How to Clone Cannabis Plants Step by Step

Cloning is one of the most useful skills a cannabis grower can learn. Instead of starting from seed every time, cloning lets you take a cutting from a plant you already know performs well and grow an exact genetic copy of it.

What You Need

• A healthy mother plant in the vegetative stage
• A sharp razor blade or scalpel
• Rooting hormone (gel or powder)
• Rooting medium: rockwool cubes, peat pellets, or moist soil
• A humidity dome or clear plastic container
• A spray bottle with clean water
• Isopropyl alcohol for sterilizing your blade
• Low-intensity light (T5 fluorescent or dimmed LED)

Choosing the Right Mother Plant

The mother plant should be a strong performer: vigorous growth, good resistance to pests, and the cannabinoid/terpene profile you want.

It must be in the vegetative stage. A healthy mother can provide dozens of cuttings over its lifetime.

Step-by-Step Cloning Process

Step 1: Prepare Your Workspace

Wipe down your work surface with isopropyl alcohol. Sterilize your blade. If using rockwool cubes, soak them in pH-adjusted water (5.5 pH) for at least 30 minutes.

Step 2: Select and Cut the Branch

Choose a healthy branch from the lower or middle section of the mother plant.

The cutting should be 4 to 8 inches long with at least two or three nodes. Make the cut at a 45-degree angle about a quarter inch below a node. Use a clean, single stroke.

Step 3: Trim the Cutting

Remove the lower leaves, leaving only the top two or three sets. Cut off the tips of remaining leaves, removing about half of each leaf. This reduces moisture loss through transpiration.

Step 4: Apply Rooting Hormone

Dip the bottom inch of the cutting into rooting hormone gel or powder.

A thin, even coating is all you need.

Step 5: Plant the Cutting

Insert the hormone-coated end into your rooting medium. If using soil or coco, make a hole with a pencil first so you do not scrape off the hormone. The cutting should be stable and upright.

Step 6: Create a Humid Environment

Place the tray under a humidity dome. Maintain about 80 to 90% relative humidity. Mist the inside of the dome a few times a day. Open the dome briefly each day for fresh air exchange.

Step 7: Provide Gentle Light

T5 fluorescent or dimmed LED at 18 to 24 inches distance. Run lights on 18/6 schedule. Strong light stresses cuttings that have no roots.

Step 8: Wait and Watch

Roots typically appear in 7 to 14 days. A success rate of 75 to 90% is normal. Take more cuttings than you need to account for failures.

Step 9: Transplant

Once roots are visible and about an inch long, transplant into the final growing container. Handle gently. Give a few days of easy conditions to acclimate.

Troubleshooting

Cuttings wilting immediately: Normal for the first 24 to 48 hours. Increase misting and check dome humidity.

Stems turning brown or mushy: Stem rot from too much moisture. Reduce watering and increase ventilation.

No roots after two weeks: Check that rooting hormone has not expired, medium is staying moist, and temperatures are 72 to 78 degrees Fahrenheit.

Yellow leaves: Some lower yellowing is normal. If all leaves are yellowing, the cutting may be getting too much light or the medium may be too wet.

Key Takeaways

Cloning is straightforward once you do it a few times. Keep things clean, take cuttings from healthy plants, maintain high humidity, and be patient. Within two weeks, you will have rooted clones that are genetic copies of your best plants. Once comfortable with cloning, you will wonder why you ever relied solely on seeds.