Cloning cannabis from mother plants, in short
You cut a 4 to 6 inch branch off a healthy female plant you keep in vegetative growth, trim away the lower leaves, dip the cut end in rooting hormone, and park it in a warm, humid spot until roots push out. Most cuttings root in 7 to 14 days, and each one is a genetic copy of the mother. The mother stays under 18 hours of light or more, never flowers, and keeps handing you cuts for months.
That is the whole idea. Everything below is the detail that decides whether you get 90 percent success or 20 percent.
Why keep a mother instead of popping seeds
Seeds are a lottery. Even from good breeders, each plant can lean a little different in structure, finish time, and effect. A mother plant locks in the plant you already liked. Same stretch, same yield curve, same smell, same eight week finish. No males, no surprise hermaphrodites halfway through flower.
The tradeoff is space. A mother needs her own corner, her own light, and weekly attention. If you run four plants or fewer in a small tent, you may be better off cloning right before you flip to flower and skipping a dedicated mother room.
Choosing and keeping the mother
- Start from a plant you have already grown out and enjoyed. Cloning a mystery plant just multiplies the mystery.
- Confirm it is female and has never thrown male flowers under stress.
- Keep her in veg at 18 hours on, 6 off. Long days keep her from flowering.
- Feed moderately. Pushing nitrogen hard gives you soft, watery cuts that rot in the plug.
- Prune the top to keep her bushy and low. Take cuttings from middle and lower branches, not the woody base.
- Replace the mother every 6 to 12 months with one of her own clones. Older mothers get woody, slow down, and can accumulate viruses and pests.
What you actually need
- Sharp, sterile scissors or a scalpel
- Rooting hormone, gel or powder with IBA or NAA
- A propagation tray with a clear dome
- Rockwool cubes, peat plugs, or coco plugs
- pH water around 5.5 to 6.0 for plugs
- A weak veg light, 6500K, kept a foot or two away
- A heat mat if your room runs under 70F
- Labels, because every tray looks the same by day three
Step by step
- Wipe your blade with alcohol. Dirty tools are the number one cause of stem rot.
- Pick a healthy branch with two or three nodes and cut it 4 to 6 inches long.
- Make the final cut at a 45 degree angle just below a node. Roots form fastest there.
- Strip the bottom leaves and any growth that would sit inside the plug. Leave two or three leaves at the top. If they are huge, snip the tips in half to cut water loss.
- Dip the cut end about half an inch into rooting hormone. Tap off the excess powder.
- Push it into a pre soaked plug. Do not jam it through the bottom.
- Set plugs in the tray, cover with the dome, and leave the vents mostly closed for the first three days.
- Run the light 18 hours on. Low intensity only. Cuttings have no roots to drink with, so strong light cooks them.
The environment that decides your success rate
Temperature and moisture matter more than anything else you do. Aim for 72 to 78F. If the room is cold, a heat mat under the tray helps, because warm roots beat warm air every time.
Humidity should sit near 80 to 90 percent for the first few days. After that, crack the vents a little each day so the plants start learning to pull water on their own. By the time you see roots, the dome should be mostly open.
Keep the plugs damp, not soaked. Squeeze one. If water runs out, it is too wet. No nutrients for the first week or so. Plain pH water is fine. Once roots show, start a quarter strength veg feed.
Reading the signs
- Stems flopping over: too wet, too cold, or both.
- Lower leaves yellowing in the first week: normal. Heavy yellowing across the plant means too much light.
- No roots at day 14: usually temperature. Check the plug warmth before you change anything else.
- Roots at the edge of the plug, 1 to 2 inches long: transplant time. Move them into a small pot, not straight into the final container.
Mistakes I see most
Taking cuttings from a plant already in flower tops the list. It works, but the cutting has to revegetate first, which adds two to four weeks and produces weird single blade leaves for a while. Do not clone a plant that has pests, mildew, or a virus. You are copying the problem.
Other common ones: letting plugs dry out completely, running a strong light on unrooted cuts, forgetting to label, and cloning from the top cola branch instead of the flexible middle growth. Check your state and local rules before you grow. Plant counts and home cultivation limits vary, and a mother plant usually counts toward your total.