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PlantFiles: Black-Eyed Susan Vine
Thunbergia alata 'Lemon Star'

Family: Acanthaceae (ah-kanth-AY-see-ee) (Info)
Genus: Thunbergia (thun-BER-jee-uh) (Info)
Species: alata (a-LAY-tuh) (Info)
Cultivar: Lemon Star
Additional cultivar information: (PP14371; Sunny series; aka Lemon A-Peel)

2 vendors have this plant for sale.

One member has or wants this plant for trade.

Vines and Climbers

6-8 ft. (1.8-2.4 m)

24-36 in. (60-90 cm)

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)

Sun Exposure:
Sun to Partial Shade


Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Blooms repeatedly

Grown for foliage

Other details:
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
Suitable for growing in containers

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 herbaceous stem cuttings
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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There are a total of 8 photos.
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2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive RxAngel On May 8, 2010, RxAngel from Stratford, TX (Zone 6b) wrote:

I have grown this in two different regions...Andover and Rolla, Kansas. It has gone bananas in both areas. Of course it is an annual in both of these regions, and I have not been successful in even finding seeds, much less propagate by seed. I also have not had luck rooting cuttings either, even with rooting hormone. Vigorous, fast-growing vine, yet not invasive (in this area, anyway) with tons of gorgeous yellow flowers that last all day long.

I have noticed while it does like to climb, it also will vigourously vine along the ground, and I believe if several were planted close together, this might make a gorgeous ground-cover, as long as you didn't have other plants or items you would mind covered with the upward growth.

It does well in this area with other vines, and does not tend to overtake them. I have had them planted with the Giant Moonflower (Andover) and with a Passion Flower vine (Rolla). It co-exists beautifully with both vines, and would probably be able to stand its ground with Morning Glory and 4 O'Clocks. I have another one for this year and will try growing with both Morning Glory & 4 O'Clock.

Positive TNPassiflora On May 25, 2005, TNPassiflora from Oliver Springs, TN (Zone 6b) wrote:

Of all the flowers I grew last year, this Black-Eyed Susan Vine was the most outstanding. It was easy to care for and spread quickly over the entire trellis and onto the roof over my carport. I grew it in a 14" diameter pot, in the sun, and watered frequently, though it can tolerate some dryness (just not for an extended period). It bloomed all summer and into the fall before dying in late October (I'm in Zone 6B).

I did note that the literature says it is a self-seeder, but my plant last year produced no seeds at all (I kept looking for them). Could it be that I had a male plant? Does anyone know about the reproduction of these vines? I would love to see a picture of the seeds/pod, if anyone has one.

I have started a new Susan Vine, in an apricot color, for this year, and it is taking off to a great start. Highly recommend this plant if you need a trellis covered quickly!


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

Tucson, Arizona
Bellflower, California
Elk Grove, California
Bartow, Florida
Port Saint Lucie, Florida
Atlanta, Georgia
Andover, Kansas
Rolla, Kansas
Malden, Massachusetts
Worcester, Massachusetts
Saginaw, Michigan
Traverse City, Michigan
Minneapolis, Minnesota
Ocean Springs, Mississippi
Hamlet, North Carolina
Barrington, Rhode Island
Conway, South Carolina
Ridgeville, South Carolina
Oliver Springs, Tennessee
Cypress, Texas
San Antonio, Texas

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