Mexican petunias can bring beauty to your garden if you take care to select cultivars that are not invasive and that you can keep up with and manage.
blue-purple petunias? Mexican petunias may initially be mistaken for regular garden flowers.
Ruelliasimplex, a fast-growing perennial with green to purple stems and green leaves, are what Mexican petunias are in reality. This plant’s invasive, wild version is so aggressive that some states have prohibited it, while others have put it on a watch list of invasive plants. Mexican petunias are categorized as “extremely invasive” by the state of Florida.
Ruellia simplex, also known as R. tweediana, R. brittoniana, R. coerulea, and R. malacosperma, is a plant native to Mexico and western South America that can withstand freezing temperatures in USDA hardiness zones 8 to 11. Even though the plants were given their correct name by a German botanist in 1879, most horticulturists today call them R. tweediana. Mexican bluebell, hardy petunia, wild petunia, Britton’s wild petunia, and perennial petunia are examples of common names.
Mexican petunias may thrive in a variety of environments but prefer moist or marshy soils, such as those found at the edges of ponds and lakes or in moist woods. In dry soils, they can endure drought and even full sun.
The plants’ colorful, spectacular blossoms are fleeting, yet they bloom for a long time, starting in early spring and lasting until frost. The shrubs have an approximate width of one foot and a height of one to four feet.
Most of these lovely, hardy plants have the unfortunate drawback of spreading out of control and displacing good plants.
Invasive Mexican petunias develop thick, horizontal roots that extend above and below the surface of the earth, making them challenging to uproot. Even small portions that are missed can reseed. When ripe, seed capsules on the plants open and release seeds all over the place. Years after the plants have been eliminated, the seeds may still be present in the soil and begin to grow.
Even worse, when the seeds are moist, a mucous-like goo forms. They adhere like glue to dry soil once they are dropped there.
Mexican petunia varieties that gardeners can enjoy and cultivate responsibly have been developed by breeders. Because they are sterile cultivars, “Mayan Purple” and “Mayan White” do not produce seeds that self-sow.
‘Mayan White’
Mexican petunias are invasive, however “Mayan White” and its relative “Mayan Purple” are sterile substitutes.
Home Depot locations in Florida presently carry “Mayan Purple” and “Mayan White.” By 2014, the breeder, Rosanna Freyre, hopes to have the cultivars more widely accessible. This may involve cooperating with a North Carolina mail order business and a Georgia company with statewide distribution.
Another possibility is “Katie.” Due to its lovely blossoms and simplicity of maintenance, Texas A&M University has named this less aggressive, dwarf Ruellia a Texas Superstar.
‘Katie’ has blooms that are purple, pink, or white and grows to a height of about 6 inches. However, because it is fertile and spreads through seed, researchers from the University of Florida and the Institute of Food and Agricultural Services do not advise using it.
How can you prevent the proliferation of Mexican petunias?
A yard or garden bed can be swiftly overrun by Mexican petunias. Several measures can be taken to prevent Mexican petunias from encroaching in other places.
To slow down and restrict the spread of the plant, bury wood planks approximately six inches thick around it.
A larger Mexican petunia should be planted in a pot and placed in an established garden. Before the plant needs to be repotted, the roots will expand within the pot and let it to blossom wonderfully for years.
The plant will be forced to develop as a ground cover without encroaching on other parts of the garden if it is placed in a walled area far from other plants.
Mexican petunia seeds can disperse, so if you find a sprout in a spot where you don’t want the plant to grow, pull it out as soon as you can to prevent it from setting roots and creating a problem.
From Cuttings
You can increase the number of plants in your yard, for instance, by taking cuttings in the spring.
Cut a healthy-looking stem four to six inches from the end, just below a node, with a clean, sharp blade. Remove the bloom and any leaves that are close to the stem’s base.
Perlite and peat moss should be prepared in a clean four-inch pot and moistened. With a pencil, dig a two-inch-deep hole in the potting soil.
Place the cutting into the hole you produced in the potting soil after dipping the cut end of it in a powdered rooting hormone.
Keep your potted cuttings moist and in bright, indirect light. You can transplant them outside once the roots have taken.
Division
To divide this plant, aerate the surrounding soil and then excavate the desired clump.
Lift the clump out, then use a shovel to cut the plant’s crown into many pieces.
Put your transplants into holes that are twice as broad and the same depth as the root balls of your clumps. In the holes, distribute the roots widely.
When the roots are well-established, keep watering them well for many weeks after covering them with earth and watering them well.
How quickly does the Mexican petunia grow?
Mexican petunia, also known as desert petunia, quickly takes root when you start with a seedling or young plant that has been produced in a nursery. Typically, clusters of 3 foot tall, sturdy, semi-woody stalks bearing lovely leaves and blooming within a month or two are produced. The plant’s first season typically features purple flowers that bloom from mid-spring until late-fall. Placing the plant in full light will encourage quick, healthy growth and an abundance of blossoms. This will also encourage the development of flower buds and keep the leaves a deep, rich green.
Mexican petunias: are they weeds?
Maintaining a lawn and garden might seem like a never-ending list of difficult chores, especially if you’re having trouble with invasive species. One of those bothersome little plants that toes the line between being a lovely ornamental and a really terrible weed is the ruellia, often known as Mexican petunia. They may be defeated in the home landscape, but doing so requires a lot of patience.
Do you need to reduce your Mexican petunias?
Typically, a Mexican petunia only needs one annual pruning in late winter or early spring to remove any damaged, weak, or unwelcome stems back to the plant’s root system. During the flowering season, trimming spent flower stalks helps keep the garden looking tidy. Every few years, in the spring, trim Mexican petunia clumps back to a few inches above the ground to revitalize them.
The spread of this plant can be controlled with specific pruning methods. Cut off any spent Mexican petunia blooms before they set seed and pluck away any stems that have fallen to the ground and become rooted in the soil.
Do Mexican petunias appeal to hummingbirds?
Our friend gave us some unidentified seeds about three years ago. They came from a “dark green plant with blue blossoms that resembled crepe paper. They were positioned by our garage in a garden nook. We quickly developed a dark green shrub with serrated leaves that eventually produced beautiful blue tubular blooms. It refroze during the winter and then reemerged in the spring. AND it spread, but we discovered that the tiny self-seeded plants were simple to remove.
Without success, I tried to identify this plant. I thoroughly read the Sunset Western Garden Book, consulted other gardeners who visited our garden, and, in the end, gave up the search. Then, last week, when on a trip with the Vaca Valley Garden Club at High Hand Nursery in Loomis, I came across our plant. It is a Mexican petunia, or Ruellia brittoncana. The mysterious plant was finally identified and given a name.
Research revealed that this plant is native to Mexico and is simple to grow in either dry or moist soil. They are evergreen shrubs that reach heights of 3 feet and a width of 4 feet. There are a few dwarf kinds available, like “Katie,” which reaches a height of 10 inches. These plants produce flowers in a variety of blue, purple, or white hues with little care. The two plants are not related, despite the fact that they resemble the petunia bloom we are all familiar with. Because the plants’ vibrant blossoms draw butterflies and hummingbirds, many home gardeners grow them.
Due to its invasiveness, Ruellia is either adored or despised by gardeners. There is a sterile variety with deep purple flowers named “Purple Showers” that will not self-seed. Even though it won’t reseed, if cultivated in wet soil, it can spread by its roots. They are also known as desert petunias and grow more flowers the more sun they get. Mexican petunias can be propagated through division, seeds, or cuttings.
Once established, plants planted in the early spring will bloom all through the summer and into the fall. Although young plants require routine watering, the plant is sturdy enough to endure prolonged periods of dryness. They adapt quickly and thrive in containers as long as they get sunlight. The best news is that Ruellia brittoncana is very resilient to the majority of illnesses and pests.
Do Mexican petunias reappear annually?
I have an about 4-year-old Mexican petunia called a Ruellia. All of the stems died back in 2013 as a result of the freeze. The plant recovered well and produced lovely flowers after I clipped them all off at the ground level.
The plant appears to have seen very little dieback this winter. Should I remove every stem at ground level or just the ones that have been harmed by frost? Does it bloom from the old stems as well or just the new wood?
In response, Mexican petunia is categorized as a herbaceous perennial, meaning that if it gets too cold, it freezes to the ground and then grows back from the root. Since it blooms in the summer, the flowers appear on young growth. Older wood and the young growth at the bottom will both produce flowers.
It will grow from the root and bloom much like it did in 2014 if you prune it to the ground once more, as if it had frozen back. That is the simple method.
The second choice is to maintain it at this height while lowering everything weak or dead to the ground. The remaining stems should then be pruned back to the desired branching height. Shearing or cutting it back will make it grow more thickly and blossom above the sheared area.
Your plant will grow taller if you use the second strategy. Use the first approach if keeping it small is a need.
Do not forget to fertilize it right away with an all-purpose fertilizer for growing flowers, such as a fertilizer for roses, fruit trees, tomatoes, or something comparable.
The avocado I planted outside last year came from its pit. I put it in a pot and carried it inside when the weather started to become colder. The older leaves are starting to dry out and turn brown. Since bringing it inside, I fertilized it once. Every other day, I give it a gentle watering because the leaves are starting to curl from dehydration.
The primary cause of leaves falling from an avocado brought inside is a change in the duration or intensity of the light. Additionally, moving it from the soil to a container can promote leaf drop. A irrigation issue could be the reason for leaf fall. Insect pests like mites are a fourth potential.
Plants raised outside produce a distinct kind of leaf than those raised indoors. Sun leaves, which are leaves that are grown outdoors, fall off as the light intensity changes. A shade leaf is a new growth that the plant produces that is thinner, bigger, and more numerous.
Leaves can fall off due to root system disruption as well. It’s referred to as transplant shock. Additionally, a change in watering schedule might result in leaf drop. If there are mites on your indoor plants, they may have relocated to the avocado due to the fruit’s susceptibility to mite problems.
Ensure that the avocado receives as much light as you can. Ideally, a window facing south should be used. For it to remain healthy and avoid growing spindly, you must provide it with several hours of sunlight.
Until water is coming out the bottom of the container, moisten the soil inside. Wait to water again until you see a significant shift in the container’s weight. Using a pencil or a soil moisture meter is another way to determine the amount of moisture in the soil.
See how easily a pencil descends by pressing it into the ground. In dry dirt as opposed to moist earth, a pencil is more challenging to push. After removing the pencil, you can feel the end to gauge its moisture level. A soil moisture meter, which is readily accessible at any nursery or garden center, is another option.
Mites are a frequent issue with avocados. Slap a fading leaf against some white paper to check for mites. Under glaring light, they scrutinize the page.
You can observe tiny mites the size of a pencil dot crawling across the surface if you have good vision or are using a magnifying glass. If you softly drag your fingertips across the paper’s surface as well, the mites will leave a red stain.
If your plant has mites, you should apply horticultural oil all over it to suffocate the mites. Sprays of soap are effective at removing live mites.
Small snails have been climbing up my red brick planter this fall, I’ve noticed. Many of those shells are scattered over my yard and pots. In contrast to the past, powdery mildew has suddenly appeared on my roses. I believe that the snails are to blame for my lawn’s thinning. Older mulberries in my yard provide me with some shade. I emailed you some images of my backyard.
After looking at the photographs and reading your explanation, I believe that the shade is responsible for a number of issues. Plants and soil keep wet longer in areas of increased shadow.
Snails and slugs prefer prolonged wetness. The likelihood of developing powdery mildew and other illnesses rises with increased shade. Lawns narrow and finally collapse as a result of more shade.
Lower branches on the trees can be cut off to improve things. More light will enter your property as a result of limb removal, which will also boost the roses, lessen disease issues, thicken the lawn, and lessen snail issues.
Fescue and rye, two cool-season lawn grasses, require filtered sunshine or at least five hours of direct sunlight daily, with no more than 50% of the lawn being shaded. Lawns and floral plants will suffer if they are shaded more than this.
Lawns that are shaded cannot endure any type of traffic. In the more shady regions, the lawn will start to dwindle and the ground will become barren.
In the shade, flowering plants like roses produce fewer and of inferior quality blooms. The shade is ideal for powdery mildew. Water splashes are also enjoyed by powdery mildew. Powdery mildew will spread from rose to rose if there is overhead irrigation that splashes on the foliage and they are shaded.
Snails are challenging to manage. Use bait and traps to keep them under control. Put moist newspapers or cardboard between the plants to catch snails. Snails and slugs enjoy gatherings under damp paper or cardboard when the sun rises.
To dispose of them, gather them up from the ground or the underside of the cardboard and place them in a plastic bag. If you do this consistently, let’s say once a week, you can reduce their numbers.
Baits are also effective against snails. According to the label, they are normally distributed about the plants on a regular basis. These can be bought online or at the majority of nurseries and garden retailers.
I recently received a sizable bag of California-grown Fuyu persimmons that I had produced myself. Will the Fuyu persimmon tree endure the harsh climate in Las Vegas? The tree won’t even grow here.
The majority of persimmon varieties can grow in this environment. The variety known as “Hachiya” is one that I wouldn’t advise growing here, but Fuyu, gigantic Fuyu, coffee cake, and the majority of the others will provided they are planted correctly in enriched soil and not as a component of a desert landscape surrounded by rock mulch.
The fruit is of good quality, however because of our intense lighting, it could become sunburned.
The surface mulching of the trees with wood mulch is crucial. You should water them like you would any other landscaping plant, fertilize them once a year, and prune them similarly to how you would most other fruit trees.