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Common Lilac, French Lilac 'Monore'

Syringa vulgaris

Family: Oleaceae (oh-lee-AY-see-ee) (Info)
Genus: Syringa (si-RING-gah) (Info)
Species: vulgaris (vul-GAIR-iss) (Info)
Cultivar: Monore
Additional cultivar information:(PP6877; aka Blue Skies)
Hybridized by Moore
Registered or introduced: 1987



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


8-10 ft. (2.4-3 m)


10-12 ft. (3-3.6 m)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:

Full Sun



Bloom Color:


Bloom Time:

Late Spring/Early Summer




Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Patent expired

Propagation Methods:

From softwood cuttings

From seed; stratify if sowing indoors

From seed; sow indoors before last frost

By grafting

By air layering

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:

Jay, Florida

Mathiston, Mississippi

Elephant Butte, New Mexico

Oneonta, New York

Elizabeth City, North Carolina

Raleigh, North Carolina

Staunton, Virginia

show all

Gardeners' Notes:


On Mar 28, 2015, coriaceous from ROSLINDALE, MA wrote:

Common/French lilacs require substantial winter dormancy and do not bloom reliably south of Z6.

"Blue Skies"/'Monore' was hybridized by the legendary rose breeder Ralph Moore in Visalia, CA, Z9a, and is recommended for planting in southern CA. It would also be worth testing in Z8 and Z9 in the southeastern US.

I seriously doubt that this lilac is S. vulgaris---it is likely some sort of hybrid. And I suspect that its fragrance is not the same.


On Apr 24, 2009, Joan from Belfield, ND (Zone 4a) wrote:

Editor's Note

Plant Patent number 6877 has expired


On Apr 12, 2008, TomH3787 from Raleigh, NC (Zone 7b) wrote:

A good lilac for the South - needs only a short chill period to set buds. Allegedly good through zone 9 but that might be pushing it. I am in 7b/8a and it does great for me.


On Sep 3, 2007, goofybulb from (Zone 5b) wrote:

As I am not a Florida native, I always missed the plants from back home. Just as SantaRosaGal said, I wished to have a lilac in my garden. And, after 5 years of being in Miami, I decided to get one. The lilac that I bought in June from Home Depot On-Line Store arrived in beautiful condition, just like taken from my grandmothers garden. Though it was recommended for at most zone 9, not 10, I dared to have one, since it said it doesn't need the frost and coldness to survive, and that it has some resistance to heat and humidity.
I planted it in a big pot (tenants syndrome, probably) in potting mix with slow-release fertilizer. My lilac never flowered (I guess it was already past the season anyway, and, as others tried to make excuses for their plants, "maybe it was too young"...... read more


On May 20, 2007, SantaRosaGal from Jay, FL wrote:

8b northern NW FL. Purchased Lilac Blue Skies from an online nursery in October. It arrived as a 1 foot tall plant with leaves intact. I planted it in a sand-mixed soil and have mulched around the base. This spring I added lime. I has grown new leaves but did not bloom this spring. I anticipate it will bloom once it matures. It is tolerating the heat so far. This plant was developed by Monrovia Nurseries in California and is said that it is ideal for southern climates in that it does not require a dormant season. I have been wanting a lilac for my Florida Garden for a long time and am not "giving up hope". Will keep you posted. SantaRosaGal


I am pleased to announce that early this spring (March 2008) this lilac has really leafed-out ... read more


On Jun 7, 2004, spaceman_spiff from Saint Petersburg, FL (Zone 9b) wrote:

Ordered a one-gallon-sized plant a few months ago, and it seems to be doing well in my front garden (with full sun from mid-day forward). Hasn't bloomed yet, but I think it's not big enough yet. Ordered it from a nursery in the Carolinas, which stated that it "needs no winter chill to set bud and flower reliably season after season in the south." This variety was zoned for as far south as zone 9. I live in St. Petersburg, Florida, and am hoping this variety will be successful here. I know of no one else in this area with lilacs growing here.

5/15/2005: Update: Well, apparently this part of Florida is not suited for lilacs. My plant described above slowly gave up and died by the end of the summer. I left the bare plant in the ground through winter and spring,... read more