Should You Cut Your Petunias If the Flowers Die? What Gardeners Do for Better Blooms

Key Points

Deadheading old petunia flowers makes plants flower more.

Trimming petunias back regularly can also enhance flowering and make plants bushier.

Heat, water stress, pests, and low lighting may cause petunia flowers to fade prematurely.

Are your petunia flowers dead and you don’t know why? Although petunias are prolific bloomers that can flower from spring through fall, they benefit from frequent deadheading and may not bloom as abundantly if they don’t receive the right care.

In this guide, plant pros share how to prune petunias for more prolific blooms, and ways to jumpstart flowering if your petunias are looking a little low.

Meet the Experts

Eva Ward oversees the annual greenhouse team at Ward’s Nursery.

Should You Cut Petunias If the Flowers Die?

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Yes! Although many flowering plants only need to be deadheaded once or twice during the growing season, petunias benefit from frequent deadheading and flower more if you pinch off old flowers regularly from spring through fall.

Exactly how much deadheading your plants will need varies depending on the type of petunias you’re growing.

“The larger flowering petunias require regular deadheading to keep them blooming,” says professor of horticulture Cynthia Haynes. “Newer cultivars are more prolific and don’t require much deadheading to keep them blooming all summer.”

Like deadheading, the amount of pruning petunias will need during the growing season can also vary from petunia variety to petunia variety. However, pinching off a few stems on your plants every week will encourage any type of petunia to branch out and flower more.

What to Do With Petunias After the Flowers Die

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Petunias have a long bloom time and should flower well into fall with proper care. But they may bloom less if you don’t deadhead old flowers or if your plants get stressed by heat, dry soil, or other environmental factors.

The good news is that you can usually trigger your plants to rebloom by pinching back old flowers and adjusting the specific growing conditions that may be causing your petunias to flower less.

Why Your Petunia Flowers Died

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Dead petunia flowers aren’t always cause for alarm. But if your petunia blooms have died prematurely or your plants are flowering less or not at all, there may be a few different factors to blame.

Natural aging. Each petunia flower only lasts for a few days before it starts to wilt. This is a normal plant process, but you can improve the look of your petunias by pinching the old flowers away.

Water stress. Both overwatering and underwatering can cause petunia flowers to wilt prematurely or make the flowers and buds fall straight off the plant. To avoid this, water your petunias when the top inch of soil feels dry.

Heat. Ultra hot days can also lead to bud drop and wilting petunia flowers. Keeping petunias well-watered and temporarily moving potted plants into partially shaded locations during the hottest part of the day may help.

Low light. Petunias may not flower at all if they don’t receive enough light. Plants may also drop their flowers and stop blooming if you move petunias from bright sun to overly shaded locations too quickly.

Budworms. Budworms are small, striped caterpillars that feed on certain plant flowers and can riddle petunia blooms and buds with holes. Check your plants regularly and remove any caterpillars you see by hand.

How to Cut Petunias

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Aside from regular deadheading, trimming petunia stems from time to time will refresh your plants and encourage them to flower more. Here’s how:

Start early. Cut back the tips of petunia stems to the closest leaf node when you transplant petunias for more branching and flowers.

Prune regularly. During the growing season, prune off a few of the longest and oldest petunia stems by 1/3 to 1/2 every week. Each stem you cut will branch and produce more buds.

Refresh plants in summer. “In midsummer, I recommend trimming back petunias by about 1/3 to 1/2, especially if they get leggy,” says Eva Ward of Ward’s Nursery. “This removes faded flowers, encourages fresh flower buds, and creates bushier plants.”

Use the right tools. Old petunia flowers can simply be pinched back with your fingers when deadheading, but it’s best to use sharp pruners or scissors to trim petunia stems. Cleaning and sterilizing pruners in between each plant can keep petunia diseases from spreading.

Read the original article on The Spruce