Give strong light to your plant so all the newly-exposed shoots grow quickly But not too much light. Make sure to follow the manufacturer’s instructions on how far to keep your grow light from plants. Keeping a grow light too close to the plant can slow down plant growth to a crawl.
Make sure to deal with any problems so your plant grows as fast as possible If you follow these instructions, it should only be a week or two before you have several suitable clone sites. I’ve seen some growers take 12″ (30 cm) clones or even bigger, especially when using an aerocloner. Big clones can root in the right environment and one advantage is the plants are already well developed. If you’ve got long branches and want a bunch of tall plants right away, you can often turn those branches into big clones. However, bigger clones can be more likely to wilt immediately because they have a difficult time getting water to their tallest leaves and branches. The other issue with big clones is they already have a set stem structure. With smaller clones, you have the ability to shape the size and shape of the clone via plant training, which can dramatically increase your overall yields indoors under a grow light. Step 2 – Trim the branches until there are only the top two pairs of leaves. You’re cleaning up the stems so you don’t have leaves sitting underwater in the glass.
It’s easier to clean the sides of the stem now than after the clones have already been cut. Trim the branches in preparation so they’re mostly smooth. I typically leave the top two pairs of fully formed leaves, but each clone is a little different. Step 3 – Cut off your clone and immediately put in water. Don’t forget to label your cups with the name of the strain because it’s easy to forget which is which. Try to cut at a 45-degree angle, and make your cut near a node/set of leaves if possible (this may help clones root faster) Immediately place your new cuttings in water. The longer you wait after cutting before putting the stem in the water, the more likely air will get in the stem. Air in the stem causes the clone to immediately droop and start dying. That’s why the new cutting must be put in water immediately (just like when cutting flowers or roses for a vase). Note: If using cloning gel or powdery, quickly dip the end of the stem first then place in water. Some growers dip in gel first, then powder, then into the water. Some growers trim the edges of their leaves, especially big leaves. This is because the cutting has trouble getting enough water to the leaves without any roots. That’s why it’s also a good idea to trim leaves if it’s very dry where you live (the leaves evaporate water quickly in dry air, and the plant can’t keep up). It can also help to raise the humidity or use a dome to keep more moisture in the air around clones. Trim the ends of leaves if they’re big, or if the air is dry (under 30% RH) where you live. Step 3 – Place new cuttings in a warm bright spot to make roots. I have a sunny window that gets really warm, and that’s where I like to put the new cuttings. For the first two days, I leave the blinds mostly closed so they’re getting filtered light. After two days I’ll open the blinds and the window so they’re getting direct sunlight for part of the day. Give filtered light for 2 days at first so they have time to adjust Then move cuttings to a bright spot with direct-but-not-intense light (for example in a sunny window or under a fluorescent grow light) If you notice the water level getting low, gently top off with plain water by pouring water down the sides of the inside of the cup. Some growers change the water every day when cloning in a cup to help oxygenate the water, but I personally don’t do that and I’ve never had a problem getting roots to form. This sunny window is my favorite spot for cup cloning. I angled the blinds so these newly-cut clones get filtered light for a few days before getting full sun. If you’ve followed all the directions here, your cuttings should stay upright and healthy-looking the whole time. After about 2 weeks you may start seeing roots on some plants.
It’s normal if you notice the bottom of your stems turn brown. I had an Ocean Fruit plant where every single cutting rooted within 10-12 days. That plant apparently loves being cloned via this method. However, certain plants/strains are just harder to clone than others. I had a Durban Poison plant that took 4 weeks before its cuttings started making roots. All the other plants had rooted all their clones before the first Durban Poison clone made roots. So if your clones are taking a long time to root, it may have nothing to do with you. Most plants will have roots within 2-3 weeks, however, it’s normal for some cuttings to take longer than others even from the same plant. You may have some cuttings show roots at week 2, while others from the same plant show their first roots in week 4.
I personally like taking many more clones than needed so I can keep the ones that root first. Those tend to be the fastest-growing plants anyway! I completely forgot about these and when I checked on them the roots were grown together and almost all the water was gone!