Herbs

How to Propagate Basil for a Fresh Supply of Herbs All Year Long

Knowing how to propagate basil means always having a fresh supply for your kitchen all year long, no matter where you live. Basil is one of the easiest plants to propagate. Dozens of varieties of this highly aromatic and versatile....

culinary herb (Ocimum basilicum) exist, so it's not difficult to keep your favorite going even during the off-season.

Now that you know how to grow this delicious plant, here's how to propagate basil.

Ways to Propagate Basil
There are three ways to propagate basil: from cuttings placed in water, soil, or grown from seed.

Basil is a warm-season herb most often started from seed in early spring or planted directly into the garden once the soil has warmed to between 50°F and 70°F, but it can also be grown indoors. It grows from seed outdoors when the stems have gone to flower. But to keep a basil plant going throughout the cool season, you'll need to propagate with cuttings from your mature, summer-grown basil.

Tip
Propagating basil from seeds is common but not always the favored method. Basil seeds are problematic because they may not have high germination rates, grow slowly, and produce plants with inconsistent flavor. Propagation from cuttings is a much more reliable method.1

How to Propagate Basil in Water
The best method to propagate basil from cuttings is in water. If you've ever kept freshly cut basil stems in water for use in cooking, as needed, you may have noticed that after a week or so, the stems begin to put out new roots. Essentially, this is propagating the basil cuttings in water.

Propagating basil in water is easy and requires little more than refreshing and topping up the water regularly. To grow new basil plants this way, you need a sharp, sterile snipper, clean water, and a clear glass, vase, or container.

Take several 4-inch cuttings from a mature basil plant, avoiding any stems with flowers at the top. Make your cuts below a set of leaves or leaf nodes.
Remove all but the top two sets of leaves from the cutting.
Fill a clear glass with water. Water that has not been chemically treated (i.e., distilled water or rainwater) works best.
Submerge the stems, keeping the top leaves above water level.
Place the glass on or close to a sunny windowsill where it receives plenty of bright, indirect light and warm temperatures.
Change the water weekly or more often if it begins to get cloudy.
You should see roots begin to form in 12 to 18 days.
Tip
Basil rooted in water will continue to grow out for extended periods of time. Eventually, though, the herbs need additional nutrients. Adding specialized fertilizers to the water is a practice called hydroponics. Alternatively, you can pot the rooted basil into a soil-based medium, and it can get nutrients that way.

How to Propagate Basil in Soil
Propagating basil cuttings in soil is similar to propagating in water. Both methods are simple and usually successful.

Gather together a sharp, sterile snipper, deep pots with drainage holes, potting soil, and plastic covering. Growth or rooting hormone is optional.

Fill a pot or pots with slightly moistened planting medium. High-quality potting soil works well. You can start several cuttings in a large 6-inch pot or plant individual cuttings in smaller 4-inch pots.
Using the snipper, take 4-inch cuttings from a mature basil plant, avoiding any stems that have flowers on them. Make your cuts below a set of leaves or leaf nodes.
Remove all but the top two sets of leaves.
Dip the bottoms of the cuttings in growth hormone. This step is optional since most cuttings root easily without it.
Use your index finger to poke narrow, deep holes in the potting soil.
Insert a cutting into each hole, making sure to keep the top leaves well above the soil surface.
Tamp soil down around each cutting to keep it upright.
Water thoroughly.
Cover the pot loosely with plastic and use a small stake or pencil to keep the plastic from touching the cutting.
Place pot(s) in a location that receives plenty of bright, indirect light and warm temperatures. Keep soil moist but not soggy.
Remove plastic for an hour or so daily to allow air circulation and prevent mold.
As soon as new leaves emerge, remove the plastic and check to see if the cutting has rooted. If a gentle tug results in a little resistance, your basil cutting has roots. This usually occurs in two to four weeks.