Cut 5-8 inches (10-20 cm) below cannabis growth tip. Many growers gently scrape or even split the bottom of the cutting so more “raw” insides get exposed. As you can see from the pictures below, the roots grow most easily from the parts of the stem that are raw, so scraping and splitting exposes more “insides,” which gives more surface areas for roots to grow out of and promotes faster rooting. Immediately put your new marijuana cutting in a glass of water! This will help prevent bubbles from getting in the stem!
Trim off any huge lower leaves or node points from the new cutting and clip the top fan leaves if they’re big. Clipping the leaves helps prevent the weed clone from “over-exerting” itself trying to turn light into food, when the plant should be focused on roots. You can take cannabis clones using just plain water, and your cuttings will make roots just sitting in the water that way. Some growers use rooting hormones and other cloning products to help the plant root faster. If you do plan to dip your cuttings, take your cuttings from the water and dip your newly scrapped cutting immediately into rooting hormone powder or gel to seal off air bubbles and give your cutting what it needs to start making roots. Some growers will use gel and then powder afterwards to get the best of both. Make sure you coat the entire bottom of the cutting, so that all the parts of the clone that get put into your starter cube is covered in gel. Place the new clone into a moistened starter cube, and press around the bottom to make sure everything is sealed and no air can get to the rooting area. If you have an automatic cloner or humidity dome, this is when you would place the new clone inside.
When you recreate the right conditions, you don’t need a cloner or humidity dome, yet these types of devices make successful cloning and root growth happen practically by itself. Yet if you follow the steps in this article, it’s not a matter of if your clones will take root, but just a matter of when. Almost 100% of clones will take root if you follow these instructions and just giver her enough time. In the next section I’ll explain exactly what your new clones need to thrive. Your clones need to get their water through their leaves right now because their roots haven’t formed. That’s why a nice humid cloner works great, or you can mist your plants a few times a day until they start forming roots. Some growers will use a heating pad under their clones to help keep things warm. A little warmer than room temperature 72-77 °F (22-25 °C ) is perfect. Some growers don’t use any grow lights at all for the first 1-2 days while clones get settled. Other growers do give light right from the beginning. It’s common to leave new clones in a warm, bright area for the first day or two, for example with a relatively weak grow light like a CFL bulb. Leave your grow lights on an 18/6 (Light/Dark) for your new clones. Don’t give new clones 24 hours of light, without any dark periods. Rooting seems to happen best when there’s some amount of darkness each day. The most important thing is to keep a close eye on your new clones until they’ve become well-established. Each clone will grow into a full sized marijuana plant! For the first 10 days and especially for the first 3-4 days, you don’t want to use full-strength light on your new clones. Clones want light from the beginning, but as they are focusing on making roots they don’t want a whole lot since they aren’t as strong as rooted plants! Cheap CFLs or other fluorescent grow lights like T5s are great cloning lights, as they’re not too intense. If you have just a small tent or cupboard to keep your clones, you can find CFLs at the grocery store, home improvement stores, even your local mini-mart! FLuorescent grow lights can be kept about 8-9″ above your clones. HID grow lights like Metal Halide and High-Pressure Sodium bulbs can work well for clones but need to be kept 2-3+ feet away from new clones so they don’t get scorched.
If you do start with intense lights, treat your cuttings like seedlings until your clones have formed strong roots. For example, a 400W HPS grow light is good about 30 inches away from the top of your clones while they’re rooting. If you’re growing in rockwool cubes or other starter cubes like Rapid Rooters, then you know your clones are ready to be transplanted and receive regular light when you actually see the roots coming out the bottom of the cubes. Remember, new clones are weak, and they should be treated gently like seedlings until they start growing vigorously. But within just a week or so, you will have fast-growing plants that are much bigger than any week-old seedling! And remember to be patient if it’s your first time. Almost every cutting will take root if you just wait long enough, and keep providing the right conditions. Some plants will root in just a few days, 7 days is average, but some clones can take 2 weeks (or even more) to start showing roots! 1.) Keep the leaves of each new clone gently moist – clones love misty conditions (especially the first week after taking a cutting) This is why many growers buy cloners, or a tray with a humidity dome (a clear plastic top to put over their plants), since they will keep your cuttings nice and moist for you and practically automate the whole process.
However, with a humidity dome, it’s extra important to keep an eye out for mold.