Last updated on March 27th, 2026 at 08:01 am
Wave Petunias for Color. One of the best types of petunias that will thrive and bloom from mid-spring until late fall in the desert Southwest is the Wave Petunia.
What makes these Petunias so special?
Well, for one they will spread quickly and bloom throughout the summer months. You can plant them in the ground, but they are best suited in a large container or in a hanging basket.
Water often during the sweltering summer months, preferably every day. But make sure your pots drain well. Fertilize with a good 20-20-20 balanced fertilizer about once per month starting in mid-spring and ending in fall. If you have them in a hanging basket, it is important to water them a lot…yes, every day.
You do not have to dead-head wave petunias, just fertilize, water, and keep an eye on insects. Especially leafhoppers. These plants generate flowers all summer long.
The Colors of the Wave Petunias
They come in a variety of colors, from deep dark purple to bright white flowers. It is best to plant them in mass; the more the better.
Wave Petunias for Color
The one big problem with wave petunias or any type of petunia is that they are considered annuals. They will not come back the following season. However, there are some folks who manage to keep them alive throughout the winter seasons.
It’s covering them up with mulch or with a thermal plant blanket. I know this works because I’ve done it myself.
Where to place petunias
Plant them in full sun during the spring and fall months. A little shade during mid-summer will help them bloom longer. The best time to plant these colorful plants is after the last frost, typically in mid-March or so. They will look and add color to any container. Let them overflow for a great effect.
Deadheading Petunias for More Blooms
The process of deadheading petunias involves removing the faded or wilted flowers from the plant. By doing so, you are stimulating the plant to redirect its energy towards producing new blooms instead of setting seeds.
It is important to deadhead Petunias regularly. Deadheading not only promotes continuous blooming but also improves the overall appearance of the plant. Here’s a step-by-step guide on how to deadhead petunias:
- Inspect the plant: Start by closely examining the petunia plant and identifying the flowers that have started to fade or wilt. These flowers will have lost their vibrant colors and may appear droopy or dry.
- Locate the stem: Once you have identified a faded flower, follow the stem down to where it meets another set of leaves or branches. This is where you will make the cut.
- Make the cut: Using a pair of clean, sharp pruning shears or scissors, make a clean cut just above the set of leaves or branches. Be careful not to damage any new buds or healthy foliage while doing so.
- Dispose of the cuttings: After deadheading the petunias, collect the cut flowers and dispose of them properly. This will prevent any diseases or pests from spreading.
By regularly deadheading your petunias, you are encouraging the plant to produce more blooms and maintain a tidy appearance. This simple practice can greatly enhance the beauty of your garden or landscape.
Problems with these plants
On occasion, aphids, snails, and slugs will munch on the foliage or flowers of this plant. Spray with neem oil or insecticidal soap to keep aphids away. You can also place a pan with a low lip filled with beer. Snails and slugs love beer; they will fall into the pan and drown. Find out more about insects, snails, and diseases on this page. Insects and Diseases in Plants.
A little bit more about the wave and cascading petunias here.
Most garden centers will have these plants in stock from mid-spring until early fall. Ask for “Wave Petunias” at your local Nursery Store.
If you want plants that actually thrive in the Southwest, this will help you get there faster. Simple steps, real results—no guesswork. Southwest Gardening Made Simple.
Greenhouse Manager, Master Gardener, and Webmaster.
If you have any questions or enjoyed this post, feel free to share your thoughts in the comments below.
