Many of us in the Southeast think of the showy petunia as a summer favorite, whether strolling along a small-town street and seeing beautiful pink, white, and purple petunias cascading from window boxes and hanging baskets or seeing them spilling into the garden path in the yard. The petunia is one of the few plants that can withstand the intense summer heat while still producing an abundance of color.
The native Petunia integrifolia, which reseeds itself in our garden, adds a pleasant splash of color and threads its way throughout the entire summer. This petunia is unfazed in the least by a drought or bad soil and thrives in the heat and sun. Two-inch magenta blossoms have a pleasant aroma and attract hummingbirds and butterflies. These devoted companions will continually reseed themselves, so there is no need to collect their seeds. They don’t seem to be bothered by bedding lines or other annoying restrictions on their growth, yet they are also so endearing that it’s hard to label them as intrusive. One is flowering in the center of the gravel where we park the car as we type this, appearing unconcerned about the nearby traffic and unfavorable living conditions.
If you choose to save the seeds from this variety of perennial petunia, store them in a cool, dry area over the winter, and after the final frost, scatter them straight onto the soil in full sun. Plant them just blended with the earth, not deeply. The reseeding petunia prefers good drainage, like other petunias do. The plants stretch out to a height of 3 feet and a width of 6 to 8 inches. To keep ours under control, we occasionally prune them.
Together with potatoes and tomatoes, petunias are considered a member of the nightshade family. The first cultivators of the hybrids we know today were Europeans, particularly German, English, and Japanese horticulturists, who were enthralled by their color and simple breeding characteristics. They were initially identified by gardeners in Europe and North America in the middle of the 1700s. In the 19th century, they shot to fame in the gardens of Europe. Travelers of the modern day will be familiar with the spectacular hanging baskets that adorn light poles and balconies in cities all around Europe. Our typical garden petunia, Petunia hybrida, is a hybrid of two Argentinean native species.
Back in the 1930s, Charles Weddle of the Atlee Burpee Seed Company in this nation was in charge of the most of the cultivar work on petunias. There are four fundamental varieties: floribunda, multiflora, grandiflora, and spreading. The spreading or “Wave petunia has gained a lot of popularity in the last ten years and can be found in early spring at almost any nursery. Deep purple, magenta, light pink, and white are among the colors. Additionally, mixed-color petunias are offered; a few examples include white with delicate bands of magenta, pink, and purple.
Rich, light soil that is well-drained is ideal for petunias. Every few months, they enjoy a little compost or fertilizer. Petunias don’t like to get wet, so if you want to incorporate them in a hanging basket, stay away from pairing them with plants that require a lot of watering. Petunias should be spaced 15-20 inches apart, with the others being planted 4 inches apart. Petunias all readily root from cuttings, but seed sowing is equally simple. Their quick development and impressive outcomes are positive traits that might inspire young gardeners as well.
Petunias thrive in environments other than containers. The sunny bank is one location for petunias that is frequently disregarded. If you have a bank in your yard that is convenient for watering, consider sowing it with drifts of vibrant petunias in the early spring. All summer long, they will take care of themselves and spread cheer.
When growing petunias, there are three key things to avoid: shading, overwatering in wet weather, and getting water on the blooms. Since water on blossoms can force them to close, try to irrigate plants from below using a wand or irrigation system.
When should petunias be planted?
One of the most widely used flowers in Louisiana is the petunia. They can be planted in late winter or early spring for warm-season color or in the fall for cool-season color. In local garden centers, you can discover a variety of petunias, as you can with practically any bedding plants these days.
Plant petunias in late January through mid-March for greatest results, or from late September through early November. South Louisiana petunias perform well in the winter. The severity of our winter has a big impact on how well they perform.
Petunias are available in a variety of floral colors. Both single- and double-flowered petunias are available. In general, single-flower forms are more durable over time than double-flower forms.
The following are some “best management methods” to help you enjoy your petunias from now until late spring:
Make sure the garden bed is properly prepared to provide for adequate internal drainage and aeration.
Is it too soon to put petunias outside?
Petunias can be grown from seed, purchased as little plug plants to grow on, or purchased as plants that are ready for the garden. Because petunias are delicate and cannot withstand any frost, you must wait until late spring or early summer to plant them outside.
A good, rich soil is necessary for petunias to grow well. Before planting, prepare the soil in borders by incorporating a lot of well-rotted compost or soil conditioner. Petunias grow best in multipurpose, peat-free potting compost for pots and containers. Choose a compost that has water-holding granules for raised containers like hanging baskets and window boxes that are exposed to drying sun and wind.
Petunia spacing is greatly influenced by their development pattern, final size, and the environment in which they are produced. Plants can be crowded closely together in pots and other containers to create a stunning display quickly. The smallest compact and upright kinds can be planted as close together as 15-20 cm; bushy petunias with a loose, mounding habit require a wider spacing of about 30 cm; and trailing varieties require a spacing of about 40 cm.
Petunias should be gradually acclimated to the outside for a week or two before being planted outside. When purchasing garden-ready plants, make sure they haven’t been kept in a covered area or in the event that they have, they will need to be hardened off before planting.
Where to grow petunias
Petunias require a lot of sunlight, rich soil, and protection from wind. Petunias will also thrive if given some shade in regions of the country with hot summers or milder climates.
Because of their extreme adaptability, petunias can grow in practically any kind of pot or container, regardless of size or shape.
Petunias that trail off the sides of pots or window boxes make excellent plants for hanging baskets, raised pots, or window boxes. They can be planted to tumble down slopes, banks, and from raised beds, and they create a distinctive and vibrant ground cover in borders.
In a colorful bedding arrangement, as a splash of bright color amid the perennial plants in a border, or as part of bushy, upright arrangements in pots or planted in the ground, petunias make excellent displays.
How to care for petunias
Petunias grown in pots and containers require regular watering, which is crucial. Avoid letting the compost dry out, but also be careful not to overwater it because this can result in spindly growth. During dry seasons, petunias planted in the ground also require watering.
To prevent sunburn on the tender leaves and huge flower petals, direct the flow of water onto the earth rather than showering the plant. In order to avoid burning, try to water in the early morning or late at night when it’s hot outside.
Feed plants with a potash-rich liquid fertilizer every 10 to 14 days in the summer and early fall (such as tomato fertilizer). Switching to a high-nitrogen fertilizer can accelerate growth for the final few weeks before the frosts if plants start to look drained in the fall.
Petunias appear better and produce more flowers when fading and dead flower heads are removed. Later in the season, trailing kinds that start to look straggly can be softly clipped. Feeding simultaneously will encourage new growth.
How to propagate petunias
Although they are not the easiest of plants to propagate, petunias can be produced from seed. When the temperature is 21C in late January, seed should be sowed. Petunia seeds need light to germinate, so don’t cover them. Instead, sow them on the surface of moist compost and cover them with polythene or place them in a propagator to keep them from drying out. Seedlings require a warm, well-lit, shaded habitat that is between 13 and 15 degrees Celsius.
A excellent middle ground between starting from seed and purchasing more expensive garden-ready plants is to purchase petunia plug plants. Early to mid-spring, mail-order plug plants are available. Plant them out only after hardening off and when all threat of frost has passed in individual 9cm pots and growing on a well-lit windowsill or in a heated greenhouse.
If pruned and transferred into a warm setting, some petunias, primarily trailing kinds, can be retained during the winter. If you don’t have much room, root cuttings in the late summer, pot them up separately, and store them indoors on a ledge for the winter.
Growing petunias: problem solving
Given the proper growing conditions and maintenance, petunias are often trouble-free. Young leaves and stems may develop aphid infestations; you may prevent this by checking your plants frequently and manually eradicating any tiny infestations. To control aphids, there are a variety of ready-to-use sprays available.
Snails and slugs can be an issue, especially for petunias that are rooted in the ground. Before putting petunias outside, grow them to a good size because larger plants are far more equipped to survive attack. Use an eco-friendly bait or surround plants with absorbent granules or barriers.
Petunias can be grown in Georgia.
My flower garden this year featured Mexican petunia for the first time. Should I bring it inside for the winter or can I leave it outside? Email from David Franklin
A: The Mexican petunia, Ruellia simplex, should thrive in the Atlanta region’s outdoor conditions. North Georgia, however, could not be winter-resistant. In the late summer and early fall, the blue blossoms are lovely. After the first frost, the stems will die back to the ground. Instead of leaving a bare spot for the winter, I plant iris, hardy amaryllis, and daffodils to add color. Be warned that if not contained, the common “tall ruellia” can become somewhat invasive. It will expand out a few feet each year if you put it at one end of a sizable flower garden. Every May, remove undesirable shoots by digging. Many improved and shorter ruellia varieties are now on the market, including “ChiChi” and “Purple Showers,” which may be less cold resistant than tall ruellia.
How should a 3-year-old gardenia plant be protected from the winter weather? Would it help if I wrapped it in burlap and left it there till spring? Roswell’s Rick Mente
A: Unless overnight lows drop into the teens, gardenias often don’t need to be protected. However, some kinds are unquestionably more resilient than others. According to legend, “Daisy” and “Kleim’s Hardy” are more cold-resistant than others. Although ‘August Beauty’ has more gorgeous flowers, it is a little less cold-tolerant. Purchase some floating row cover, sometimes referred to as frost fabric, if you decide to shield your plant from the elements. When overnight low temperatures are anticipated, completely enclose the plant, securing the edges with stones or firewood. Until the weather improves, leave the covering in place. Avoid keeping your shrub covered all winter.
A: We adored seeing beach roses in Maine while on vacation. They had a lovely scent. These roses could they grow here? S. Joni, Marietta
A: I’ll wager that you saw rugosa roses. The surface of the leaves is distinctively corrugated. They would thrive growing anyplace in the state’s northern half. Disease rarely affects them, and in the winter, colorful seed pods are present. They only bloom once a year, and they tend to be huge and gangly, so I believe that’s why we don’t often see them in neighborhood gardens. Rugosa roses are worth planting if you have the area.
A: Outside, I have two young rosemary bushes. During the winter, should I pot them up and bring them inside? Email from Rossee McLellan
No, you don’t need to bring rosemary indoors. One of the toughest herbs you can grow is this one. Oregano and thyme have also worked well for me in the outdoors. They were unharmed during the previous two winters. They are both close to a wall that offered some protection. At bit.ly/UGAherb, the University of Georgia offers a fantastic online guide to cultivating herbs.
In Georgia, when may I plant flowers?
It’s a fantastic time to plan your gardening and landscaping projects for the upcoming months since the new year has just begun. Find out what to plant when in your Atlanta garden by reading on.
- January: Although January is primarily about upkeep and preparation, you can add some color to your flower beds by planting pansies or English daisies at the end of the month if the weather is more agreeable. Mid-January is the best time to sow leafy greens, broccoli, cabbage, radishes, and turnips if you want to grow veggies.
- February: Plant sweet peas now to enjoy their lovely scent afterwards. Winter daphne can also produce magnificent, scented blossoms. If planted now, vegetables like English peas, onions, and garlic should flourish by spring.
- April: Plant peppers and tomatoes as the earth is starting to warm up. Plant Easter lilies to bring in spring; they will subsequently be pleasing to the eyes and nose. Plant seeds for flowers like zinnias and cosmos towards the end of the month so you can enjoy their benefits in the early summer. Gladiolus and dahlias should also grow well if planted this month.
- May: Begonias and petunias will provide even more color to your garden, giving you access to it all summer long. Love using fresh herbs in cooking or on top of salads? Planting rosemary, basil, oregano, and dill should be done right away. This month, grow more vegetables—beans, peas, squash, to name a few—to expand your menu possibilities.
- June: In June, focus on crop maintenance and enjoyment. Your early plants ought to be producing veggies and lovely flowers by this point. Verify the mulching of your gardens and look for illnesses like brown patch and dollar spot in your grass. Give your lawn a minimum of one inch of water per week.
- August: Though it’s still hot outside, it’s already time to consider planting for the fall. Sternbergia and fall crocus can be planted in August.
- Plant cool-weather crops like broccoli, collards, and cabbage for your fall garden before the middle of the month. In addition, now is an excellent time to grow trees and bushes because the weather will soon turn chilly.
- November: You still have time to plant spring bulbs if you didn’t get around to it in October. Daffodils and tulips are excellent choices. Due to the moderate soil in November, planting shrubs and trees is also a great option.
- December: Be sure to water your newly planted plants and shrubs and get your grass ready for the upcoming dip in temperature. To preserve your plants from the changing seasons, bring some of them indoors. Plant woody vines like wisteria and Carolina jessamine this month for the winter.
While maintaining a lovely garden and lawn requires work, you’ll be rewarded with an abundance of vibrant, fragrant flowers, delectable vegetables, and a lovely Atlanta lawn to enjoy all year long.