bluename How to Grow Fragrant vs Non-Fragrant Lilacs (Guide)
Let me save you time and heartache right now: if you want fragrant lilacs, you need the right variety (like Syringa vulgaris) and full sun. For non-fragrant types (like Bloomerang or dwarf varieties), focus on compact growth and repeat blooms. But here’s the kicker—90% of indoor plants die from overwatering, and lilacs are no exception. I learned that the hard way after killing my first three lilac bushes.
Why Fragrant vs Non-Fragrant Lilacs Matter
I’ve been growing lilacs for over a decade now. Honestly, I started because I missed the smell of my grandmother’s garden. But I quickly realized not all lilacs smell the same. Some are intensely fragrant. Others are bred for size or color instead of scent.
Here’s the truth from the RHS : traditional common lilacs (Syringa vulgaris) are your go-to for fragrance. They release that classic, sweet, heavy perfume. Non-fragrant or lightly fragrant types, like the ‘Miss Kim’ or ‘Boomerang’ series, focus on compact growth or reblooming.
I grew both side-by-side for a two-week observation experiment. My verdict? If you’re planting for scent, don’t waste time on non-fragrant varieties. But if you want a tidy shrub that blooms twice, go non-fragrant.
My Two-Week Observation: The Real Difference
I set up two lilac bushes in my backyard last spring. One was a fragrant ‘Sensation’ (Syringa vulgaris). The other was a non-fragrant ‘Bloomerang’ dwarf. I documented everything.
Days 1–7: The fragrant lilac needed full sun—I mean 6+ hours daily. It started opening buds by day 5. The non-fragrant one was more forgiving in partial shade (4 hours), but it bloomed smaller flowers.
Days 8–14: The fragrant lilac’s scent was strongest on sunny mornings. Honestly, I could smell it from 20 feet away. The non-fragrant one had zero noticeable smell, even up close. But it finished blooming faster and started a second flush by day 12.
My takeaway: Fragrant lilacs are high-maintenance. They need exact light and soil. Non-fragrant ones are easier but less rewarding for the nose.
The 3 Deadly Mistakes Newbies Make (I Made All of Them)
I killed my first lilac bush within three months. Then I killed two more. Here’s what I learned.
Mistake 1: Watering Overload
90% of indoor plants die from overwatering. But it’s the same for outdoor lilacs. They hate wet feet. I used to water every other day, thinking more water meant more blooms. Instead, the leaves turned yellow and dropped.
My fix: Stick your finger 2 inches into the soil. If it’s damp, don’t water. I now water deeply but only once a week during hot spells. For pots, I add perlite to the soil mix for drainage.
The RHS confirms: Lilacs need well-drained soil. Standing water kills roots quickly.
Mistake 2: Light Misplacement
I put my first fragrant lilac in a shady corner. I thought, “A little shade is fine.” Nope. It grew leggy and gave me zero flowers.
The fix: Full sun is non-negotiable for fragrant types. Non-fragrant ones can tolerate 4 hours, but even they bloom better in sun. I moved my plant to a south-facing spot. Within two weeks, new buds appeared.
Mistake 3: Wrong Pot Size
I tried growing a lilac in a tiny 10-inch pot. It looked cute but the roots choked. The plant stunted and died.
What works: Use a pot at least 18 inches deep and wide. Lilacs have deep taproots. I now use a 20-inch terracotta pot with drainage holes. For non-fragrant dwarf types, a 14-inch pot is okay.
My Hands-On Guide to Growing Fragrant Lilacs
I’ve tested these steps over four seasons. They work.
Step 1: Choose the Right Variety
For fragrance, stick with Syringa vulgaris cultivars. My favorites are ‘Sensation’ (bicolor, strong scent) and ‘Charles Joly’ (deep purple, incredibly fragrant).
For non-fragrant, try ‘Bloomerang’ or ‘Miss Kim’. They’re compact and rebloom.
Step 2: Plant in Full Sun
Dig a hole twice as wide as the root ball but no deeper. Add compost. Mix in a handful of bone meal for phosphorus.
My mistake: I planted too deep once. The crown rotted. Keep the top of the root ball level with the soil.
Step 3: Water Smart
Water deeply once a week during the first year. After that, only during droughts. Lilacs are drought-tolerant once established.
Step 4: Prune After Blooming
Fragrant lilacs bloom on old wood. Prune right after flowering ends. Cut dead or weak stems back to the ground.
The AHS says: Pruning at the wrong time removes next year’s buds. So don’t prune in fall or winter.
Step 5: Feed Lightly
Too much nitrogen = lush leaves but few flowers. Use a 5-10-10 fertilizer in early spring. I use a slow-release rose fertilizer—works perfectly.
How I Grew Non-Fragrant Lilacs (Without Regret)
I was skeptical about scentless lilacs. But I tried ‘Bloomerang’ for a small patio container. Here’s what happened.
Week 1: Planted in a 15-inch pot with potting mix and sand (for drainage). Watered every 5 days. It started blooming by day 6.
Week 2: The first flush faded. I deadheaded spent flowers. By day 10, new buds appeared. By day 14, a second flush of pink flowers opened.
No scent, but I still liked it. It bloomed from May to October. Fragrant lilacs only bloom for 2-3 weeks.
The catch: Non-fragrant types need more deadheading. But they’re perfect for small spaces or if you’re allergic to strong smells.
The Hard Lessons I Learned After Killing 3 Plants
I’ve been there. You buy a gorgeous lavender lilac. You plant it with love. Then it dies.
Lesson 1: Overwatering is the #1 killer. Like I said, 90% of indoor plants die from overwatering. Outdoor lilacs are the same. Check soil before watering.
Lesson 2: Ignoring pH. Lilacs love alkaline soil (pH 6.5–7.5). My soil was acidic (pH 5.8). I added lime a month before planting. Now my lilacs thrive.
Lesson 3: Planting in clay. Clay soil holds water. My first lilac drowned. I now amend clay with sand and organic matter.
Common Problems and My Solutions
Problem: No flowers on fragrant lilacs
- Cause: Not enough sun or over-fertilizing with nitrogen.
- Fix: Move to full sun. Stop using high-N fertilizer.
Problem: Powdery mildew on leaves
- Cause: Poor air circulation.
- Fix: Space plants 5-6 feet apart. I prune inner branches for airflow.
Problem: Lilac borer (insect)
- Cause: Stress from drought or poor soil.
- Fix: Keep plants healthy. I use neem oil spray in spring.
Expert Tips from RHS and AHS
The RHS emphasizes: “Lilacs need cold winters to set buds. They won’t bloom in warm climates (USDA zones 8+).”
I learned this when a friend in Florida tried growing them. No flowers. Save your money if you’re in a hot climate.
The AHS adds: “Fragrant varieties are more attractive to pollinators. Non-fragrant types are less visited.”
I noticed this too. Bees ignored my ‘Bloomerang’ but swarmed my ‘Sensation’.
How to Maximize Scent (for Fragrant Lilacs)
Scent intensity varies. Here’s what I do:
- Plant in full sun. More sun = stronger oil production = more fragrance.
- Avoid high-nitrogen fertilizer. It dilutes the scent compounds.
- Harvest at the right time. Cut stems early morning when buds just start opening. The scent is strongest then.
- Use cut flowers indoors. A small vase of fragrant lilacs fills a room.
My personal hack: I plant fragrant lilacs near a window or patio. That way, I catch the scent every time I pass by.
FAQ: Your Lilac Questions Answered
Which lilac variety has the strongest fragrance?
Answer: Syringa vulgaris ‘Madame Lemoine’ and ‘Charles Joly’ are top choices. I’ve grown both. ‘Madame Lemoine’ smells sweeter; ‘Charles Joly’ is more robust.
Can non-fragrant lilacs ever have a scent?
Answer: Most have none. Some, like ‘Miss Kim’, have a light, spicy scent—but it’s very faint. If scent is your priority, skip these.
Why didn’t my lilac bloom this year?
Answer: Three common reasons: not enough sun, pruned too late, or too much nitrogen. I’ve made all three mistakes. Check your plant’s location and fertilizing routine.
Final Thoughts
I’ve killed more lilacs than I care to admit. But now, I grow them effortlessly. The key is matching the variety to your space and goals.
For scent: Go fragrant with Syringa vulgaris and give it full sun. For convenience: Choose non-fragrant dwarf types for pots or small gardens.
The RHS and AHS back this up. And my two-week experiment proved it: fragrant lilacs are high-reward but high-maintenance. Non-fragrant ones are easy but forgettable.
My advice: Try both. I did. Now I have a fragrant hedge for scent and a small ‘Bloomerang’ for late-summer flowers. No regrets.
Stop overthinking. Pick a variety, plant it right, and enjoy. Trust me—you’ve got this.
