Here’s a concise and informative guide on how to cut marijuana clones for rockwool, peat pellets, and similar rooting media. The prerequisite is a mother plant with sufficiently large shoots that can be cut completely or above a leaf pair. Furthermore, preparations should be made. First, water with an EC value of around 0.5 to 1 EC and a pH value of around 5.6 should be prepared and left to stand overnight. This allows it to reach room temperature and any chlorine to gas off. Tap water will often suffice. If it’s too hard or contains too many salts, it can be mixed with rainwater or distilled water. Distilled water alone would probably be unsuitable, as there should be some salts in the water. But only a few.
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The Quality of the Clone Determines the Quality of the Plant
Furthermore, you should have scissors, a very sharp blade like a scalpel or razor blade, and optionally a rooting hormone ready. You’ll also need rockwool or other cubes. If peat pellets are chosen, you should know that these retain waterlogging. These should be lightly squeezed after soaking and not drowned when watering later.
Now you just need a small greenhouse with lighting and temperature control. Extremely important is a temperature of around 20 to 24° Celsius. This must not be significantly colder and should never exceed 26° Celsius. Then bacteria seem to form that decompose the stem. You can’t see this until the cutting simply tips over. You can cut off the spot and try to reinsert it. But the original rockwool block should be disposed of because of the bacteria. (This is also how you can rejuvenate leftover marijuana clones by cutting them off and letting them root again.)
First about 80%, then 70%, and finally 60% humidity should be achieved before transplanting. Then the young plants won’t wilt when they’re suddenly in dry air, since it’s only slightly drier. Therefore, a dome on the greenhouse or a humidifier would be good at first. However, the problem arises that droplets form on the plants at high humidity. If these are on the growing tips, some mold can form here, which destroys the respective growing tip. Therefore, you must not let it get too humid and should occasionally ventilate the dome.
How Do I Cut Marijuana Clones?
Here’s the fast version: Cut appropriately long marijuana clones or longer shoots from the mother plant with scissors and place them in a water glass. You can cut 50 shoots into one glass. Now go to the work table. If the leaves are large, they can be trimmed in half with scissors. The clone stem must always be cut at an angle of about 45° when cutting marijuana clones. This is now done with the sharp blade, cutting it directly to the appropriate length. The scissor cut has clogged the pores, so the final cut must be made with a sharp blade. If the rockwool block is very firm, you can pre-drill with a toothpick first.
The clone stem can now be treated with a rooting hormone. These rooting hormones are used quite differently. The manufacturers describe the correct use for each. There are, for example, hormone powders, but the cut site must be free. You stick the only slightly moist stem into the powder, tap it off, and only then cut diagonally to length. Then there are rooting gels, in which the cutting is dipped one to two cm or only a strip on the edge may be provided with gel. Rooting gel may usually only be used fresh; the portion removed for work must be disposed of afterwards.
Then the cutting is placed in its rooting medium and pressed firmly from the side with a stick, which is very important with rockwool. There are also rockwool blocks from individual manufacturers where one is airy and the other is more compact. This is bad because the airy ones need to be soaked more quickly, but waterlogging can occur in the compact ones. This is counterproductive, but you can sort everything and soak separately as needed. The mother plants can be pruned healthy to be able to cut marijuana clones again after 2 to 3 weeks.
Rooting Marijuana Clones
In cold conditions, a heated floor mat in the greenhouse can help a lot, but the marijuana clones in the middle dry out first. Therefore, some moisture should simply remain on the floor, which gradually evaporates. However, the clone roots must never stand in this puddle, as they would be damaged. You should also regularly check the dryness of the rooting media without a heating mat, not just at the edges. If it gets too warm, you can heat for 15 minutes out of every 15, 30, or 45 minutes with the timer. It should stay above 20° but below 24° Celsius. It should be illuminated for at least 18 hours a day. The light shouldn’t be too strong. Normal 18 or 36-watt plant light fluorescent tubes or comparable lights with about 100 watts per square meter are sufficient; more is not better. Too much light causes strong photosynthesis and the plant works above ground. However, it should root and therefore receive only moderately bright light during this time. Plants are also placed outside during cloudy, rainy weather for the same reason.
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Against too high humidity, the vapor cover can be offset; with too low humidity, a humidifier can blow directly onto the greenhouse. Foliar feeding is not necessary; there should be no fertilization. Other water additives are not necessary as long as the water has about 0.5 to 1 EC and about 5.6 pH.
Individual varieties root in 7 days, others need three weeks. However, it’s normal for some marijuana clones of the same variety to root faster and some slower. You should sort the clones so that you soak the water drinkers more often to avoid the slowing to deadly waterlogging in the others. Soaking is really the easiest way to water; peat pellets should be lightly squeezed afterwards.
Well-rooted and already growing marijuana clones should be transplanted. The roots should not be kinked. The root tips should never stand in water, even after potting. When transplanting, some roots should definitely be visible. Only vital and well-rooted clones will be able to grow into vital plants. Other marijuana clones usually remain significantly behind or die. Even after potting, young plants without fibrous or woody roots will die at temperatures over 26° Celsius. Older plants will be slowed in their performance if these temperatures are reached at the roots. At least when growing on coir and similar substrates. Even in aeroponic systems, water temperatures that are too high are harmful or even very quickly deadly!
If you cut the shoot directly on the mother plant diagonally with the sharp knife, you should also insert it directly. You can still temporarily store the marijuana clones in the water glass, but you have to work more carefully and quickly.
