Herbs

How to Prune Basil From Top to Bottom

Basil is a tender, annual, aromatic herb that grows from a single stem. The culinary herb has fragrant leaves that are used extensively as a condiment, paired with tomatoes, and also as a drink flavoring. To help basil produce as....

many leaves as possible, learning how to prune the plant is key.

Pruning basil increases both stem and leaf growth. Sweet basil, the variety grown most often, can be shaped into a rounded bush 18 to 24 inches tall and wide. Grow basil easily from seed, but it will need warm soil to germinate. It is sensitive to temperatures below 45°F and grows best in temperatures of 80°F and above. In northern climates, basil has a relatively short growing season. In more southern climates, the growing season may last a little longer, however, constant warm temperatures encourage flowering.

Tip
Basil flowers attract pollinators and are also edible, but allowing the herb to flower can cause the leaves to turn bitter. Flowering also leaves a terminal bud that will halt the growth of new leaves, which results in a lack of harvestable basil.

For the best harvest, pruning should begin early to get the plant started right with a branching habit. Each time you cut back a stem, two new stems will branch out from that cut, so consistent trimming is important to help the plant reach its most productive form. Follow these instructions for growing your basil into a full, bushy plant with plenty of delicious leaves.
When to Prune Basil
Basil is a plant that starts with one central stem, so you want to begin pruning fairly early, when it is 6 to 8 inches tall and has three to four sets of opposite leaves. It can be tempting to harvest those early green leaves, but pruning too early can rob the plant of the energy it needs to grow. Snipping or pinching back the central stem to 1/4 inch above the first set of leaves will create two new branches. As the plant begins to bush out with multiple stems, you can prune up to half of each stem. Be sure to always pinch or cut just above a set of leaves. Harvest any leaves on the portion of the stem you have pruned off.

To encourage additional branching and more leaves, you will need to prune your basil regularly throughout the growing season. This herb will grow quickly during warm weather and should be checked daily when temperatures approach 80°F. When grown from seed, sweet basil will reach maturity at 65 to 70 days, and flowering will increase. Pinch back flower buds as they form as part of your pruning regimen.

The best time to harvest most aromatic herbs, which include basil, is in the morning after the dew has dried or in the early evening before the dew has fallen. The essential oils that give the herb fragrance and flavor are at their peak concentration during these times.