Cloning tomato plants means growing new plants from stem cuttings of an existing plant, not from seed

A clone is a genetic copy of the parent plant. When you take a cutting from a tomato plant and root it, the new plant will be identical to the original — same flavor, same yield, same disease resistance. This is different from growing from seed, where traits can vary. Cloning is useful if you have a tomato variety that performs well in your garden and you want to replicate it exactly, or if you want to extend the growing season by starting new plants from an existing one late in summer.

The process takes three to four weeks from cutting to a rooted plant ready to pot up. Success rates are high — most cuttings will root if you follow the basic steps. You do not need special equipment; a glass of water, a pot of soil, or a propagation tray all work.

Key Takeaways

  • Take cuttings from the soft, green growth at the branch tips, not from woody stems, and cut just below a leaf node where roots will form.
  • Remove the lower leaves so they do not sit in water or soil, then place the cutting in water or moist soil to root.
  • Rooting takes two to four weeks; you will see white root tips emerging from the base before the cutting is ready to pot.
  • Water-rooted cuttings can go directly into soil once roots are half an inch long, but soil-rooted cuttings skip this step.
  • Cloned plants are ready to transplant outdoors at the same size as seedlings, usually six to eight weeks after the cutting was taken.

Choose the right stem and make the cut

Select a healthy branch with soft, green growth at the tip. Avoid woody, brown stems or branches that look diseased or stressed. The best cuttings come from the upper part of the plant where growth is vigorous. A cutting should be four to six inches long — long enough to have at least two or three leaf nodes (the bumps where leaves attach) but short enough to root quickly.

Use a clean knife or pruners and cut just below a leaf node at a 45-degree angle. The node is where roots will emerge, so cutting below it gives the cutting the best chance. If you are taking multiple cuttings, do this in the early morning when the plant is fully hydrated; cuttings taken in heat or late afternoon are more likely to wilt before they root.

Prepare the cutting for rooting

Remove all leaves from the lower half of the cutting. These leaves would sit in water or soil and rot, which invites disease and wastes the plant's energy. Leave the top two or three leaves intact — the cutting needs them to photosynthesize and power root growth. If the remaining leaves are very large, you can cut them in half to reduce water loss while the cutting is rooting.

Some growers dip the cut end in rooting hormone powder before placing it in water or soil. Rooting hormone contains auxins that speed root formation and improve success rates, but it is not required — tomato cuttings root readily without it. If you use it, follow the package directions and tap off excess powder so it does not clump.

Root the cutting in water

Place the cutting in a glass or jar of room-temperature water, making sure the lowest leaf node is submerged. Change the water every two to three days to prevent bacterial growth and keep oxygen levels high. Set the glass in bright, indirect light — a windowsill works well, but direct afternoon sun can heat the water and stress the cutting.

Roots will begin to form within one to two weeks. You will see white root tips emerging from the base of the stem. Once roots are at least half an inch long, the cutting is ready to pot. Do not wait until roots are long and tangled; they are more fragile and harder to plant without breaking.

Root the cutting in soil

If you prefer to root directly in soil, fill a small pot or seed tray with moist potting mix. Make a hole with your finger or a pencil, insert the cutting so the lowest leaf node is buried in soil, and gently firm the soil around it. Water lightly so the soil is moist but not waterlogged.

Cover the pot with a clear plastic bag or dome to hold humidity while roots form. Place it in bright, indirect light and keep the soil moist — not soggy — by misting or watering lightly every few days. After two to three weeks, gently tug the cutting; if you feel resistance, roots have formed and you can remove the cover. Once roots are visible through the drainage holes or the cutting is clearly growing, it is ready to move to a larger pot if needed.

Transition rooted cuttings to soil and containers

Water-rooted cuttings can go directly into potting mix once roots are half an inch long. Fill a small pot with moist soil, make a hole, and plant the cutting so the roots are covered and the lowest leaves are just above the soil surface. Water gently and place the pot in bright light. The cutting may wilt slightly for a day or two as it adjusts; this is normal.

Soil-rooted cuttings are already in their growing medium, so you only need to remove the plastic cover and move them to brighter light. Once they are growing steadily and the pot is full of roots, move them to a larger container — usually a four-inch or six-inch pot — filled with potting mix. Handle the root ball carefully to avoid breaking roots.

Care for young cloned plants until they are ready to plant outside

Keep rooted cuttings in bright light — a south-facing window or grow light works well. Water when the top of the soil feels dry to the touch. Fertilize lightly once a week with a balanced, diluted fertilizer once the cutting has been in soil for three weeks and is growing new leaves. Too much fertilizer will burn young roots, so use half the recommended strength.

Harden off the plants before moving them outdoors by gradually exposing them to outdoor conditions over seven to ten days. Start with an hour in a sheltered spot, then increase time and sun exposure each day. This prevents sunburn and wilting when the plants transition to the garden. Plant them outside after the last frost date, at the same depth they were growing in the pot, just as you would with seedlings.

Frequently Asked Questions

Can I clone a tomato plant that is already flowering or fruiting?

Yes, but cuttings from flowering or fruiting branches root more slowly than cuttings from vegetative growth. If possible, take cuttings from non-flowering branches. If the whole plant is flowering, cuttings will still root — just expect it to take a week or two longer.

What if my cutting wilts after I plant it?

Wilting is common for the first day or two after planting a water-rooted cutting in soil. The roots are adjusting to the change in moisture. Mist the leaves lightly and keep the soil moist but not waterlogged. If wilting persists beyond three days, move the pot to less direct light and check that the soil drains well.

How many cuttings should I take from one plant?

You can take several cuttings from a healthy plant without harming it. Removing branch tips actually encourages bushier growth. Take no more than one-third of the plant's foliage at once, and space cuttings out over time if you need many clones.

Can I clone a tomato plant indoors over winter?

Yes. Take cuttings in late summer or early fall, root them indoors under grow lights, and keep them as small plants through winter. They will grow slowly in low light but will be ready to plant outside in spring. This is a good way to preserve a favorite variety and get a head start on the season.

Do cloned tomato plants produce the same yield as the original?

Yes, cloned plants are genetically identical, so they should produce the same quantity and quality of fruit as the parent plant, assuming they get the same growing conditions and care.