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PlantFiles: Bengal Clock Vine, Blue Sky Vine
Thunbergia grandiflora 'Variegata'

Family: Acanthaceae (ah-kanth-AY-see-ee) (Info)
Genus: Thunbergia (thun-BER-jee-uh) (Info)
Species: grandiflora (gran-dih-FLOR-uh) (Info)
Cultivar: Variegata

3 vendors have this plant for sale.

11 members have or want this plant for trade.

Tropicals and Tender Perennials
Vines and Climbers

15-20 ft. (4.7-6 m)

15-18 in. (38-45 cm)

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)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Light Blue
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From leaf cuttings
From herbaceous stem cuttings

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

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5 positives
No neutrals
No negatives

Gardeners' Notes:

Positive jtockosz On Mar 23, 2014, jtockosz from Belleview, FL wrote:

I started my Bengal Clock Vine from a clipping a friend gave me. I cut it into 3 pieces and all 3 pieces rooted very quickly. The larger piece grew to 3 ft. tall in a few months in a small pot and now I just planted all 3 next to my arbor. The large piece has multiple blooms ready to open. Yesterday, a beautiful large flower opened and another beside it was ready in a day or two. I went out this evening and caught a squirrel eating my flower and the blooms ready to open! Any suggestions on how to stop these critters from eating the blooms? I was so disappointed.

Positive ChloeErnie On Dec 9, 2012, ChloeErnie from El Lago, TX wrote:

My purple flowering vine seems to be a Bengal Clock vine, aka Blue Sky vine. - thunbergia grandiflors, however mine has a plain green leaf, not a variegated leaf. The leaves are around 5" long, pointed at the bottom and heart shaped at the top, same shape as in the photos. It 20' tall. Is this a Bengal Clock vine with plain leaves? It is growing in Seabrook, TX.

Positive jnc On Aug 7, 2005, jnc from Sumter, SC wrote:

I bought my Sky Vine at Lowes here in Sumter, S.C. It grew to at least 20 feet the first year , covering a built on trellis across the front porch . It was beautiful ! Cars would stop to look at it . I've not seen another one here . I went back to Lowes to see if they could order another one but they couldn't seem to get any more in . I'm still trying to root some pieces for family members but so far , I've only had one piece to root . Mine died back in the Winter but came back in the Spring . It gets the afternoon sun and only shade in the morning . I think it's a great vine , very showy and easy to grow , as long as you maintain the new shoots that appear every day !

Positive Turtle_35206 On Jun 16, 2005, Turtle_35206 from Cordele, GA wrote:

I don't grow this, yet...but have watched it on a trellis here for the past five years. It seems to be quite hardy in zone 8A. It is growing in full sun with no shade and seems to bloom from mid June until hard frost.

Positive trois On Mar 9, 2005, trois from Santa Fe, TX (Zone 9b) wrote:

We purchased this plant about 2 weeks ago. It had several pale blue flowers at the time. It has started growing and the newest blooms are decidedly darker blue that the ones that opened last week. I wonder if they fade to light blue or if the trend will continue.


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

Glendale, Arizona
Fallbrook, California
Laguna Beach, California
San Jose, California
San Leandro, California
Belleview, Florida
Englewood, Florida
Jupiter, Florida
Mulberry, Florida
Niceville, Florida
Ocala, Florida
Ocoee, Florida
Orange Park, Florida
Sarasota, Florida
Seville, Florida
Cordele, Georgia
Baton Rouge, Louisiana (2 reports)
Sumter, South Carolina
Belton, Texas
Humble, Texas
Santa Fe, Texas
Seabrook, Texas
Spring, Texas

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