To propagate basil from cuttings, snip a 3 to 6 inch stem tip that hasn’t flowered, strip the leaves from the bottom nodes and stand it in water or moist potting mix. Keep it warm and bright but out of harsh sun, and pot it up once its new roots stretch a couple of inches.
Picking a basil stem that will root
Choose a healthy, green shoot from the top of the plant with no flower buds. Stems that have started to flower put their energy into seeds, and they root slowly if at all. Soft, leafy growth roots fastest.
Make the cut right under a leaf node, the small bump where a pair of leaves joins the stem, since roots form most readily at nodes. The University of Vermont Extension suggests a cutting 3 to 6 inches long taken from the stem tip, which for basil usually means two or three sets of leaves. A supermarket bunch of fresh basil can work too if the stems are firm and not slimy. Put each cutting into water right after you take it so the cut end doesn’t dry out.
Rooting basil in a glass of water
- Pinch off the leaves from the lowest one or two nodes so no foliage sits underwater.
- Stand the cuttings in a clear glass or jar filled with room-temperature water, deep enough to cover the bare nodes.
- Set the glass in bright, indirect light, such as near a window that doesn’t get hot afternoon sun.
- Replace the water whenever it turns cloudy, rinsing the glass as you go.
- Watch for thin white roots at the submerged nodes. Timing varies with warmth and light, from days to a few weeks.
A narrow glass keeps the stems upright without leaves dipping in. Water rooting lets you see progress, which makes it the easiest method for a first try. Keep a few extra cuttings going, since one or two may fail.
Rooting basil in moist potting mix
Cuttings can also go directly into soil, which skips the transplant shock of moving from water to dirt. Fill a small pot with damp, fresh potting mix, poke a hole with a pencil and slide in the stripped stem so the lower nodes are buried. Press the mix snugly against the basil stem and water gently.
Basil cuttings lose water through their leaves before they have roots to replace it. Loosely drape a clear plastic bag over the pot, or set an upside-down jar on top, to keep humidity high, and vent it daily so condensation doesn’t cause rot. A gentle tug that meets resistance means roots have formed. Rooting hormone is optional; basil roots well without it.
Moving rooted basil cuttings into pots or the garden
When the roots are about two inches long, plant each cutting in its own pot of potting mix, keeping the soil lightly moist for the first week while it settles in. Give it a few days of shade before full sun.
Basil is tender to cold. The Clemson Cooperative Extension advises waiting to plant basil outside until daytime temperatures hold in the 70s and nights stay above 50°F. Cuttings rooted in late summer can live indoors on a sunny windowsill through fall. Once a potted cutting puts out new leaves at its tip, it has settled in and can be pinched back like any basil plant to encourage branching. Pinch off flower buds as they appear so the new plant keeps putting out leaves.
Why some basil cuttings wilt or rot
| Problem | Likely cause | Fix |
|---|---|---|
| Stem turns black and mushy at the waterline | Stale water or leaves left submerged | Trim above the rot, remove lower leaves, change water more often |
| Cutting wilts on day one | Too much direct sun or heat | Move to bright shade; mist or cover in soil |
| No roots after several weeks | Flowering stem or cold spot | Retake cuttings from leafy tips and keep them warm |
| Rooted cutting collapses after potting | Transplant shock or soggy mix | Shade for a few days and water only when the top feels dry |
Frequently asked questions
Can basil grow in water forever?
Basil can survive in water for a while, but it grows weaker without the nutrients and support of soil. Leaves get smaller and stems get leggy. For a plant that keeps producing, move rooted cuttings into potting mix once the roots are a couple of inches long.
Can you root basil from grocery store bunches?
Often, yes. Pick bunches with firm green stems and no black spots, then treat each stem like a garden cutting by trimming below a node and stripping the lower leaves. Stems that were stored very cold or have started to wilt root less reliably, so start several.
When is the best time to take basil cuttings?
Take cuttings during the warm growing season, when the plant is putting out plenty of soft new growth and before it goes to flower. Late summer cuttings are a common way to carry basil indoors, since the parent plant won't survive frost outside.
How do you grow Thai basil from cuttings?
The same way as sweet basil. NC State Extension lists Thai basil under the same species, Ocimum basilicum, and names seed and stem cuttings as the ways to propagate it. Take a soft 3 to 6 inch tip without flower buds, strip the lower leaves and root it in water or moist potting mix.
How do you propagate basil from its flowers?
You can't root the flowers themselves, and stems that have started flowering root slowly if at all. Pinch off the buds and take leafy tips for cuttings instead. To use the flowers, let a few dry on the plant, collect the seeds they form and sow them, since NC State Extension lists seed as a way to propagate basil.
