Why Is My Lilac Bush Blooming In The Fall

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.

A lilac bush can blossom in the fall, right?


When Minnesotans head outside to take in the Fall oranges, yellows, and reds this week, they might be startled to find delicate purple hues mingling with them.

“According to Fred Struck, owner of Traverse des Sioux Garden Center in St. Peter, lilacs occasionally rebloom in September.

He stated that when something in nature prompts lilacs to emerge from hibernation, it does occur in our climate.

This year’s temperature and moisture levels deceived the plants into believing they experienced a brief period of winter.

On the breezes of this fall, the pleasant scent that permeates the air in the spring is hardly noticeable. Lilac branches with blooms are few and few between, and late bloomers have smaller flowers than those from spring buds.

Struck offered the following advise to owners of common lilac shrubs that are blooming this fall: “Embrace them. There is also no cause for concern. In the spring, they will bloom once more.

For at least one type, the Boomerang, bunches of fragrant lilacs are to be anticipated at this time of year, according to University of Minnesota Extension educator Shane Bugeja. The 2009-original reblooming hybrid blooms flowers intermittently over the course of many months.

This year’s growing season was stressful for the common lilac kinds that Minnesotans generally employ as garden hedges, according to Bugeja. This summer, numerous inquiries to his Mankato office came from locals who were alarmed that the leaves on their lilac plants were turning dark or dropping off.

“This year, there was a severe fungus outbreak that affected a large portion of Minnesota. The lilac bushes were not killed, but they were stressed. Stressed plants can bloom at strange times of the year.

He advised property owners with aged lilac hedges to think about removing stressed plants’ limbs.

“Pruning your lilacs in late February or early March is appropriate if you don’t care if they bloom next season.

Are lilacs supposed to bloom twice a year?

Compared to other lilac trees, bloomerang lilac trees are more compact, reaching a short height of 4-6 feet tall and a spread of 4-6 feet, giving them a pleasing, rounded appearance. Their long, arched branches bear their veined leaves, which are bright green for the majority of the year until 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.


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.

Which lilac varieties bloom in the fall?

Syringa meyeri ‘Palibin’ is a dense, compact, low-spreading, deciduous shrub that blooms profusely from late spring to early summer with erect panicles of lilac-pink solitary flowers. It is the perfect Korean Lilac for small gardens. Its broadly oval, deep green leaves are exceptionally resistant to powdery mildew and are nonetheless lovely in the summer despite being smaller than the species. In the fall, they transform into a lovely reddish bronze color, extending this exceptional lilac shrub’s season of fascination. among the lilacs with the slowest growth or most stunted size. Meyer Lilac is particularly tolerant of cities.

What should lilac bushes be used for in the fall?

Cutting off the tops of stems that have grown out of control is frequently insufficient when pruning lilacs. It is typically preferable to remove the entire stem. The best way to trim lilacs is with clippers. To avoid spreading and promote later blooms, remove spent blossoms right down to the stems. Three-quarters of the branches should be pruned. Remove any shoots that are emerging from the main trunk and are growing close to the ground. Lilacs within the inner branches may need to be trimmed in order to increase air flow or let more light through.

However, it may be essential to prune the entire bush or tree to approximately 6 or 8 inches (15-20 cm) above the ground if lilac shrubs are already too big or starting to look unpleasant. Remember that it takes around three years for flowers to grow after the entire bush has been removed, so you might have to wait.

Is it normal for my lilac tree to bloom in October?

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 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.

When ought to lilac bushes be pruned?

All lilacs should generally be clipped right away in the spring after they have finished blooming. Lilacs set their flower buds for the following year immediately after the current year’s flowers have faded, therefore trimming later in the summer or fall will result in the removal of most or all of the blossoms for the following year. The larger common lilacs as well as the shorter or more “shrub like” cultivars are all subject to this timing guideline. While the “when” of lilac trimming is rather simple, the “how” is a little more difficult. For the time being, we’ll refer to lilac pruning as either maintenance pruning or rejuvenation pruning to keep things simple.

Should lilacs be deadheaded?

Dwarf lilacs that resemble ordinary lilacs include the “Palibin” Meyer lilac (Syringa meyeri “Palibin”) and the “Miss Kim” Manchurian lilac (Syringa pubescens ssp. patula “Miss Kim”). However, they hardly ever need pruning for maintenance, though you can do it sometimes for shape. They can also profit from deadheading, just like other lilac kinds.

The act of manually removing withered blossoms from a plant is known as deadheading. This encourages some plants to continue blooming. But only during the first several years of growth does deadheading seem to make lilacs bloom more effectively.

Within two to five years, young lilac plants should start blooming. Deadheading the spent blooms when the plants are young encourages the plant to focus its energy on developing new buds. It won’t require this stimulation once the plant has grown older, and you’ll probably have so many flowers that the task would take too long.

Your lilac will blossom beautifully some years, and less so other years, just like with any plant. Blooms frequently rely on the climate. You will be rewarded with an abundance of blossoms the next year if you have a beautiful summer during which strong new growth emerges. Less flowers will bloom in a summer with harsh weather. Therefore, if your lilac’s color changes from one year to the next, don’t get alarmed. The blossoms will come as long as the plant is strong and you continue with maintenance pruning.

How frequently do lilac bushes bloom?

The late lilac is the leading contender for a long-lasting lilac that will bloom profusely throughout the warmer months of the year (Syringa villosa). As its name suggests, it blooms later than other types and produces fragrant white, pink, rosy lilac, violet, and even crimson blossoms. This lilac bush only has one summer bloom and enjoys direct sunlight.

Consider a reblooming lilac for your garden if you want consistent flowers. Lilacs that rebloom will first bloom in the spring, then rest until summertime when they will blossom once more. After their spring rest, certain types, such as the Bloomerang dark purple, will continue to bloom until the fall. Look for the Josee reblooming lilac (Syringa Josee), which intermittently flowers throughout the summer and into the fall, if you live in a warmer climate.

How can I make my lilac bush produce more flowers?

Lilacs often bloom quite consistently, although occasionally they don’t. To ensure that yours grows, follow these suggestions:

  • Usually, the issue is a lack of sunlight. Each day, the sun should be exposed for at least six hours.
  • Nitrogen in excess might be problematic. Lilacs are frequently cultivated in lawns, and nitrogen-rich fertilizers are utilized to make lawns greener. This results in lovely green foliage on the lilac but minimal blossom. Avoid using nitrogen-rich fertilizers.
  • Make sure to prune when the season is perfect. Remove any dead or damaged timber in the early spring. However, avoid performing any significant pruning because you can just remove the dormant flower buds. It’s acceptable to perform more significant trimming after the flowers have faded, such as reshaping or rejuvenating an elderly bush. The old flowers can be taken out as well. Just be sure you finish it before the middle of the summer. A few of the flowers from the upcoming season may be lost if you wait too late.

Visit the Lilac Planting and Care page for a comprehensive guide to lilac planting and care.

What caused my purple lilac to change to white?

Many flowering trees and shrubs begin as one hue and gradually lighten as they ripen, generally as a result of sun bleaching. It wouldn’t be that odd for them to turn whitish if yours initially had a light purple color. The climate would also have an effect as the flowers grew and opened.

Another possibility is that most decorative plants are rootstocks onto which top plants are grafted. Usually, a separate cultivar of the same species of rootstock is used. You will therefore obtain whatever flower color the rootstock has on that branch if it sprouts and sends branches up from below the graft. Simply cut it off at the base to get rid of it.

Are male and female flowers required for lilacs?

Abiotic and biotic methods are both used to pollinate lilacs. When a pollen sac travels from the stamen to the pistil with the help of an active pollinator, such as a bee, butterfly, or bird, this process is called biotic pollination. Abiotic transportation is made possible by the wind, the rain, or other natural occurrences. A pollen tube develops when the pollen sac touches the stigma of a female flower. The tube enters the ovary through the style. When a lilac plant has both male and female flowers, it can self-pollinate. It can also be cross-pollinated if there is another lilac bush nearby, which occurs when a pollen sac from one plant lands on the stigma of a flower from another plant.