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Growing Clock Vine (Thunbergia)

February 21, 2006
Botanical Name: Thunbergia alata
Life Cycle: Annual, tropical tender perennial
Planting Time: spring or summer
Height: 5' to 6'
Exposure: full sun to light afternoon shade
Soil: nutrient rich, moist soil
Hardiness: 9-11
Bloom Time: summer to mid fall
Flower: yellow and white
Foliage: green
Propagation: seeds or cuttings
Suggested Use: arbors, trellises, walls, fences and hanging baskets
Growing Hints: Start seed indoors 6 to 8 weeks before last frost or transplant seedlings 6 inches apart after night temperatures have reached at least 50º. Seedlings grow slowly, reaching 5 to 6 feet high with good supports. Vines flower poorly during high heat and humidity, but come back after the peak of summer heat subsides.
Interesting Facts: There are nearly 100 different species of Thunbergia-both shrubs and vines. Species are native to Africa and India, where flowers on some species grow to several feet in length.
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Questions

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I have a beautiful black eyed Susan vine. It has stopped blooming. What have I done? I water it and make sure it gets afternoon shade. I have been removing seeds as they appear. Should I be doing something else?

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August 3, 20181 found this helpful
Best Answer

They do well in and outdoors but either way, they seem to do better with some support, like a trellis. It seems to promote flowering...at least it did when I had them. They also like warmer temps at night so if you have them in a pot, bring them in on cooler nights. I am unusual in that I avoid fertilizer in 99% of my plants. I feel like it is overkill and too much fuss. Below is a nice link about these lovelies!

wimastergardener.org/.../

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August 3, 20181 found this helpful
Best Answer

You should trim it back a bit to help promote new growth. Normally plants don't need to be fertilized each month or watered daily. let it go one or two days between watering.

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August 6, 20181 found this helpful
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You may be doing everything right but maybe a little too much of each thing...

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  • You do not say if your plant is in the ground or if it is in a container but it is assumed you have it planted outside.
  • Here are some suggestions from lovers of Black Eyed Susan vines:
  • Not flowering generally is a watering problem, mostly overwatering. Watch your watering. If you want to maximize your blooms try Bloom Booster by Miracle-Gro and follow directions carefully.
  • Mulching around the base of the plants will keep the roots cool and moist, without fear of rotting.
  • Feeding every 4 - 6 weeks, with a complete fertilizer, to keep it growing strong.
  • Too much nitrogen can cause plants to produce more foliage and less blooms.
  • Black-eyed Susan vine does go through a period in the dead of summer heat (late-July and August) when it tends to slow down on producing blooms.
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    As soon as cooler weather starts back up again in September it should start to bloom again in force.
  • www.thespruce.com/black-eyed-susan-vine-thunbergia...
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October 8, 2014

Which season or month can I grow thunbergia to catch the flowering season?

By F Namanyane

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Photos

Share on ThriftyFunCheck out these photos. Click at right to share your own photo in this page.

January 21, 2011

I wish I was out watering my flowers. Looking at the 5 inches of snow on the ground today, takes me back to the warm summer day that I took this photo.

A Black-eyed Susan vine growing up a patio railing.

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