How to Clone Plants Indoors

To clone a plant indoors, take a 4- to 6-inch stem cutting just below a node on a healthy parent plant, strip the lower leaves, apply rooting gel to the cut end, and insert it into a pre-moistened rooting cube under a humidity dome. Most herbs, vegetables, and tropical houseplants root in 7 to 14 days at 72 to 78°F.

What is plant cloning — and how does it differ from seed propagation?

Plant cloning is vegetative propagation: taking a piece of a living plant and rooting it so it grows into a new, genetically identical plant. Every clone carries the exact genetics of the parent — the same growth rate, flavor, yield, or appearance that made the parent worth duplicating. This is fundamentally different from growing from seed, where each seedling carries a genetic mix from two parent plants and can vary significantly in its characteristics.

For practical indoor gardening purposes, cloning means taking a stem cutting, applying rooting hormone, and providing the right environment for the cutting to grow roots before it runs out of stored energy. The technique is the same whether you are cloning a productive basil variety, a high-yielding tomato plant, or a rare houseplant specimen you want to multiply without buying another.

Which plants can be cloned indoors?

Most soft-stemmed plants that are actively growing clone well from stem cuttings:

Herbs: basil, mint, rosemary, thyme, sage, oregano, lemon balm, and tarragon all clone reliably. Mint and basil root in water in under a week and require no rooting hormone.

Vegetables: tomatoes, peppers, cucumbers, and eggplant clone well and produce earlier harvests than seedlings because the clone carries the mature growth stage of the parent plant.

Houseplants: pothos, heartleaf philodendron, tradescantia, coleus, begonia, impatiens, and fuchsia are among the easiest cloners. Most root in a glass of water with no additional products.

Fruiting plants: strawberry runners root without any additional hormone; blackberries and blueberries clone from semi-hardwood stem cuttings taken in late summer.

Succulents, cacti, and most bulb plants do not clone efficiently from stem cuttings. Use leaf cuttings for succulents and African violets, and division for clumping plants like peace lily and calathea.

What equipment do you need to clone plants indoors?

Essential:

• Sharp, sterile scissors or pruning snips
• Rooting gel (Clonex or equivalent)
• Rooting medium: Rapid Rooter plugs, rockwool cubes, or perlite
• Humidity dome or clear propagation enclosure
• Grow light or bright indirect natural light

Optional but significantly increases success rate:

• Heat mat set to 72 to 78°F placed under the rooting tray
• Aeroponic cloner machine for high-volume propagation
• pH test kit if using rockwool cubes (pre-soak in water adjusted to pH 5.5 to 6.0)

You do not need expensive equipment to clone most houseplants and herbs. A clean pair of scissors, a jar of rooting gel, a bag of Rapid Rooter plugs, and a humidity dome is a complete cloning setup for under $40.

How to take a cutting for cloning (step-by-step)

Step 1: Choose a healthy parent plant in vegetative growth

Select a parent plant that is actively growing, showing healthy green foliage, and showing no signs of stress, disease, or pest damage. Avoid taking cuttings from plants that are flowering — flowering plants redirect energy toward reproduction and produce roots slowly or not at all from cuttings. If a plant has begun to flower, you can still take cuttings from the lower vegetative stems that have not yet transitioned.

Step 2: Identify the right stem section

Look for a stem that is 4 to 6 inches long with at least two to three nodes. A node is the slightly swollen joint on the stem where a leaf attaches. Roots emerge from nodes — a stem section with no node cannot produce roots regardless of rooting hormone or conditions. The ideal clone stem is firm and green, with two to three healthy leaf pairs and no signs of yellowing or softness.

Step 3: Sterilize your cutting tool

Wipe scissors or pruning snips with 70 percent isopropyl alcohol before each cut. Bacteria introduced at the cut end is one of the most common causes of clone failure. A contaminated tool can transmit disease from one plant to another and introduce rot-causing microbes directly into the cut surface at the most vulnerable moment.

Step 4: Make a 45-degree cut just below a node

Hold the scissors at a 45-degree angle and cut cleanly about a quarter inch below the lowest node you plan to bury in the rooting medium. The angled cut maximizes the surface area exposed to rooting hormone and prevents the cut end from sitting flat against the bottom of a rooting cube, which would block drainage and limit oxygen around the cut surface.

Step 5: Place the cutting in water immediately

The moment the stem is cut, air enters the water-conducting vessels and begins forming a blockage that slows water uptake. Placing the cutting in a glass of room-temperature water within 30 seconds prevents this. Keep all cuttings in water while you prepare the remaining steps — this is especially important in warm, dry rooms where the stem can begin to seal within minutes.

Step 6: Strip all leaves from the lower two-thirds

Leave two to three healthy leaves at the top of the cutting. Remove every leaf that would end up below the surface of the rooting medium. Buried or submerged leaves rot quickly and introduce bacteria directly into the rooting zone. For large-leaved plants like tomatoes and peppers, trim the remaining top leaves in half to reduce moisture loss through transpiration while the cutting has no roots to compensate.

Step 7: Apply rooting gel and insert into the rooting medium

Pre-moisten your Rapid Rooter plugs or rockwool cubes with room-temperature water. Take the cutting from the water, dip the cut end a quarter inch into rooting gel, rotate to coat evenly, then insert immediately into the pre-moistened rooting medium so the lowest node is buried and anchored. Do not wipe off the gel. The coating continues supplying rooting hormone to the node throughout the entire 7 to 14 day rooting period.

Step 8: Place under a humidity dome and maintain high humidity

Set the rooting tray under a humidity dome and mist the interior walls with water before closing. Adjust the dome vents to keep interior humidity above 80 percent. Position the setup under a T5 or LED grow light set to 16 hours on and 8 hours off at low to medium intensity — about 24 to 36 inches above the cuttings. If using a heat mat, set it to 72 to 78°F for optimal root initiation in most herbs and vegetables.

Mist the cuttings (not the rooting medium) twice daily. The plugs or cubes should stay moist but never dripping — excess water drives out oxygen and causes stem rot at the cut end. Lift the dome briefly once per day to exchange air and prevent mold buildup on the surfaces.

How to root clones: three methods compared

Rooting cubes in a humidity dome remain the most reliable all-purpose method for indoor cloning. Rapid Rooter plugs — made from composted organic bark — hold the cutting upright, maintain the right moisture balance, and transplant directly into potting soil or hydroponic net cups with zero disturbance to the developing roots. Rockwool cubes offer similar benefits but require pH-adjusted water at 5.5 to 6.0 to neutralize alkaline residue from manufacturing before use.

Water propagation requires the fewest supplies and works well for easy-cloning plants like basil, pothos, and tradescantia. Change the water every three to five days to prevent bacterial buildup. Transfer to soil or growing medium once roots reach one to two inches — water roots are structurally different from soil roots and adapt poorly if left in water once they exceed three inches in length.

Aeroponic cloners suspend the cut ends of cuttings above a reservoir of plain water and continuously mist them with fine, oxygen-rich droplets delivered by a submersible pump and spray manifold. This constant aeration around the cut end dramatically accelerates root development — most cuttings that take two weeks in a dome root in five to seven days in an aeroponic cloner. These machines hold 16 to 200 cuttings at a time and are the preferred tool for growers who clone regularly and in volume.

Rooting hormone for cloning: gel, powder, or liquid?

All rooting hormones contain indole-3-butyric acid (IBA), which signals cut stem tissue to begin root formation. The format determines how well the hormone stays in contact with the cut end throughout the rooting period — a detail that matters far more in cloning than in casual propagation.

Gel is the best choice for indoor cloning. Products like Clonex coat the moist cut surface completely and do not wash off when cuttings are misted or when aeroponic spray hits the stem. The gel also helps seal the cut end against pathogens in the critical first 24 to 48 hours when bacterial contamination most often takes hold.

Powder performs well for dry soil propagation but is less reliable in the high-humidity conditions of a cloning dome, where it flakes off the cut surface quickly. It is a reasonable substitute for easy-rooting species if gel is unavailable, but should not be your first choice.

Liquid concentrate is used commercially for batch quick-dip application but requires precise dilution and is overkill for most home cloning setups.

Use rooting gel for all indoor cloning applications: dip a quarter inch of the cut end into the gel, rotate to coat evenly, and insert immediately without wiping. A 100ml bottle of Clonex treats well over 100 cuttings and remains effective for two or more years when sealed between uses.

Tools that make indoor cloning easier

Common indoor cloning mistakes to avoid

Cutting between nodes instead of below one: The most common beginner error. A stem section with no node cannot produce roots — there is no tissue capable of root formation. Always identify the node first, then position the cut a quarter inch below it.

Too many leaves left on the cutting: Each leaf transpires moisture. A clone with five or six large leaves loses water faster than a rootless stem can absorb, causing the cutting to wilt and collapse before roots form. Strip all but two to three small leaves.

Skipping the humidity dome: Without high ambient humidity (80 percent or above), unrooted cuttings desiccate and die within hours in a typical heated or air-conditioned home. The humidity dome is not optional for most cloning setups.

Overwatering the rooting medium: Rooting cubes and plugs should be moist — wet enough to hold their shape when squeezed, not dripping wet. Excess water fills the air pockets in the medium, deprives the cut end of oxygen, and causes stem rot within days of insertion.

Using contaminated or dull tools: A dirty cutting tool introduces bacteria directly to the most vulnerable surface on the plant. A dull tool crushes and frays stem tissue at the cut, which slows root development significantly. Sterilize tools before each use and keep blades sharp.

Moving cuttings to check for roots: Pulling or wiggling a cutting to see if it has rooted breaks any new roots that have started to form and can set the process back by a full week. Wait at least seven days, then test by pressing gently against the base of the plug — resistance indicates anchored roots.

FAQ

Bottom line

Cloning plants indoors is one of the most practical skills in indoor gardening: it costs next to nothing beyond a few supplies, produces plants with the exact genetics of your best performers, and gives you a continuous supply of starts without buying new seeds each season. Start with a humidity dome, Rapid Rooter plugs, and a jar of Clonex gel — this setup works for most herbs, vegetables, and houseplants at minimal cost. If you clone frequently or in volume, an aeroponic cloner like the Clone King pays for itself quickly in the time saved and the higher success rates it delivers.

For related reading: how to propagate houseplants, how to grow herbs indoors, how to start seeds indoors, and how to set up a grow tent.