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PlantFiles: Bengal Clock Vine, White Sky Vine
Thunbergia grandiflora 'Alba'

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

5 vendors have this plant for sale.

11 members have or want this plant for trade.

Vines and Climbers

12-15 ft. (3.6-4.7 m)
15-20 ft. (4.7-6 m)
20-30 ft. (6-9 m)
30-40 ft. (9-12 m)

Unknown - Tell us

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:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Bright Yellow
White/Near White

Bloom Time:
Late Summer/Early Fall

Grown for foliage

Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

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:
From softwood cuttings
From semi-hardwood cuttings

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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By trax
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There are a total of 9 photos.
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3 positives
2 neutrals
No negatives

Gardeners' Notes:

Neutral FlaFlower On Aug 19, 2012, FlaFlower from Miami Dade, FL (Zone 11) wrote:

I don't know what trax is talking about as far as trendrils...I have never seen a trendril on mine, and no one else has mentioned a tendril on theres. It is a thick twiner and the stems can be relentles, a true contender to keep in place since it will travel to great legthes before appearing above ground. I keep hacking off the ones that show up at the base and pull them back threw, sometimes it's 3-4 foot away before it comes up. When you grab hold of the base where it is growing from it's like a pencil size strong white rope. Thank goodness I catch it before it roots along the way.

Positive Alileo On Sep 30, 2010, Alileo from Manila
Philippines wrote:

Thunbergia grandiflora, both blue and white varieties, are extremely invasive here in the Philippines. Its main trunk can grow up to 4in diameter and more, and will smother nearby trees given the chance. It does not produce seed (at least I have not seen any), but I have propagated it with cuttings taken from the numerous stolons, which can be quite vigorous under moist soil conditions. It can take heavy pruning; it blooms all year round, producing many drooping strands of flowers resembling Phalaenopsis flowers in size, color and texture, that attract lots of bumblebees; if you have a pergola in the middle of the garden, far from the house and trees, it's really worth a try.

Neutral htop On Dec 1, 2007, htop from San Antonio, TX (Zone 8b) wrote:

I have not grown this plant. It is naturalized in Florida, Hawaii and puerto Rico. In tropical rain forest regions, it is considered to be very invasive. It spreads vegetatively by stolons and is dispersed often by stem and tuber pieces being carried by water. It also produces seed pods which contain four seeds. The seeds are catapulted several meters when the pod splits. The vines in these regions smother out other vegetation.

Positive trax On Jul 2, 2007, trax from Merritt Island, FL (Zone 9b) wrote:

Plant grows extremely fast, very nice white flowers. Tendrils will reach out about 3 or 4 feet looking for something else to grow on so you need to watch out for other nearby trees. Easy to clip back when needed. Browns up in cold weather but snaps back fairly quick. I believe a freeze would cause it to die back to the roots. Leaves are somewhat larger than the Blue Sky variety.

Positive seedpicker_TX On Jun 19, 2007, seedpicker_TX from (Taylor) Plano, TX (Zone 8a) wrote:

Large white flowers with yellow throat. Leaves are large, broad, and shaped similar to ivy leaves.
Foliage is pubescent. Twines counterclockwise.


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

Jacksonville, Florida
Merritt Island, Florida
Titusville, Florida
Kurtistown, Hawaii
Houston, Texas
Plano, Texas

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