How to Grow Basil From Cuttings in a Glass of Water

If you want to grow basil from cuttings in water, you’ve stumbled onto one of the most satisfying, low-effort gardening tricks around. No bags of compost, no seed packets, no waiting weeks for germination — just a healthy stem, a glass of tap water, and a sunny windowsill. Whether you’re rescuing a supermarket basil plant that’s on its last legs or multiplying a prize variety from your garden, this method works reliably well, and the results arrive surprisingly fast. This guide walks you through every stage, from snipping the perfect cutting right through to transplanting a thriving, root-heavy plant.

What You’ll Need

• A healthy basil plant (shop-bought or garden-grown) with stems at least 10 cm / 4 inches long
• Clean, sharp scissors or pruning snips
• A small, clear glass or jar (clear glass lets you watch the roots develop)
• Room-temperature tap water or filtered water
• A bright windowsill or spot that gets 6+ hours of indirect light per day
• Optional: a small bottle of liquid seaweed fertiliser for a rooting boost
• Potting mix and a small pot for transplanting once roots appear

Step 1: Choose the Right Stem to Cut

The single most important decision when you grow basil from cuttings in water is picking the right stem. Look for a non-flowering stem — one with plenty of green, healthy leaves and no yellowing or wilting. Flowering stems divert energy into seed production rather than root growth, so avoid them or pinch off any flower buds before taking your cutting.

Aim for a stem that’s roughly 10–15 cm (4–6 inches) long. It should feel firm, not limp, and the colour should be a vivid, deep green. Pale, leggy, or mushy stems rarely root well and can rot in the water before roots ever appear.

Genovese basil — the classic large-leaved Italian variety — roots particularly reliably this way. Thai basil and lemon basil work well too, though they can take a few extra days to show roots.

Step 2: Take the Cutting Cleanly

To grow basil from cuttings in water successfully, the cut itself matters. Use clean, sharp scissors or snips — blunt blades crush the stem tissue and slow rooting. Make your cut just below a leaf node (the small bump where a leaf meets the stem). That node is where roots will emerge, so it needs to be submerged in water, not left dangling in the air above the waterline.

Cut at a 45-degree angle if you can. A diagonal cut exposes more stem tissue to the water, which gives roots more surface area to develop from. It also stops the cut end from sitting flat against the bottom of the glass and being deprived of water.

Take more cuttings than you think you need. Not every cutting will root at the same rate, and having three or four going at once means you’ll end up with at least two or three strong plants.

Step 3: Strip the Lower Leaves

Before you place the stem in water, strip off any leaves that would sit below the waterline. This step is non-negotiable when you grow basil from cuttings in water: submerged leaves rot quickly, and rotting leaves foul the water and introduce bacteria that can kill the cutting before it roots.

Leave two or three pairs of leaves at the top of the stem — that foliage is doing photosynthesis work and keeping the cutting alive while it focuses energy on growing roots. Don’t strip the stem bare, or the cutting has no way to produce the energy it needs.

A clean stem below the waterline and a leafy crown above it is the winning combination every time.

Step 4: Place the Cutting in Water

Now you’re ready to grow basil from cuttings in water in the most literal sense. Fill your clean glass or jar with room-temperature water — cold water can stress a fresh cutting — and pop the stem in so that the lowest leaf node is fully submerged but none of the leaves touch the water.

Room-temperature tap water is perfectly fine for most cuttings. If your tap water is heavily chlorinated, fill the glass the night before and let it sit uncovered; the chlorine off-gasses overnight. Alternatively, filtered water works without any waiting.

Place multiple cuttings in the same jar if you like, but don’t overcrowd them. Three cuttings in a wide-mouthed jam jar is comfortable; cramming in six or seven restricts airflow and encourages rot.

Step 5: Find the Right Spot and Change the Water Regularly

Placement is everything when you grow basil from cuttings in water. Basil is a sun-loving Mediterranean herb. It needs warmth and bright light to root well — a south- or west-facing windowsill is ideal in the northern hemisphere. Aim for at least 6 hours of bright, indirect light per day. Direct midday sun through glass can heat the water and stress the cutting, so a little shade in the hottest part of the afternoon doesn’t hurt.

Water quality is equally important. Change the water every two to three days — don’t wait for it to look murky. Fresh water keeps oxygen levels up and prevents the bacterial build-up that causes rot. Each time you change the water, give the glass a quick rinse too.

Keep the temperature above 18°C (65°F). Basil hates cold draughts, so keep it away from air-conditioning vents and draughty windows in cooler months. A warm kitchen is often the ideal spot.

Step 6: Watch for Roots and Know When They’re Ready

One of the best things about trying to grow basil from cuttings in water is that you can actually see the progress. In a clear jar, you’ll notice tiny white root nubs appearing from the leaf nodes within 5 to 10 days in warm conditions — sometimes even faster in summer. By day 14 to 21, most cuttings will have a visible root system of at least 2–3 cm (about an inch).

When roots reach around 3–5 cm (1–2 inches) long, the cutting is ready to transplant into soil. Don’t leave it in water indefinitely — water-rooted plants have fine, fragile roots adapted to a liquid environment, and they can struggle if left in water for too long before transitioning. Transplanting at the right time gives them the best chance of settling into soil smoothly.

If a cutting hasn’t shown any roots after three weeks, it probably won’t. Discard it, clean the jar, and try a fresh cutting from a healthier part of the parent plant.

According to the University of Illinois Extension, consistent warmth is the single biggest factor in rooting speed for soft-stemmed herbs like basil — so prioritise temperature over everything else.

Step 7: Transplant Into Soil and Establish Your Plant

The final stage when you grow basil from cuttings in water is the transplant. This step requires a gentle touch because those water roots are delicate. Fill a small pot (10–12 cm / 4–5 inches works well for a single cutting) with a good-quality, well-draining potting mix. Make a small hole in the centre with your finger or a pencil.

Carefully lift the cutting from the water, holding it by the stem rather than pulling on the roots. Lower the roots into the hole and firm the soil gently around them — don’t pack it tight. Water the pot thoroughly straight after planting, then let it drain completely. Never let the pot sit in standing water.

For the first week after transplanting, keep the plant out of direct harsh sun. The roots need a few days to adjust from a water environment to soil. After 7 to 10 days you should see new leaf growth — that’s a reliable sign the plant has established. At that point, move it to its final bright spot and begin light feeding with a dilute liquid fertiliser every two weeks during the growing season.

The Royal Horticultural Society recommends keeping basil in a consistently warm spot (above 15°C / 59°F at night) and pinching out the growing tips regularly to encourage a bushy rather than leggy plant — advice that applies just as much to propagated plants as to seed-grown ones.

Common Mistakes to Avoid

• Leaving leaves in the water. Any submerged leaf will rot within days. Strip them before the stem goes in the glass — every time.
• Using cold water or a cold room. Basil is tropical at heart. Temperatures below 15°C dramatically slow rooting and can kill cuttings outright.
• Forgetting to change the water. Stagnant water is the fastest route to rot. Set a phone reminder if you need to — every two to three days is the rule.
• Taking cuttings from flowering stems. A stem that’s bolting puts its energy into flowers and seeds, not roots. Always snip from a non-flowering shoot.
• Transplanting too early or too late. Roots shorter than 2 cm may not survive the move to soil. Roots left in water for more than four to five weeks become too fragile and water-adapted. Time your transplant in the 3–5 cm root-length sweet spot.
• Overcrowding the jar. Too many cuttings in one small container starve each other of oxygen and increase the risk of bacterial rot spreading between stems.
• Expecting supermarket basil to behave like garden basil. Supermarket basil is typically grown in very dense, multi-seeded pots under intense grow-lights and is not bred for longevity. It can still produce great cuttings, but choose the most vigorous stems carefully and don’t be disheartened if the parent plant fades quickly.

How to grow basil from cuttings in water All Year Round

Most people grow basil from cuttings in water during spring and summer when warmth and light are abundant, but you can absolutely do it year-round indoors if you have a warm kitchen and a decent light source. In autumn and winter, a small grow light placed 15–20 cm above your cuttings for 12–14 hours a day makes up for the lack of natural light and keeps rooting times comparable to summer.

A useful habit is to take a new batch of cuttings every four to six weeks during the growing season. Basil plants become woody and less productive as they age, so a rolling supply of fresh, propagated plants means you always have young, leafy growth ready for the kitchen. It’s an efficient cycle — the more you harvest from a mature plant, the more suitable cutting material it produces.

If you’re interested in building productive home systems of any kind, the same kind of methodical, step-by-step thinking applies to other areas of home and work life. For example, check out our review of the Best Robot Vacuum for Pet Hair if you’re looking to streamline another part of your home routine with the same ‘set it and let it work’ philosophy.

The BBC Good Food guide to growing basil also touches on keeping indoor basil productive through the year — worth a read alongside this guide.

Getting More From Your Propagated Plants

Once you successfully grow basil from cuttings in water and transplant your plants into soil, the real fun begins. Pinch out the top pair of leaves every week or two to encourage bushy, lateral growth rather than a single tall spike. This keeps the plant producing tender, flavourful leaves rather than going straight to seed.

If you’d like a neater home workspace to enjoy your indoor herb garden from — maybe you’re working from home and want a tidier desk area — our guide to the Best Standing Desk for Small Spaces covers some excellent compact options that can sit alongside a window herb garden beautifully.

Feed your transplanted basil plants with a dilute, balanced liquid fertiliser every two weeks once they’re established. Don’t over-fertilise — too much nitrogen produces lush growth that’s bland in flavour. A light touch is all you need.

When you notice the plant starting to flower again, pinch off the flower spikes immediately and take new cuttings. You’ll never run out of fresh basil, and you’ll never need to buy another plant again. That’s the real payoff of learning to grow basil from cuttings in water: it’s genuinely free, perpetually renewable, and deeply satisfying to do.

Frequently Asked Questions

How long does it take to grow basil from cuttings in water?

In warm conditions (above 20°C / 68°F) with good light, most cuttings show visible roots within 5 to 10 days. A root system long enough for transplanting — around 3–5 cm — typically develops within 2 to 3 weeks. Cooler temperatures or lower light will slow this down, sometimes to 4 weeks or more.

Can I grow basil from cuttings in water taken from a supermarket plant?

Yes, absolutely. Supermarket basil plants are dense with stems, making them a great source of cutting material. Choose the tallest, most vigorous stems, cut just below a leaf node, strip the lower leaves, and place in water as normal. The parent plant may decline quickly — that’s normal — but your cuttings can thrive independently.

Why are my basil cuttings rotting in water instead of rooting?

Rot is almost always caused by one of three things: submerged leaves decaying in the water, water that isn’t being changed frequently enough, or temperatures that are too cool. Strip all leaves from below the waterline, change the water every two to three days, and keep the jar somewhere warm — and rot problems usually disappear.

Do I have to transplant into soil, or can I keep the plant in water permanently?

You can keep basil in water long-term as a form of hydroponics, but it needs nutrients to thrive — plain water alone won’t sustain a mature plant. If you want to keep it in water, add a very dilute liquid fertiliser to the water. That said, most home growers find that transplanting into a good potting mix produces a bigger, more productive plant in the long run. It’s the easier path for most people who want to grow basil from cuttings in water as a practical kitchen herb.