Black Eyed Susan vine not blooming can make you think the plant is dying.
What is wrong with the plant or is there anything wrong with it at all? How do you get Black Eyed Susan vine to flower or do you simply have to let the vine be?
Read on for answers, causes, and remedies.
Why Is Your Black Eyed Susan Vine Not Blooming?
Black Eyed Susan vine (Thunbergia alata) is very picky when it comes to when and where it blooms. If you don’t provide it with the perfect conditions, it won’t bloom.
If your Black Eyed Susan vine stopped flowering, the most common cause is that the environment is too hot. Give the plant a cool, sunny environment and protect it from scorching heat.
There are other causes too, such as:
- poor soil
- no pruning
- too much fertilizer
Diseases and pests most often won’t affect a Black Eyed Susan vine’s blooming schedule. Don’t feel bad if your Black Eyed Susan vine doesn’t bloom. In most cases, it’s due to factors outside of your control.
How Often Can a Black Eyed Susan Vine Be Blooming?
The Black Eyed Susan vine can bloom constantly from May to first frost. This does not apply during the first year of its life, when the vine is sensitive to growing conditions. The vine will bloom when it feels like it, with your actions having little impact. After that, with some attention and care you should be able to make your vine bloom repeatedly throughout the warmest months of the year.
Do Black Eyed Susans Thrive in Any Climate?
No, there is no guarantee of blooming for this vine outside of USDA 9–12 zones. Provide the Black Eyed Susan vine with a condition closest to its native African climate. This means the vine needs a sunny and cool climate for the best flowering results.
The Effects of Hot Weather
Yes, hot weather can stop a Black Eyed Susan vine from blooming. If you notice your Black Eyed Susan vine not flowering, keep it in hot weather for six hours at most. The best time for exposure to hot weather is early in the morning. Give your Black Eyed Susan vine in shade during the day so it cools off, and it should start blooming.
The Effects of Cold Weather
Yes, low temperatures can stop a Black Eyed Susan vine from blooming. If the air or soil temperature drops below 60 F, the vine will likely not bloom.
Can Poor Soil Make a Black Eyed Susan Vine Not Bloom?
Yes, poor soil can be the cause of a Black Eyed Susan vine not blooming. Black Eyed Susan vine thrives in warm, moist, and well-drained soil. It should be sandy and slightly acidic, around 6 pH. Enrich the soil with compost and put 2–3 inches of organic mulch to help the soil stay moist.
Dry soil can also make the Black Eyed Susan vine stressed out. Check the soil the vine is growing in daily and make sure it’s not soggy or dry.
Can Pests Stop a Black Eyed Susan Vine Bloom?
No, pests cannot stop a Black Eyed Susan vine from blooming. This vine is resistant to pests, except nuisances: whiteflies and mites. They most often appear on indoor Black Eyed Susan vines. If you’re bothered by them, spray the vine with a mix of insecticidal soap and tap water.
Can Black Eyed Susan Vine Getting Black Leaves Stop It From Flowering?
Yes, black leaves can stop Black Eyed Susan vine flowering. If you notice the Black Eyed Susan vine having black leaves, the cause is a fungus in the soil. Replant the vine and avoid the soil because the fungus spreads through spores in the soil.
Can Pruning Make a Black Eyed Susan Vine Bloom?
Yes, pruning can make a Black Eyed Susan vine bloom. When the vine becomes too long, the flowers don’t get enough energy to bloom. By pruning the vines, you give the plant more energy to flower. But, the vine will decide on its own when it’s time to bloom.
First, disinfect shears or scissors with a 10 percent bleach solution or rubbing alcohol. Cut off dead flowers right below the petal base. Cut at an angle to promote faster healing.
You should also prune the vines until they’re 12 inches long. Do this early in the spring, before the first growth but after the winter chills. Do light pruning during the year to keep the vine under control. You can even prune the vine all the way to the ground; it will regrow the next year.
Can Putting a Black Eyed Susan Vine on a Trellis Help It Bloom?
Yes, using a trellis to support and stretch out a Black Eyed Susan vine can help it bloom. If your Black Eyed Susan vine stopped blooming, it might be because it’s got too little breathing space. Create a trellis using remesh, which is a concrete support wire. Remesh comes in sheets and is more affordable than other trellis materials.
Remesh is not galvanized and will later develop a rusty look to it. Use gloves if you’ll be cutting it yourself because the edges can be razor-sharp. The safest option is buying pre-made wooden frame trellises. You can also file down the sharp remesh spots or use a thicker wire.
Drive two tall stakes into the ground and tie the remesh to them. You can use zip ties or galvanized wires to tie the remesh to the stakes. Put the vine on the bottom part of the remesh and it will slowly climb up using tendrils. As your Black Eyed Susan vine climbs towards the sun, it will bloom more and in richer color.
Can a Lack of Light Stop the Black Eyed Susan Vine From Blooming?
Yes, lack of light can indeed stop the Black Eyed Susan vine from blooming. Provide your vine with sunlight for optimal growth but partial shade works too. You can even use grow lights to make the Susan vine bloom in a greenhouse.
Can Fertilizer Make a Black Eyed Susan Vine Not Bloom?
Yes, a fertilizer that gives too much nitrogen can stop blooming and promote leafing. Use a bloom-boosting fertilizer with plenty of phosphorus, such as 15-30-15. Avoid those with lots of nitrogen, often labeled on the fertilizer packaging as “urea.” If nothing seems to help, scale back on fertilizer use altogether.
You can also try using bone meal on your Black Eyed Susan vine to help it flower.
Should You Grow Your Black Eyed Susan Indoors?
There is no guarantee indoor growing of the Black Eyed Susan vine will make it bloom more often. For best results, use a 12-inch container with draining holes. If there aren’t any, drill them yourself. Fill it with general-purpose potting soil.
Can Talking or Singing to a Black Eyed Susan Make It Flower?
Yes, because talking and singing produce CO2 that enriches plants. When you exhale more CO2 at a Black Eyed Susan vine, it gets more energy for flowers. Of course, this is just a side effect of the singing, so do not expect music from a stereo to make your vine bloom!
Will Replanting a Black Eyed Susan Vine Make It Bloom?
There is no guarantee replanting will help a Black Eyed Susan vine flower. You can still try it by pressing one of the vines to the ground. Cover it with one inch of soil and within a few months it will sprout roots. Cut off the new vine from the parent and replant.
Can the Presence or Absence of Other Plants Make a Black Eyed Susan Vine Not Bloom?
There is no evidence a Black Eyed Susan vine blooms or doesn’t bloom because of other plants.
If you’d still like to try planting a companion to this vine, use one of these:
- White phlox (Phlox paniculata)
- Pearly everlasting (Anaphalis margaritacea)
- Flowering spurge (Euphorbia corollata)
- Hollyhock (Alcea rosea)
- Aster (Aster)
- Daylily (Hemerocallis lilioasphodelus)
- Butterfly weed (Asclepias tuberosa)
- Russian sage (Perovskia atriplicifolia)
- Ox-eye daisy (Leucanthemum vulgare)
- Stonecrop (Sedum acre)
- Purple coneflower (Echinacea purpurea)
- Clasping coneflower (Dracopis amplexicaulis)
- Lance-leaf coreopsis (Coreopsis lanceolata)
- Morning glory (Ipomoea purpurea)
- Purple hyacinth bean (Lablab purpurea)
Birds, Bees, or Butterflies: Are They the Cause of the Lack of Blooms?
There is no evidence any bird or insect will make a Black Eyed Susan vine not bloom. If you’re still in doubt, contact a local florist or horticulturalist for advice.
As you’ve seen, a Black Eyed Susan can be a great addition to your garden — however, it does need particular care if you want to enjoy its colorful flowers. In this article, you’ve learned that:
- Black Eyed Susan vine doesn’t bloom during its first year
- Black Eyed Susan vine needs a cool, sunny environment to bloom
- Too much fertilizer or nitrogen can stop a Black Eyed Susan vine from blooming
- Growing Black Eyed Susan vine on a trellis fosters blooming
Caring for a Black Eyed Susan vine means helping it feel at home. Let sunlight bathe it but also keep it cool for rich, colorful blooms. With a little bit of care, the Black Eyed Susan vine will delight you and the world.
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