when I do I rarely use more than 10 cuts.  Plus my cloning style is a very sit-and-wait, passive way with a 70% success rate.  When I say “passive” I mean I don’t use a lot of equipment that has to be maintained like a “bubble cloner”.  I have used/built them in the past and have had great results with them.  That’s because when it’s done right they give fast, consistently beautiful looking roots with almost 100% success.  But to me, more equipment means I have to find some place to put it and I have to give more of my time to make sure it’s working the way it should.  I don’t want to do either one of those things so I found the simplest ways that works for me.  Right now I’m going to cover the “cup of water” technique that I use, but first we have to cut a clone.

Cutting and preparing the Clone


  • Scissors (disinfected with alcohol)
  • A clear cups with water (pH 5.5 -6.5)
  • Rooting solution (Rootech gel)

When I take a cut for a clone I start with a sterile pair of scissors and a female plant that’s in the vegetative stage. I’ll choose a healthy branch that has at least three sets of leaves (counting from the top down) to cut.  I like to use a limb that’s 6 to 8 inches long because when I’m done I want that clone to be taller than the cup I’m putting her in.  I’ll cut  the limb at a 45 degree angle because this make a larger surface area than a straight cut.  More surface area means more space for root growth.  Then I’ll remove all of the lower leaves, leaving only the top two sets and I’ll cut the tips off the remaining leaves for a couple of reasons. First, those tips are going to go necrotic (die) anyway, I don’t need dead tissue on my plant.  Second, it signals to the cut to focus its energy on making roots and not on making leaves.  Then I’ll take my scissors and gently scrape the outer layer off the bottom ½ inch of the cut to expose fresh tissue, which increases the area that the new roots can easily grow from.  The last thing I do is put the cuts in the rooting gel for about five minutes, after that they’re ready to be put in rockwool or water.

Cup of Water

I put 3 to 4 cuts in a clear cup with pH balanced water and a small fan near them in a room or cabinet that won’t get colder than 60 degrees F.  The fan helps with airflow/exchange, plants don’t thrive with stale air.  Colder temps slow down plant processes and that includes root growth, 75-80 degrees is perfect.  I don’t use a “clone dome” because if my temps are under control I won’t worry about the humidity.  I’ll keep them under a 2ft T5 fluorescent light that will be about 8-10 inches away from the top of the of the clones and change the water every two days.  In about 2-3 weeks I’ll start to see root growth and I’ll transplant them a week later.

Growers Note: You can make a clone from a flowering plant but you have to make sure to remove all of the flower from the cut so it uses all of its resources to make roots.  It’s also going to need a few extra weeks to go from the flowering stage back to veg, and it’s going to throw out some weird leaves while it does this.

Well there you go folks that’s how i clone in a cup of water, I hope it helps.  Next time I’ll tell you how I clone in rockwool, it’s similar to this but a little different.

Leave a question or a comment.

Don’t forget to check out the podcast “In My Grow Show” (Click here to link and listen)

Grow, Learn, Teach

Click here for Rootech cloning gel

Click here for Bubble cloner

Click here for Clone dome

Click here for T5 Grow Light

Click here Small fan

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