Hybrid Sweet Autumn Clematis, Sweet Autumn Virgin's Bower, Japanese Clematis 'Sweet Summer Love'


Family: Ranunculaceae (ra-nun-kew-LAY-see-ee) (Info)
Genus: Clematis (KLEM-uh-tiss) (Info)
Cultivar: Sweet Summer Love
Additional cultivar information:(PP24044)
Hybridized by Marczyski
Registered or introduced: 2012
» View all varieties of Clematis


Late Mixed


20-30 ft. (6-9 m)


9-12 in. (22-30 cm)


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)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Bloom Color:



Flower Fragrance:

Very Fragrant

Bloom Shape:


Bloom Diameter:

Small - less than 2 inches (5 cm)

Bloom Time:

Late Summer/Early Fall

Mid Fall

Sun Exposure:

Sun to Partial Shade

Other details:

May be a noxious weed or invasive


All parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Pruning Groups:

Group 3 - Summer/Fall bloomers; prune hard in early spring

Patent Information:


Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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

Umatilla, Florida

Gardeners' Notes:


On Jun 1, 2015, laurel1949 from surrey, bc,
Canada wrote:

I planted two Sweet Summer Love clematis about one month ago in South Surrey, British Columbia. (May 1, 2015). They are growing like weeds so far and climbing about 6 feet up my porch and on a fence--very full and dense. They are healthy and doing well and are super fast growers. I will report back when they start blooming. I am excited at their potential.
It is now July 18, 2015 and it is six weeks or so since I planted two Sweet Summer Love clematis. They climbed about 8 feet and are in bloom. They are lovely and charming with a light sweet scent. I love them. Next year will be a real show. I have had many clematis over the years and I believe this to be the most charming and non fussy clematis that I have ever had.


On Jul 3, 2014, coriaceous from ROSLINDALE, MA wrote:

Graham Rice says that it reaches 11 feet in height and blooms from early July to September, and that it's intensely fragrant. Flowers are just under 2", opening deep red and aging through purple to violet.

A new hybrid that first bloomed in 2007, bred by Szczepan Marczynski in Poland. He prefers not to reveal the parents and states only that it's related to C. flammula, commonly called virgin's bower. It should not be confused with sweet autumn clematis or Japanese clematis (C. terniflora, now called C. paniculata again), a rampant grower which can be invasive.

Clematis flammula is usually listed as only hardy to Z6. This hybrid is often listed as hardy only to Z5, and that seems likely based on parentage.

Patented. USPP 24044. Unauthorized pro... read more