These wonderful plants will fill your yard with delicious scent.
When the lilacs begin to blossom, it is a solid indicator that spring has arrived for good. While many people only have a limited knowledge of common lilac (also known as French lilac) shrubs that can reach a height of 15 feet or more, there are now a lot more options available than there were fifty years ago. Some varieties that rebloom enhance the garden’s appeal the entire growing season.
How to Choose Lilacs
The common lilac is what you will most likely find when you go plant shopping. This traditional plant comes in a variety of cultivars and variations, each of which yields fragrant spring flowers in pink, purple, white, or even combinations of those hues. Common lilacs are typically the most fragrant variety of lilac and can grow to be rangy and large.
Rebloomers have arrived in the garden center thanks to recent introductions of hybrids between the common lilac and other shrub-type lilacs. Some of these more recent types are a little less fragrant, but they also tend to be smaller, bloom more frequently throughout the growing season, and have fewer powdery mildew issues.
The tree lilac is another common variety of lilac. It can grow to a height of around 20 feet and blooms with cream-colored flowers in the middle of the summer. Though it doesn’t require much trimming, keep in mind that the tree lilac is a tree, not a shrub.
Where to Plant Lilacs
Lilacs should be planted in full light (at least 6 to 8 hours per day), as too much shadow will prevent them from blooming. Lilacs also prefer moist, well-drained soil that is slightly alkaline.
When to Plant Lilacs
Before the ground freezes in the late fall is the ideal time to plant lilacs. After the earth thaws in the early spring, that is the next ideal period to plant. Lilacs will likely need to be planted as soon as you can locate them at the garden center, which is great; if you choose to do so during a warmer season, they might require additional watering.
How to Prepare the Soil for Planting Lilacs
A soil test should be performed prior to planting since lilacs thrive in slightly alkaline (6.5 to 7.0 pH), moist, well-drained soil that is high in organic matter. Lime must be added to raise the pH if it is below 5.5. It’s time to get the soil ready when you’ve obtained the ideal pH. Improve individual planting holes by mixing Miracle-Gro Garden Soil for Trees & Shrubs in a 50:50 ratio with the natural soil to give lilacs a nutrient-rich start. Iron and phosphorus are also present in this garden soil to promote root development and ward off leaf fading.
Does half shade cause lilacs to bloom?
Question:
Three years after being planted, a lilac has never flowered. Is there anything I can do to help the lilac bloom?
Answer:
Common or French hybrid lilac (Syringa vulgaris) cultivars may take several years (five or more) after planting to blossom. Before the bushes can flower, they must develop and become mature. Lilacs flower as soon as feasible when a good planting location is chosen and good cultural methods are used during the establishment phase.
Soil and Light Requirements
Lilacs thrive in full light and well-drained soil. At least six hours a day of direct sunlight should be provided for plants. Lilacs won’t bloom well if they are placed in partial shade.
It’s also crucial to provide good care over the first two or three years. Around each shrub, spread a 2- to 3-inch layer of mulch to retain soil moisture and keep weeds at bay. During dry conditions, water lilacs frequently. Additionally, enclose lilac shrubs with wire fencing in the fall to keep rabbits away from the plants’ foliage.
Even though proper cultural practices will promote plant growth, some of them may actually prevent flowers from blooming.
Fertilize Lightly
Lilacs don’t typically require fertilization. Lilacs can, however, be sparingly fertilized in the early spring. Heavy fertilizing may hinder flowering and encourage excessive vegetative growth.
Pruning at the right time is key
Flowering can also be impacted by pruning. Lilacs flower on growth from the previous year. Lilacs should be pruned as soon as they finish blooming in the spring. Many of the flower buds on lilac trees may be lost during winter, fall, or late summer pruning.
The common lilac typically doesn’t bloom until several years after planting, but a few other lilacs do. Syringa meyeri, the dwarf Korean lilac, Syringa patula ‘Miss Kim,’ and Syringa x prestoniae, the Preston lilac, all bloom within one to two years of being planted.
How much sun do lilacs require?
The Middle East is the origin of lilacs, which can grow as either a tree or a shrub. They draw everyone’s attention with their profusion of fragrant flower clusters. Compared to shrubs, which are typically smaller and more compact, trees are more sensitive.
What lilacs need to flower properly
For lilacs to properly flower, they need full sunlight. They need to be grown in an area with six hours of daylight each day. Additionally, they dislike being planted close to other trees because this could stunt their growth. Due to their solitary nature, lilacs should ideally be kept two to three meters away from other trees and buildings. You must plant them where the earth drains well because they do not like to have moist roots. Additionally, it is advised to shield them from chilly winds.
Tips for the maintenance of lilacs
Lilacs typically need little upkeep and care. When should a lilac be planted if you plan to purchase one? Your new tree or shrub should be planted in the spring or the fall.
Lilacs prefer neutral or slightly alkaline soils. Early in the spring, fertilize using a phosphate and potassium-rich fertilizer. It is advised to prune your plant as soon as the flowering is over. Remove any old, diseased, or dead branches at the same time. Your lilac will flower more the next spring if you also remove any withered blooms.
Water your plant at least once a week while it’s extremely hot outside.
Lilacs are plagued by a number of severe ailments and parasites. The most prevalent ones are Spanish fly, powdery mildew, bacterial blight, and leafminers.
The difference between lilacs and buddleias
Did you know that lilacs and buddleias, commonly known as “butterfly bushes,” are frequently confused with one another? Buddleias are less tolerant of the cold than lilacs.
Lilacs take far longer to grow than buddleias, which can grow up to eight feet in a single season. Buddleias may grow in a variety of soil types, including poor and calcareous ones.
Buddleias flower from summer through fall, but lilacs often bloom in the middle of spring. Their fragrant, vivid, and colorful blossoms, as well as the fact that both plants draw butterflies, are what most distinguish them from one another.
Are lilacs sun or shade lovers?
Full light and well-drained soil are ideal for lilac growth. Lilacs won’t flower well if they are cultivated in partial sunlight or shade. The bushes can live for hundreds of years after they have established themselves in a new location, even if it may take them three to four years to do so. The plant’s growth may be impacted by the soil pH (alkalinity or acidity of the soil). A slightly acidic to alkaline soil is ideal for lilac growth. Because of their frequent high acidity, New England soils may need to be modified for the greatest lilac growth.
Pruning the blooming stem back to a set of leaves each year will stop seed formation and ensure that there will be an abundance of flowers. Good flowering years may be followed by terrible years if this is not done. Winter trimming will get rid of flower buds since they are generated in the summer before they blossom.
Branch out any diseased, damaged, or dead wood. Renewing pruning is necessary for tall, lanky, and poorly flowering plants; for three years, cut around one-third of the oldest stems at ground level each year. This promotes the development of strong new stems from the base. The plant should have fully recovered after three years, with flowers growing back to nose height.
Despite how resilient lilacs are, they nevertheless require plenty of water as they grow. Lilacs prefer soil that is both moist and well-draining.
Powdery mildew fungus (Microsphaera alni), lilac borer (Podosesia syringae), and scale are the most problematic lilac issues in our region (oyster-shell scale, Lepidosaphes ulmi and prunicola scale, Pseudaulacaspis prunicola). The leaves appear to have pale streaks of powdery mildew on them. Even though it is ugly, it is rarely severe in our environment. In stems and larger branches, often one to two feet above ground level, borers leave 1/8-inch holes. A modest infestation may be disregarded, but more than a few borers require professional diagnosis and treatment. While prunicola scale covers bark with a dusty white mass, oyster-shell scale is appropriately named since the pests resemble 1/8-inch oyster shells on the stems. Control adult scale by chopping off branches that are extensively infested; control microscopic baby “crawlers” with a strong hose spray of water (use a hand lens to see scale). Summer oil and dormant oil both work well.
Where shouldn’t lilac bushes be planted?
Avoid planting lilacs in areas that will receive more than a half-worth day’s of shade because they thrive in full sun. Make sure to give them room to expand when you plant them. To find out the mature plant’s height and spread, read the label on the plant.
Lilacs require sufficient drainage to thrive. The soil should have just enough moisture to support the root system while still allowing for free drainage after heavy rains.
Dig a hole that is about 8 inches in diameter and 12 inches deep to test the drainage before planting. Add water to the hole. Choose a different location if the water hasn’t drained after an hour.
Do lilacs tolerate shade?
Respected Master Gardener: I see the enormous, aromatic shrubs at my grandparents’ property when I think of lilacs. Are there any lilacs suitable for small gardens, as my yard is pretty little? Could lilacs survive in partial shade?
Lilacs, or Syringa, are excellent shrubs for cold locations because they require chilly winters to thrive. They flourish in direct sunlight for at least six hours each day. Even though they can survive some shade, they won’t blossom as much. There are some lesser types of lilacs that thrive in our region, but many of them grow to be fairly enormous.
Syringa-Fairytale Lilac Series plants are upright, rounded, and bloom mid- to late in the season. They are hardy to 35 degrees below zero, grow to a mature size of 5 feet tall and 4 feet wide, and have good disease resistance. Tinkerbelle is pink, Prince Charming is lavender-pink.
Hyacinth Lilacs, or Syringa x hyacinthiflora, mature to a size of about 10 feet by 10 feet, so they might grow too big for your garden. Nevertheless, they are quite attractive, bloom early in the season, and are hardy to 45 degrees below zero.
Syringa meyeri, also known as the Meyer or Dwarf Korean Lilac, has a mid- to late-season bloom, is hardy to 35 degrees below zero, and matures to a size of 7 feet by 8 feet. Palibin is a smaller cultivar, measuring about 5 feet by 7 feet. Despite being referred to as “Korean lilacs,” they are actually Chinese in origin.
The late-blooming Syringa x prestoniae (Preston or Nodding Lilac) is hardy to 40 degrees below zero. At 10 feet by 8 feet, Donald Wyman might be too enormous for your garden, while Coral and Hiawatha reach mature sizes of 7 feet by 6 feet and 8 feet by 6 feet, respectively. Hiawatha has exceptionally attractive magenta buds and is powdery mildew resistant.
Miss Kim, a variety of Syringa pubescens (Manchurian Lilac), is well known. It flowers late in the season and is hardy down to 35 below zero. Its mature dimensions are 6 feet tall by 6 feet wide. This species produces small, abundantly blooming blooms and is resistant to powdery mildew. The color of Miss Kim is lavender-blue.
The Common Lilac is Syringa vulgaris. This species has a wide range in size, is hardy down to 40 degrees below zero, typically blooms in the middle of the season, and frequently has a potent scent. Smaller varieties that thrive in our region include Albert F. Holden, a silvery purple that measures 8 feet by 7 feet, Avalanche, a white that measures 8 feet by 6 feet, Lucie Baltet, a pale pink that measures 5 feet by 5 feet, Marie Frances, a pink that measures 8 feet by 6 feet, Prairie Petite, a pink-lavender that measures 3 feet by 3 feet, Sarah Sands, a dark purple that measures 8 feet by 6 feet (lavender-blue, 6-feet by 5-feet).
Respected Master Gardener: Which perennials ought I remove right away, and which should I wait until spring?
Gardeners frequently want to trim back all herbaceous plants and straighten up the yard before the snow arrives, but some perennials shouldn’t be pruned at all because they support wildlife or add color and interest to the otherwise drab Minnesota environment throughout the winter. Heuchera, tiarella, dianthus, moss phlox, and hellebores are examples of low growing evergreen or semi-evergreen perennials that shouldn’t be clipped back.
For extra crown protection, leave the foliage on the following perennials until spring: Aster, Astilbe, Chrysanthemum, Delphinium (cut stems to basal foliage), Hosta, Lady’s Mantle, Penstemon (cut tall foliage to basal growth), Russian Sage, and Salvia (leave the foliage on until spring) (cut back to basal growth). You may maintain track of some perennials by keeping a section of them in place. Examples are Asclepias, Platycodon (balloon flower), and hardy Hibiscus. These perennials emerge late in the spring.
Some perennial plants have fascinating seed pods or flower heads that make the garden interesting in the winter. Flowers like Baptisia, Achillea, Sedum, and Joe Pye Weed can all be left in situ to add color to the garden in the late fall and winter. The plumes of various ornamental grasses, particularly feather reed grass, can enliven the winter environment with intrigue and vertical accents. Trim back grasses in the early spring before new growth appears to protect tender shoots.
Some perennials can be left until spring even if they may not be very appealing since their seed heads provide food for birds. These include Heliopsis, Rudbeckia (black-eyed Susan), Echinacea (coneflowers), Monarda (bee balm), and Coreopsis. If not deadheaded and left in place, some annuals, such as zinnias, bachelor’s buttons, and cosmos, also provide food for birds.
Hemerocallis (daylily), Brunnera, Bearded and Siberian Iris, Phlox (not moss phlox), and Veronica are perennials that you are free to remove right away. Cut down any unhealthy or contaminated plants you may have, and then get rid of the plant matter. After the foliage turns brown and collapses, herbaceous peonies can be pruned back to the ground. Be cautious not to disturb the reddish buds off to the sides, though, since they will grow stems the following spring.
Respected Master Gardener: My yews were practically reduced to skeletons last winter by something. They had a slight resurgence this summer, and I want to shield them from harm this winter. What do you suggest?
The culprits are probably rabbits and deer, both of which enjoy yew trees. Your best bet is usually to use repellents and limits together. You can use any commercial deer and rabbit repeller, but make sure it is labeled for those animals and is used in accordance with the directions. Applications will be required all winter long. Making circular cages out of hardware cloth or another type of fence material with mesh apertures no larger than one inch will restrict access. The cages must be four feet tall and large enough to be used as the plant develops. Secure cage bottoms that are buried many inches. They will be further shielded from winter winds and storms by two or three three-quarter-diameter metal or bamboo poles weaved vertically down the cages and buried in the ground. Other priceless and vulnerable shrubs can also be caged to keep animals out.
- Rakes, hoes, shovels, spades, and digging forks should all be clean. Cleanse with water after removing dried dirt with a brush. To avoid rust, wipe down tools with an oil-soaked rag after they have dried. Wooden tool handles can be moisturized and lubricated using the same rag.