Petunia is a genus of flowering plants with 20 species[1] that are native to South America. The name of the well-known flower with the same name comes from the French, who borrowed the term petun, which means “tobacco,” from a TupiGuarani language. A delicate perennial, the majority of the cultivars found in gardens are hybrids (Petuniaatkinsiana, also known as Petuniahybrida).
Petunias naturally grow in what regions?
A member of the Acanthaceae (Acanthus) family is the fringeleaf wild petunia. Around 2500 species in this family can be found globally, and they range from small trees and shrubs to herbs. A majority are tropical. Although there are a few species of this genus in the United States, they are mostly found in the tropics. Except for South Carolina, this species can be found from Pennsylvania, Ohio, and Michigan in the west through Minnesota, Iowa, and Nebraska in the south to Texas in the east to Florida. It happens in northern Mexico as well.
Wild petunias with fringed leaves grow from short rhizomes. A single plant has the potential to grow into a cluster that is 30–70 cm (1–2 ft)–diameter over time. Stems may be 4 to 12 inches (10 to 30 cm) tall. Simple, hairy, and measuring between 2 and 3 centimeters (3/4 and 1 inch), the leaves are also 1.3 centimeters (1/2 inch) broad. Along the border of the leaves are hairs that resemble fringes. In the axils of the leaves, little clusters of flowers are produced. They are roughly 3.8 cm (1.5 in) across and purple. In the flower’s center, there are noticeable bee guiding lines. Depending on the locale, flowering might last until September after starting in June.
The flower’s likeness to a garden petunia is the source of the common name. The fruit resembles a little capsule. Common habitats include sandy soil in dry prairie, fields, meadows, and open forests. In these places, it is typically plentiful. It can be grown, although a garden may find it to be very weedy. Never dig up wild plants.
Where were petunias first grown?
For well over a century, petunias have been a favorite flower in gardens. The free flowering, vibrant displays that overrun beds, pots, and hanging baskets during the cool seasons are enjoyed by Florida gardeners. Impatiens, geraniums, and marigolds are competitors for this popularity, but during the course of almost ten years of yearly surveys, the petunia has consistently placed first or second as America’s best-selling annual.
A French botanist by the name of Petun collected the first garden petunia seeds from native stands in Argentina in the middle of the nineteenth century. The genus was subsequently given the name Petunia in honor of the botanist since plantings were a pleasant addition to European gardens.
Almost immediately, breeding to choose improved types started. Theodosia Shepheard of Ventura, California, introduced “Giants of California,” the largest flowering petunia type that is still sold, in the 1880s. This dominant type, which had blooms up to 7 inches in diameter until the 1930s, served as the foundation for the numerous flower varieties that are now found in gardens.
According to Teresa Howe, a researcher assessing petunia cultivars at the Institute of Food and Agricultural Sciences Research and Education Center in Bradenton, home plantings can include petunias with large flowers or just plenty of them. With flowers that frequently open at a size of 4 to 5 inches across, grandiflora types unquestionably have the size edge. Although there are fewer flowers per plant, she claimed that gardeners enjoy the huge, bold displays. Grandifloras also come in cascading varieties that are great for hanging baskets.
Petunias with several flowers, or multifloras, are the most showy to see in big plantings. According to Howe, the flowers are smaller, typically less than 3 inches wide, but they are produced in large quantities. They seem to have less health issues and are quite active. Both the multiflora and grandiflora families contain double flowering variations, but home gardeners tend to favor single-blossom cultivars.
Howe estimates that there are hundreds of petunia varieties available for home cultivation, with new varieties being developed every year. The new picottee varieties, which have blooms with a solid hue and a white edging, will appeal to gardeners.
Dark-veined flowers are likewise well-liked. “Summer Madness,” a vivid rose-red with dark crimson veins spreading from the throat, serves as an illustration. To plant in next annual gardens, gardeners can also explore for new colored types with white necks.
According to Howe’s research on roughly 30 different types, home gardeners can choose their preferred petunia by looking at the flower color, blossom size, plant growth pattern, and blooming time. Summer Madness and White Flair were consistently early flowering types that did well in both the spring and the fall. “Pastel Pink Sails,” “Popeye,” “Stoplight,” “Summer Madness,” “Tahitian Sails,” and “Victory” are all good choices for bedtime listening. “Blue Cheer,” “Pastel Pink Sails,” “Popeye,” “Summer Madness,” “Tahitian Sails,” and “Victory” all did well in the hanging basket trials.
According to Paula Cyr, grower-manager at Poole and Fuller’s Constant Color Nursery in Union Park, producers are looking for extra-early flowering types. Quick-flowering cultivars, which are quite popular, cut the typical nine-week production time to six to seven weeks. She describes the “Flush” line, which features solid red, blue, purple, pink, and white colors, as a quick-blooming plant that is perfect for home gardeners and nurserymen. With its vivid pink blossoms and prolific flowering habit, “Popeye” is another favorite.
“Sugar Daddy” is a petunia that has been grown for more than ten years and is still a favorite, according to Cyr. It is the original, vivid orchid grandiflora with veins that are accentuated in deep burgundy crimson. The large four-inch ruffled blooms are popular with gardeners. Also popular are petunias with alternating white and colored stripes. Choose from “Viva,” “Calypso,” and “Joy” series members for this unique flower feature.
— Before planting the transplants, prepare the planting location by adding lots of organic matter and applying a little amount of fertilizer. Feed the planter with a balanced fertilizer, such as a 6-6-6 product, if you want foliage growth to fill the bed. However, she advised using a low nitrogen bloom special if you wanted speedy flowering.
— By pinching off the growing tips, you can force the petunias to spread out and cover the bed. Although the additional stems they create will each yield a bundle of blossoms, it will only slightly delay flowering, according to Cyr. Additionally, as the plants get older, gardeners should remove the wilting flowers and trim back any tall or lanky growths. Petunia beds will endure months instead of weeks if the spent flowers are simply removed, she claimed.
— By adding multiple petunias to a container, hanging basket displays for sunny settings can be made. As the plants begin to grow again, choose the cascade varieties and pinch the emerging shoots. To help fill the baskets with greenery before the flowers bloom, these will require weekly feeding.
Keep the soil moist is one cultural guideline for gardeners to remember, according to Cyr. Petunias rapidly deteriorate and lose their ability to produce foliage when conditions are too dry. She advised planting in improved soil and watering when the earth’s surface started to dry out.
The aroma of flowers is another aspect that is sometimes disregarded while choosing petunias. Even while no variety makes a claim to improve the petunia’s perfume, it’s nonetheless a pleasant characteristic during a morning garden stroll.
Do petunias grow naturally in North America?
Petunia is a genus of roughly 35 flowering plant species that are native to South America and members of the nightshade family (Solanaceae). The common garden petunia (Petunia atkinsiana) is a decorative plant that is well-liked for summer window boxes and flower beds because of its eye-catching trumpet-shaped flowers.
The majority of petunia species are annual herbs. The leaves are usually oval in shape with smooth margins and sessile (i.e., lacking a petiole, or leaf stem); some include tiny, sticky hairs. Five united or partially fused petals and five green sepals make up the funnel-shaped flowers. Although P. exserta is pollinated by hummingbirds, the majority of species are pollinated by insects. In a dry capsule, the tiny seeds are carried. Some old Petunia species have been reclassified into the closely related genus Calibrachoa, which is notable for the decorative plant known as “million bells,” thanks to molecular data (C. hybrida).
Do petunias constitute an invasive species?
Mexican petunia is a lovely perennial with blue to purple flowers that can be found in select garden centers.
Due to its three-foot height, Mexican petunia has long been employed by gardeners to heighten perennial borders.
However, Florida has designated Mexican petunia (Ruellia simplex*) as a severely invasive plant. This implies that it can wriggle out of backyard gardens and spread into the wild, displacing native species.
Unless you can buy a variety like “Purple Showers” that has been studied and expressly found not to be invasive, you shouldn’t put Mexican petunia in your yard.
Ruellia caroliniensis, a native wild petunia, is also present but is less common. You can protect Florida’s natural regions for future generations to enjoy by making wise decisions and refraining from planting invasive plants.
(*Note: Due to taxonomy regulations, the Latin name of the Mexican petunia has changed numerous times. Enough said. If you buy a Mexican petunia plant, make sure it’s either the caroliniensis variety, which is endemic to the area, or a sterile cultivar. If in doubt, check with the vendor.)
How long does a petunia live?
In response to your query, petunias can survive in warmer areas for two to three years. In frigid climes, petunias are actually annuals, despite popular belief. As a result, they might not be able to endure the bitterly cold winter weather.
Therefore, you must make sure they are out of the cold if you want your petunias to live for two to three years. The greatest strategy for accomplishing this is to keep them indoors.
All you need is a plan in order to accomplish this. You’ll need to put the petunias in a tiny container for this.
Published: March 19, 2012
Petunias are among the few flowers that are as closely associated with gardening. A longtime favorite, petunia was known for having a wide variety of colors, being very simple to grow, but not being especially heat tolerant. The advancement of petunia as an aesthetic plant fell behind more “exotic” species as the floricultural world looked for new species to decorate our landscapes (and boost bedding plant sales). However, due to advancements achieved in vigor, heat tolerance, and general garden performance, recent work has produced petunias that gardeners of the past may not recognize.
The Solanaceae, also known as the nightshade family, includes petunia. A few particularly evil members of this family are tobacco, deadly nightshade, and angel’s trumpet. In contrast, the nightshade family also includes the very valued food crops potato, tomato, pepper, and egg plant. The scientific name of the common garden petunia, Petunia x hybrida, denotes that it is a hybrid plant. In actuality, P. axillaris, P. inflata, and P. violaceae—all wild species of petunia endemic to the more temperate regions of South America—were crossed to produce common garden petunia. The latter is important because it provides an explanation for why petunia, which is frequently categorized as a semi-hardy annual, struggles to survive in the heat and humidity of a typical Missouri summer. This is particularly true of the “older” cultivars, which often went through a “summer swoon” before being severely pruned to get ready for new growth and bloom in the cooler fall months.
Grandiflora and multiflora are the two flowering forms that petunias are often divided into. Grandiflora varieties are distinguished by their huge, elaborate, heavily ruffled petals; in some cultivars, these blossoms can measure up to five to six inches in diameter. Smaller, less elaborate, but more numerous, blooms are found in multiflora varieties. Grandiflora varieties are reputed to be “more showy,” whilst multiflora varieties are supposed to be more tolerant of the weather (heat and rain), with more blooms. Plant breeders created double varieties of each of these two types along with a plethora of various flower hues and color patterns along the way. With the release of the “Madness” series in the 1970s, petunia breeding saw a “breakthrough.” Although the size and elaborate appearance of the flowers in this series were similar to those of grandiflora kinds, multiflora types were more weather tolerant and had more blooms per plant. This series was given the name “floribunda” to distinguish it from other petunias available on the market. One reason why petunias are now used more frequently in warmer parts of the United States and are receiving more attention from plant breeders is the success of the “Madness” variety.
The gardening world is flooded with new petunias, many of which are vegetatively propagated, despite the fact that grandiflora, multiflora, and floribunda petunias continue to be quite popular. The “Supertunia” series, which is a part of the Proven Winners collection of plants, was likely the first variety of petunias to be vegetatively propagated. They have an extremely strong growth pattern, better weather (hot) tolerance, and a profusion of blossoms. However, it should be noted that petunias grown vegetatively typically require more fertilizer than normal, seed-grown varieties. Another Proven Winners petunia introduction is the “Surfinia” series, which some people believe has a better growth habit and is easier to grow than Supertunias. As other businesses copied them, names like “CascadiaTM,” “SangunaTM,” and “SuncatcherTM” are now widely used in the bedding plant industry. Most are either plant patented or trademarked by their creators.
In addition to the aforementioned, there is the exceptional “Wave” line of seed-propagated petunia. They offer excellent selections for beds where a magnificent ground cover is sought because to their amazing garden performance. Unlike “normal” petunias, they bloom freely throughout the summer without the need for pruning. Tidal Wave, Easy Wavy, and Shock Wave are relatively recent additions to the series; while they each have a distinctive growth habit, they all perform quite well in gardens. The ‘Morn’ series of miniature (or “milliform”) petunias is a final (relatively) new seed propagated species. The series is distinguished by compact plants with numerous little flowers that are exceptionally tolerant of the elements.
Petunias thrive in a variety of soil types and like full sun in the garden. Most likely, a well-drained, porous soil with medium fertility promotes the best growth. The optimal pH ranges from 6.0 to 6.5 and contains significant concentrations of phosphorus and potassium. To encourage the formation of a robust root system and to aid in the prevention of root rots, soil porosity is crucial. Dig a hole in your flower bed that is between 10 and 12 inches deep and fill it with water to check for porosity. Fill the hole once more the following day and time how long it takes for the water to drain. If the water runs out within 8 to 10 hours, your soil should have sufficient porosity to support healthy growth. It is advised to use organic matter to assist create more porosity if the soil has a slower drainage rate.
Applying maintenance amounts of fertilizer to the bed should be done before planting petunias. The area that will be planted should receive two pounds of a complete fertilizer, such as 5-10-5, per 100 square feet. Before planting, make sure the fertilizer has been thoroughly mixed into the soil. It is preferable to add extra top-dressings of nitrogen in the form of ammonium nitrate during the summer at a rate of around one pound per hundred square feet. If there is no rain predicted, water in softly after application. The more active and heavy feeder petunias that are vegetatively propagated could require repeating this process. A reliable indicator of the demand for fertilizer is plant vigor.
Petunias require little maintenance during the growth season once they are established. Although it is not necessary, deadheading aids in making plants more beautiful and, in some varieties, increases flower production. It is advised to use additional irrigation to supply roughly 1.5 inches of water each week during hot, dry conditions. Cutting plants down to a few inches from their root will help them recover if they become overly “leggy” and cease blooming. A top-dressing of fertilizer should now be administered at the aforementioned rates. With root rot and Botrytis being the two most bothersome diseases, petunias are said to be rather pest-free. Both become more of a problem when it rains or when you overwater.
You might be in for a nice surprise if you haven’t recently given petunias a try in your garden. The public can choose from a wide variety of new and enhanced petunia varieties thanks to the efforts of plant breeders.