We received a text message from a listener in area code 651 asking, “What would cause lilacs to bloom in September?”
When mild fall weather arrives following a cool down or after a strenuous summer, lilacs and other spring blooming plants may occasionally be persuaded to rebloom.
There may be fewer blossoms the next spring if you do have fall blooms.
My lilac is blooming in October—why?
MINNEAPOLIS, October 7, 2019 (WCCO). WCCO viewers are witnessing flowers that don’t often blossom in the fall, despite the fact that it is autumn.
Jodie brought in a picture of lilacs blooming in New Prague, and Bill put in a picture of them in Circle Pines. Therefore, people are curious as to why plants are flowering in October. A good query.
Julie Ackerman noticed one of her lilac shrubs outside of her Circle Pines house was in bloom about a week ago.
Ackerman remarked, “It was the first time we had come here in 18 years. “I guessed they might have believed it to be spring once more.
Julie Weisenhorn, an associate extension professor in the University of Minnesota’s Department of Horticulture, received the image from WCCO. Although some lilac bushes do bloom again in the late summer, she claimed that these blooms are more likely the result of Minnesota’s recent weather patterns.
Weisenhorn claimed that the varying temperature was what caused the plants to bloom. “We’ve had higher temperatures, but we’ve also had cool temps.
She claimed to have observed azaleas blooming in the fall, but not lilacs. The plants that blossom in the spring establish their buds a few weeks after the flowering period. Typically, the weather causes them to bloom a year later.
According to Weisenhorn, it is actually a hormonal reaction to the temperature and light of the environment. Weisenhorn speculates that the blooms may have mistaken the fall for spring due to the cooler late summer and warmer September.
Ackerman questioned whether a recent treatment for the lawn could have caused the fall blossoms. Theresa Rooney, a Hennepin County Extension Master Gardener, contends that this is most likely not the case.
“The environmental stress is more likely,” Rooney added. Rooney said that since every plant is unique, it makes sense that only one plant in a row of several might blossom. Some people are weaker or more stressed than others.
Weisenhorn said there’s a chance more plants could grow in the area as Minnesota’s weather patterns continue to shift.
She said, “We could.
Since so many variables are shifting and fluctuating, we can’t say for sure. However, she advises people not to be alarmed if their lilacs bloom in the autumn. The plant will be fine even if they most likely won’t rebloom that spring.
On WCCO 4 News at 10 and WCCO Mid-Morning, Heather Brown enjoys using her inquisitiveness to help you with your Good Questions.
What might induce lilac blooming in the autumn?
Late in September, Andrew Goldman went to his parents’ New Jersey home and found something odd: their crab apple tree was in bloom. The tree normally blooms in April, according to Goldman, a Rhode Island resident who works with edible plants. He can’t recall the house ever blooming in the fall before in the 20 years his family has lived there.
Cash reasoned that the unusual behavior of her tree was caused by the dry weather. Indeed, plants can blossom at unusual times of the year when they are under drought stress.
Overall, areas with drier late summers this year did have a large portion of this unique fall blossoming. The USA National Phenology Network gathers, preserves, and disseminates data regarding the timing of biological occurrences in plants and animals, such as the emergence of new leaves and migration. Director Theresa Crimmins claims that this year, compared to all other data collection years going back to 2010, the network got more reports of open flowers on lilacs and apples in September and October of 2020. The Midwest and Northeast contributed the majority of such reports. However, reports of out-of-season blossoming from North Carolina, which had a wet summer, were also reported on ISeeChange.
Plants are under higher stress as a result of the increased frequency of heatwaves, droughts, and downpours brought on by climate change. Plants may blossom more in the fall and have fewer buds open in the spring as a result of that stress. And to protect their plants, gardeners might need to exercise additional caution.
Drought may trigger out-of-season blooming
Many trees and shrubs, like lilacs and apples, that bloom in the early spring develop their buds in the summer before. The plant’s hibernation is broken in the spring when the buds expand and bloom.
But occasionally, plants bloom when they shouldn’t. In his 45 years of apple observation, Mark Longstroth, a fruit educator with Michigan State University Extension, has occasionally observed fall flowering. The northern U.S. is where this phenomenon is most prevalent. Longstroth cites drought as the primary cause.
According to the U.S. Drought Monitor, conditions in Ohio and New Jersey—the states where Cash and Goldman’s crab apple trees are located—were exceptionally dry in July and the beginning of August. Longstroth hypothesizes that stress in early August may have a special role in triggering extraordinary fall blooms.
Although the exact process by which dryness might trigger flowering is unknown, some research points to a connection with stress-induced dormancy, which helps plants conserve energy, similar to what they go through in the winter.
“Eike Ludeling, a researcher at the Institute of Crop Sciences and Resource Conservation at the University of Bonn in Germany, explained that according to our current understanding, the process of overcoming winter dormancy is also related to stress, and possibly summer drought is able to elicit a similar response.
It’s possible that as the climate changes, the conditions considered to cause stress-induced blooming—dry, hot, late summers—will occur more frequently. According to climate projections, there will be less precipitation across the Midwest and Northern Plains during the summer. And higher and more intense heat waves are anticipated to impair plants’ ability to retain moisture and increase evaporation.
According to Longstroth, fall flowering shouldn’t be a major concern in regions with adequate precipitation. “Although plants can be quite sensitive to environmental cues, he noted that we rarely see crab apples or apples produced in the South blossom twice.
Some fall blooms aren’t actually abnormal
ISeeChange posts from central North Carolina this year also documented cherry trees and azaleas blooming, as well as several traditionally summer-blooming plants flowering in late November, in addition to the out-of-season blooming that was seen in the Midwest and Northeast this year.
The director of horticulture at Durham, North Carolina’s Sarah P. Duke Gardens, Robert Mottern III, stated that he did not consider the azaleas’ flowering to be out of the ordinary. Every October, he added, “We see azaleas occasionally bloom.
The increased popularity of the Encore Azalea variety, which blooms all during the growing season, is one reason for this, according to Mottern.
Cherry trees sometimes bloom in the fall, according to Dan Stern, the horticultural director of the North Carolina Botanical Garden in Chapel Hill. When our first true cold snap is followed by a warm spell, cherry trees frequently bloom, according to Stern.
Plants may bloom outside of their normal season on occasion due to exceptional environmental conditions.
At the botanical garden, an atamasco lily was in bloom, according to Stern. According to him, the cause of the problem is likely a mix of temperature changes and the impact of a neighboring light in our parking lot.
Will fall blooms reduce harvests?
Drought can lead plants like lilacs and apples to bloom in the fall, which prevents those buds from blooming in the spring. Out-of-season blossoming could lessen the appeal of spring gardens and potentially harm yields, depending on how many buds open early.
Fall blossoms are often not a problem for apples because growers thin down the fruits anyway, according to Longstroth. Fall blooms, however, mean fewer berries to enjoy the next year for crops like blueberries, where producers want every bud to progress to a fruit.
People may need to assist their gardens and crops in adapting if fall flowering starts to pose an issue in home gardens or for farmers. One choice is to give delicate plants extra water, especially in the late summer. In order to help trees better retain moisture and control soil temperature throughout the hot and dry summer, Goldman said he advises mulching around trees.
“Goldman advised against leaving leaf bags out on the curb. He suggested, instead, covering tree bases with leaves. ” Regardless of what we are able to accomplish on a big scale in terms of climate change prevention, certain things are now inevitable, thus it’s critical to discuss how we will adapt to them.
Is lilac blooming in the fall typical?
Q. I recently saw a photo of a lilac that was allegedly in bloom this fall on the news. Is it still feasible for lilacs to bloom at this time of year?
A. It is feasible, yes. Occasionally, after a challenging summer is followed by milder weather, spring-flowering trees and shrubs will show one or two flowers. Before their typical spring bloom time, these plants set their flower buds in the summer. Some flower buds may emerge in the fall if the weather is unusual or harsh. The plants won’t suffer, they’ll just have a few fewer spring blossoms. I came across a Callery pear in full bloom in October of one year. The following year, I came back to discover the plant fully leafed out.
A branch from my rose bush was recently broken off by someone. In light of the impending winter, should I take any precautions to protect the plant?
A. Pull out the bypass pruners, which have two razor-sharp blades. Make a cut immediately above a leaf or the spot where a leaf was formerly linked to the surviving stem below the point where the branch broke. Clean cuts heal more rapidly and lessen the possibility of pests and pathogens getting inside the plant. Check the area where the branch was once linked to the plant if they completely broke it off. Remove only the loose bark. Avoid cutting into the stem and rubbing pruning paint on it. Once we have a week or longer of subfreezing temps, give your regular winter care.
A Christmas cactus I own is about to blossom. Can I split it up because it’s getting too big?
A. Take pleasure in the blossoms and refrain from pruning or dividing the plant until late spring, when it will transition to active growth. To promote more compact development, it is safest to trim back the longer branches. Use a sharp knife to cut off a handful of the portions from each stem. These pieces can be rooted to create new plants. You can divide plants that are growing in a single pot. But be aware that your plant’s health will likely suffer as a result of this great stress. Wait until the plants are actively growing and after flowering if you desire to divide the individual plants. Plants should be divided with care and replanted in a similar potting soil. Put each plant in a drainage-holed container that is just a bit bigger than the remaining rootball.
What truly eliminates creeping Charlie in the grass? I’ve tried a lot of different products, all to no avail.
A. It is important to address this query once more because it is typical. If you and your neighbors don’t like the flowers and aroma this hardy groundcover offers, there is a control alternative. The University of Wisconsin-Madison discovered that timing was the key to taming this plant. When the creeping Charlie is fully bloomed or following a hard freeze, spray a broadleaf weedkiller designed for use in lawns. Remember that when the existing plants are killed, there remain numerous seeds in the ground that will sprout and thrive. It will take several years to completely eradicate this weed. Spot treating will help you use fewer chemicals. Effective weed killers with dicamba and banvel are damaging on trees and shrubs.
Are lilacs supposed to bloom twice a year?
Bloomerang lilac trees are more compact than other lilacs, growing to a small stature of 4-6 feet tall with a 4-6 foot spread, giving them a pleasant, round shape. Their long, arched branches bear their veined leaves, which are deep green for the majority of the year before turning yellow in the fall.
The characteristic 4-petaled, 4-6 inch deep lilac-purple blooms on bloomerang lilac trees appear starting in May, cease blooming in June, and then return in July through the first frost of the year.
Specifications
With tall, arched branches, a compact and rounded shape, and rich green foliage that turn golden in the fall. Four spread petals, 4-6 inch, lilac-purple flowers that bloom in the spring and later in the summer.
What color is a lilac shrub in the fall?
The dwarf Korean lilac bush will reach a height of 4 to 5 feet (1.5 meters), which is smaller than that of other lilac varieties. These kinds of “Small gardens benefit from having a petite lilac bush.
The miniature lilac blooms for about two weeks in late spring or early summer, like other lilacs do. The flowers are clusters of tiny, light-pink petals that have a lovely scent. The leaves’ rusty-brown color in the fall might offer some “adding fall hues to your garden.
How does climate change impact lilacs?
Lilacs are well-known for their potent scent and exquisite hues, which draw hummingbirds, butterflies, and tourists.
According to a recent study headed by doctoral student Stephanie Nummer at the University of Toledo, climate change has caused North American lilacs’ initial bloom dates to advance by around one day every three years since 1973.
Lilacs in North America have been flowering on average one day earlier every three years since 1973, according to new research from The University of Toledo that demonstrates the consequences of climate change started as early as the 1970s.
According to a study conducted by Stephanie Nummer, a doctoral student at the University of Toledo, and published in the journal Springer-Nature Applied Sciences, North American lilacs regularly blossomed on or around May 15 of each year before 1973. First bloom dates have shifted forward by around one day every three years since 1973.
The new finding doubles the predicted rate of change that was determined by a study that was done roughly ten years ago using a different methodology.
The earliest bloom dates of North American lilacs are another long-term pattern that responds to the shift in world average temperature brought on by the increase in greenhouse gases, said Nummer. They are similar to the cherry blossoms in Washington, D.C. “We opted to experiment with lilacs since they are an excellent springtime indication and have been observed for more than 50 years.
The researchers used information from 53 locations in the United States and Canada that had records of the earliest bloom and leaf dates for the common lilac Syringa vulgaris going back at least 30 years.
The intriguing aspect of our methodology is that it enables us to ascertain both the pace and date of change for each specific lilac station as well as the overall average for all of North America, according to Nummer. ” As a result, we can use lilac phenology as a sign of springtime changes.
The South Cow Mountain Recreation Area in the Californian Mayacamas Mountains, which was altered first, dates to around 1964.
The last plant known to start the effects of climate change was a lilac found in Minnesota, close to Grand Rapids, about 1976.
The data set’s closest station to UToledo is in Wooster, Ohio, which lies southwest of Akron. Every four years, this station revealed a movement of around one day earlier, indicating that spring was moving earlier in the year. This phenomenon began around the beginning of 1974.
The typical bloom date before the transition point in 1974 was around day 126, or roughly May 6.
Although the average lilac tree blooming day sooner every three years is hardly perceptible, Dr. Song Qian, associate professor at the UToledo Department of Environmental Sciences and Nummer’s faculty advisor, said that the development is a sign of a wider change in the environment.
Similar shifts in the length of ice cover in the five Great Lakes and the timing of some North American songbirds’ spring migration are also revealed by Nummer’s PhD research.
We may begin to understand the possible effects of climate change on agriculture, fisheries, and the overall economy through these three indicators, according to Qian.
By combining them, we can gain a clearer idea of the consequences of climate change. Stephanie’s innovative approach prevents underestimating the scope of the effect.
Lilacs will continue to blossom, but another element might end up initiating the flower, according to Nummer, who notes that the study doesn’t go into detail about the mechanisms that are altering within the lilacs as a result of the warmer temperatures.
Temperature is a significant component, but sunshine exposure also has a significant impact, according to Nummer. Temperature is not an issue in regions where the temperature is consistently warm enough for blooms. In these places, sunlight acts as the primary catalyst for flowering. So lilacs will continue to bloom, but we expect that some regions may get warm enough for sunlight to start acting as the primary trigger rather than temperature.