This Is How Often You Should Really Deadhead Petunias for Healthier Blooms, According to Gardeners
Petunias are known for their vibrant, trumpet-shaped blooms and long flowering season, making them a staple in many home gardens. But to keep these colorful plants looking their best, regular maintenance is key, especially when it comes to deadheading. Removing spent flowers not only improves the plant’s appearance but also encourages more blooms throughout the season. So, how often do you really need to deadhead your petunias? We turned to gardening pros for the answer. Meet the Expert Julia Omelchenko is the resident botany expert at Plantum, a plant care and gardening app that helps identify plants and improve plant care. Kelly Funk is an experienced gardening expert and the President of Jackson & Perkins, an online plant nursery specializing in roses and other garden plants. Why Is Deadheading Important? When a plant’s flowers start to fade, it signals to the plant that it’s time to direct its energy into producing seeds. Deadheading disrupts this process and naturally extends the blooming season by removing the spent flower altogether, thereby redirecting the plant’s energy from seed production to producing more flowers. Not all flowering plants require deadheading, but many benefit from it, especially annuals like petunias. If you want your petunias to bloom all summer, deadheading is the way to do it. How Often Should You Deadhead Petunias? According to gardening pros, it’s best to deadhead petunias regularly to encourage more blooms and prevent them from going to seed. The frequency will vary slightly depending on your climate and the cultivar you have, but in general, you can expect to be deadheading your petunias at least once a week. “Ideally, petunias should be deadheaded at least once a week, but checking on them a few times a week is better, especially during peak bloom periods," says Kelly Funk, President of Jackson & Perkins. "I recommend making it part of your routine when watering or doing other tasks." Some petunia cultivars, such as Wave petunias and Supertunias, are bred to be self-cleaning, meaning they don’t require deadheading to encourage more blooms. Still, according to Julia Omelchenko, resident botany expert at Plantum, it’s best to prune these varieties occasionally to maintain their shape and stimulate vigorous growth. If deadheading your petunias multiple times a week sounds like a lot of work, we have good news for you: deadheading is super easy to do, and will only take you a couple of minutes to complete. The key is to ensure you’re doing it properly. How to Deadhead Petunias Deadheading involves removing the entire flower head once it starts to wilt. This includes the petals, the peduncle, and the receptacle. Basically, you want to remove the entire trumpet-shaped flower, including the green base that attaches it to the stem. This can be done by hand, or using sterilized scissors or pruning shears. “It’s important to deadhead properly by removing not just the petals but also the green base of the flower," Omelchenko says. "If you only pull off the petals, the plant will continue to produce seeds in the ovary." Additional Petunia Care Tips for Continuous Blooms Besides regular deadheading, there are a few other ways you can encourage your petunias to bloom all summer. Ensuring they have adequate light (full sun) and water (soil shouldn’t dry out completely) is the first step. Funk also recommends fertilizing your petunias every two weeks to help support vigorous growth. Finally, our experts say it’s common for petunias to start looking leggy by mid-summer, even if you’re deadheading regularly. To facilitate bushy growth, they recommend a light pruning to help tidy the plant. Not only will you be rewarded with fresh, compact growth, but you’ll also get a flush of new blooms.
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