Why Basil Flowers: How to Prevent Basil Flowering and What to Do if it Does

Basil flowers are a common occurrence for basil plants, and it can be difficult to prevent them from flowering. However, there are some things you can do to encourage the growth of more basil leaves instead! In this blog post we will talk about why basil plants flower and what gardeners can do to prevent or encourage basil flowers.

flowering basil plant with white flowers

Many beginner herb gardeners are surprised when, at some point in the summer, their basil plant suddenly develops flower buds, which then transform into beautiful purple or white flowers.

While a basil plant flowering isn’t the worst thing in the world, I’m afraid to say it means your plant’s life is probably limited once you see the flower buds, and it’s no longer suitable for propagating basil cuttings, either.

As annuals, basil plants rarely last more than a year, even inside. For outside plants in most growing climates in the Unites States, they last even less: for the summer, and gone at first frost.

If your basil flowers, it’s simply following its natural growing cycle, and the flowers will be followed by the plant producing seeds. Once it gets to this point, the leaves are no longer the fragrant, delicious and tender leaves you got previously, and aren’t as suitable for using in the kitchen.

So what can you do about it? If you want to prevent a basil plant flowering and seeding cycle, the secret lies in regular pruning.

If you’re interested in basil flowers (and how to avoid them) or what to do with a basil plant that’s flowering (and the basil flowers it produces), keep reading for my best tips and advice.

Why Basil Flowers

Simply put, basil is an annual plant, which doesn’t come back year over year like some edible herbs, such as chives.

Well watered with lots of sunshine, and left to its own devices (aka: not pruned regularly), your basil plant will flower, producing lovely white or purple basil flowers on the plant, before going to seed.

Why Would I Want to Prevent a Basil Plant Flowering and Seeding?

While basil flowers look lovely and are very nice for bees in your neighborhood, a flowering basil plant signifies the end of your ability to use the plant in your kitchen.

Once a basil has flowered, the leaves it produces changes. They’re less flavorful and aromatic, and the stems get a bit woody.

This is because, after flowering, the plant invests its energy into producing seeds to grow next year (collect them!), rather than producing the tender and fragrant leaves you’ve enjoyed up to this point.

If you’re growing basil because you want to eat the leaves, then you’ll want to prevent the plant from flowering, so you get the best possible quality and flavor, and so you can enjoy fresh basil for longer.

If you want both the leaves and flowers basil produces, you can grow a series of plants, all at different stages of the growing cycle, about 1 to 2 weeks apart is ideal. This way, you’ll have plenty of leaves, as well as some lovely flowers throughout the season.

Can You Eat Basil Flowers, or Basil Leaves After the Plant Flowering?

Yes! Basil flowers are safe to eat, and taste like young leaves, only milder. Toss them in salads, or throw them on top of a meal you’d typically use leaves in as a garnish. You can also use them when making pesto.

white flowers on a basil plant

After flowering, the leaves are also safe to eat, although they’re not as delicious as pre-flowered basil leaves are. Sometimes, they’re milder, but you may also find them to be tougher and more bitter than the tender, fragrant leaves of a younger plant. Or even wilted.

  • Sprinkle or toss in a salad or pasta dish
  • Boil with water to make basil flower tea
  • Serve as a garnish on a cheese and charcuterie platter
  • Use them to make a batch of basil flower vinegar or basil flower olive oil (basically, infuse clean dry basil flowers in red or white wine vinegar or olive oil for 2 weeks to a month, then strain and remove for flavored vinegar or oil).

How to Prevent Basil Flowering

They key to preventing basil flowers is regularly pruning your basil.

Pruning sends a magic message to your basil that it’s not time to flower yet, so please keep making delicious new leaves.

As a general rule, I prune my basil every one to two weeks or so, or when the plant reaches around 8 inches high (the maximum you want it to reach).

Prune from the top, which lets more sunlight reach the leaves below, and stimulates more leave growth and a healthier, bushier plant full of delicious leaves.

If you haven’t pruned fro a while you’ll notice the leaves at the top of the plant are really small – those are actually flowerettes, and pruning them off will really encourage more plant growth.

A beginning flower bud on a basil plant

Pruning your basil doesn’t have to feel like a chore – simply pinch near the stem, and grab at least the two top leaves on each stem. Then use them to cook, of course!

As with watering your basil, it’s best to prune in the morning. The leaves are in the best condition before the heat of the day, with the strongest concentration of the aromatic oils.

Of course, remove any damaged leaves while you’re at it, especially basil leaves with holes, brown spots, or anything that is obviously dead or rotting.

What To Do With Basil Flowering When You Don’t Want it To?

If you notice one or two flowers on your basil, don’t lose all hope.

Simply grab a pair of garden shears and cut them off. This will signal to the plant that it’s time to keep directly energy into leaves, not flowers.

If it does go to seed, save the seeds to plant in your garden next year!

Summary And What To Try If Your Basil Plant is Flowering?

  • Basil flowers when its not pruned regularly, so make sure you prune every two weeks, or once your plant reaches 8 inches tall
  • To prune a basil plant, pinch the leaves at the top, removing at least the two top leaves from each stem
  • Once your plant flowers, it will also seed, and the quality of leaves it produces will no longer be of the best quality or taste for using in the kitchen
  • The flowers are edible, and have a milder taste than the leaves, so feel free to add them into your recipes and experiment a bit, if you have them!