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What to grow with lilacs is a question that pops up for every gardener who plants these fragrant spring shrubs.
The best companions for lilacs are plants that share their love for full sun, well-drained soil, and a neutral to slightly alkaline pH.
You want to choose flowers and shrubs that bloom either at the same time or fill in the gaps after lilacs finish flowering.
In this post, we’ll explore the top choices for what to grow with lilacs, from perennials to bulbs, and share design tips that make your garden shine.
Let’s dive into the perfect partners for your lilacs.
What to Grow With Lilacs – The Best Companion Plants
When you’re deciding what to grow with lilacs, start with plants that thrive in similar conditions.
These companions will not only survive but also enhance the beauty of your lilacs.
1. Peonies
Peonies are a classic choice for what to grow with lilacs because they bloom right after lilacs fade.
Their large, lush flowers in pink, white, or red create a seamless transition in the garden.
Both plants prefer full sun and well-drained soil, so they are natural partners.
Plus, peonies add a burst of fragrance that complements the lilac’s sweet scent.
2. Catmint (Nepeta)
Catmint is another excellent option for planting with lilacs.
Its soft blue-purple flowers and silvery foliage contrast beautifully with the lilac’s bold blooms.
Catmint also blooms for a long time, often reblooming after deadheading, which extends the visual interest.
It loves sun and dry conditions, just like lilacs, so it’s a low-maintenance companion.
3. Alliums
Alliums, or ornamental onions, are perfect for what to grow with lilacs if you want architectural interest.
Their globe-shaped purple flowers rise on tall stems and bloom at the same time as late-season lilacs.
Alliums also repel deer and rodents, protecting your lilacs from unwanted nibblers.
They thrive in full sun and well-drained soil, making them an easy addition.
4. Baptisia (False Indigo)
Baptisia is a tough perennial that pairs wonderfully with lilacs.
Its spikes of blue, purple, or yellow flowers appear in late spring, overlapping with the end of lilac bloom.
The foliage stays attractive all season, providing a nice backdrop for later flowers.
Baptisia also fixes nitrogen in the soil, which can benefit your lilacs over time.
5. Lavender
Lavender is a sun-loving herb that shares the same growing conditions as lilacs.
Its purple spikes and silvery leaves create a Mediterranean feel that contrasts with the lilac’s old-fashioned charm.
Lavender blooms in early summer, just after lilacs, and its fragrance blends beautifully.
Just make sure both get excellent drainage, as lavender hates wet feet.
6. Irises
Bearded irises are another top contender for what to grow with lilacs.
Their tall, colorful blooms rise above the lilac’s rounded form, adding vertical interest.
Irises come in a wide range of colors, from deep purples to bright yellows, so you can match or contrast with your lilac variety.
They prefer similar sun and soil, but need dividing every few years to stay vigorous.
Considerations When Choosing What to Grow With Lilacs
Not every plant makes a good companion for lilacs, even if it looks pretty.
Keep these factors in mind to ensure your garden thrives.
Bloom Time
Lilacs typically bloom for only two to three weeks in late spring.
When deciding what to grow with lilacs, choose plants that bloom before, during, or after that window.
Early spring bulbs like daffodils and tulips can start the show, while peonies and catmint carry it through summer.
This way your garden stays colorful for months.
Soil pH and Drainage
Lilacs prefer neutral to slightly alkaline soil (pH 6.5–7.0) and good drainage.
If you’re planting with lilacs, avoid acid-loving plants like rhododendrons or azaleas.
Instead, choose plants that also like a higher pH, such as clematis, dianthus, and Russian sage.
Adding lime to your soil can help maintain the right balance for both lilacs and their companions.
Sunlight Needs
Lilacs need at least six hours of direct sun daily to bloom well.
What to grow with lilacs should also be sun-loving plants.
Shade-tolerant flowers like hostas or ferns will struggle under the lilac’s canopy and may not bloom.
Stick with full-sun perennials for the best results.
Root Competition
Lilacs have shallow, fibrous roots that spread out near the surface.
When deciding what to grow with lilacs, avoid deep-rooted trees or aggressive spreaders that will steal water and nutrients.
Good companions have moderate root systems and don’t mind a little competition.
Mulching around your lilacs helps retain moisture and reduce weed pressure.
Design Tips for Growing With Lilacs
Once you know what to grow with lilacs, think about how to arrange them for maximum visual impact.
Layer by Height
Place taller plants like baptisia or alliums behind or beside the lilac, and shorter ones like catmint or lavender in front.
This creates a natural, flowing border that draws the eye.
Lilacs themselves can be pruned into a small tree or kept as a shrub, so adjust your layering accordingly.
Color Harmony
Most lilacs are purple, pink, or white.
What to grow with lilacs in terms of color can be complementary or contrasting.
Purple lilacs pair well with yellow flowers like coreopsis or daylilies for a vibrant look.
White lilacs look stunning next to blue catmint or deep purple alliums.
Don’t forget to include some greenery for texture, like ferns or ornamental grasses.
Extend the Season
After lilacs bloom, their green leaves remain attractive but can look plain.
Plant late-summer bloomers like coneflowers, black-eyed Susans, or phlox to fill the void.
These plants are also sun-loving and fit well with what to grow with lilacs.
Their bright colors will keep your garden lively through fall.
So, What to Grow With Lilacs?
What to grow with lilacs is a matter of matching plants that share similar sun, soil, and water needs while offering complementary bloom times and colors.
Peonies, catmint, alliums, baptisia, lavender, and irises are all fantastic options that will thrive alongside your lilacs.
Remember to consider bloom time, soil pH, and root competition to avoid problems.
With a little planning, you can create a garden that celebrates your lilacs from spring through summer.
Happy planting, and enjoy the fragrant beauty your lilacs and their companions bring.