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Hibiscus: Yellowing leaves are falling off on my hibiscus ...

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dreamjourney
San Diego, CA

June 6, 2011
9:39 PM

Post #8614408

Please help me diagnose the stress on my hibiscus.

The plant has been in the same 14" ceramic pot in the same spot for over a year now.
It gets enough sun from 11am to 6pm.
It gave me tons of flowers last summer.

By the end of February I pruned the plant by less than 1/3. Since then it set a lot of buds, and bloomed profusely, hundreds of flowers actually. I deadhead it diligently to keep the flowers blooming.

But starting from April, all the bigger leaves started yellowing and falling off, and all the new grown tiny leave also started to yellow and falling off.

About 3 weeks ago I gave it 3 in 1 systemic rose and flower granules didn't help. So maybe it is not spider mite or lack of nutrition.

Now the plant still gives a lot of bloom but the leaves are just getting less and less, Now, I am afraid I will lose all the leaves.

I attached a picture of the plant, taken 3 weeks ago, you can already see the yellow leaves.
Now it is worse.

What could it be?

Here is an article I found regarding yellowing leave on hibiscus, but I found nothing apply to my case.
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Hibiscus leaves turn yellow and drop from the plant due to stress. The stress can be of any type, and figuring out what kind of stress is the challenge for the gardener. We cannot tell you exactly what is wrong with the plant without knowing a lot more than you are likely to be able to tell us. YOU have to think about it, and when you are pretty sure you have determined the cause, then you can take action to relieve the stress on your hibiscus. This article is intended to help you figure it out what is wrong.

Stresses that can cause yellow leaves on hibiscus include:

1. Not Enough Water
In warm conditions hibiscus need a lot of water, even every day or more than once a day if it's really hot or windy. Self-watering pots can be an excellent way to avoid this type of stress. A watering system controlled by a timer is another way for gardens with large numbers of plants.

2. Too Much Water
Yes, hibiscus can also be given too much water when the weather is cool or overcast. Hibiscus like to be moist but not sopping wet and if they don't need the water due to cold or dark conditions then too much will stress the root system.

3. Too Hot
This is related to water but please take note on super hot summer days that hibiscus will need lots of water to keep all the big lush leaves well supplied. If they don't get enough they react by dropping leaves (that turn yellow first) so that they don't need as much water.

4. Too Cold
Hibiscus are tropical plants that thrive in the same temperatures that people like, 65-85F (18-29C). Like us, they will survive, but they will not like temperatures down to freezing and up to 110F (38C). If they get too cold or are placed in a cold drafty window, they can react with yellow leaves.

5. Too Much Direct Sunlight
Hibiscus like sunlight but just as most people like moderate amounts of it so do hibiscus. Too much sun places stress on hibiscus that are not used to it and they can react with yellow leaves or big white spots on leaves. The white spots are similar to sunburn on us. They won't kill the plant but will cause it to shed leaves.

6. Too Little Sunlight
Light is the source of life for plants such as hibiscus. If they do not get enough to support all the big lush leaves they will drop some of their leaves (which turn yellow first) so that they don't need to support so many. However, that means that there is less green chlorophyll left to support the needs of the rest of the plant so it may continue to decline until there are only a few leaves left on the plant.

7. Insects, Particularly Spider Mites
Spider mites are tiny spiders that look like little crabs under magnification. Usually you cannot see spider mites with the naked eye but do they ever leave a mark on hibiscus leaves! First you may see mottling of the leaves which begin to look dirty and then tired. The underside of leaves will show marks made when the mites suck the juices from the leaves. As the infestation gets worse you will see small spider webs under the leaves and at the top of stems. Leaves will yellow and fall off the plant and the entire plant will look stressed. If left untreated, spider mites can cause every leaf on the plant to fall. It takes hibiscus weeks to recover from a bad spider mite infestation so it is best to take action as soon as possible. Click here for complete information on identifying and treating Spider Mites.

8. Too Windy
Most of us do not realize the stress that wind places on plants. Wind dries them out and the result is yellow leaves.

9. Improper Nutrition or pH ~ Chlorosis
This is a different condition, called Chlorosis and the yellow is a different yellow. The leaves will remain partly green and partly yellow when there is a nutrition problem. Leaves almost always fall off the plant after turning solid yellow. If they do not turn completely yellow nor fall off, then it is likely that the problem is a lack of essential nutrients. This can be due to no fertilizer applied or due to a pH level of the soil that is too high or too low. The leaves do not turn a bright yellow all over if this is the case nor do they drop off. Such problems can be corrected by using fertilizer and/or amending the soil with substances that will neutralize the pH. Consult a nursery professional at a local garden center if this is the case. Click here for complete information on identifying and treating Chlorosis.

10. Pesticide Use
This is not a common problem but overuse of pesticide or using the wrong pesticide or too strong a pesticide or spraying in the hot sun of mid day can also cause leaf problems. If you have applied pesticide recently this may be the problem but if you used the same type at the same strength and done so in morning or evening then it is most likely one of the other stress problems above.

Once you have reviewed all the possible problems and decided on a likely source of the stress the cure is to remove the stress. Sometimes it is already done, as when you have watered thoroughly after neglecting to do so during a heat wave. There is no saving the yellow leaves that WILL fall off but the good news is that hibiscus will quickly grow back new green leaves when the stress is removed. Sometimes it becomes necessary to prune back a stem that has lost all of its leaves except for a few at the top. Pruning causes a cascade of plant growth hormones to enter the bare stem and stimulates new growth on the remaining part of the stem after pruning. This is a final solution if all else fails but it is best to remove the cause of stress first and to feed and water the plant well since that may be all it will take to get new growth on your hibiscus.

Yellow leaves are not the worst thing in the world. Sometimes the situation will correct itself, other times you need to correct the stressful condition. The hibiscus will do its part by reacting to the improved condition by no longer dropping leaves and often by regrowing new ones to replace any that were lost. Good luck with your growing and gardening and by all means have fun with it!

Thumbnail by dreamjourney
Click the image for an enlarged view.

dreamjourney
San Diego, CA

June 6, 2011
9:46 PM

Post #8614415

This is a picture earlier in March, the leaves are dark green and looks so healthy.

One more question, is hibiscus a ever green plant?

Thumbnail by dreamjourney
Click the image for an enlarged view.

ecrane3
Dublin, CA
(Zone 9a)

June 6, 2011
9:50 PM

Post #8614422

Unfortunately I can't see your yellow leaves very clearly. Are they totally yellow, or are the veins still green? Or is there a stippled pattern to the yellowing?

Green veins with the rest of the leaf turning yellowish would suggest chlorosis which you'll need to correct by fertilizing or fixing the pH of the soil in your container.

A stippled pattern would suggest spider mites (check the undersides of the leaves for little reddish brown dots).

Most likely though if the leaves are turning solid yellow, it's the typical finicky thing that they do sometimes. Mine do it when there are big swings in temperature (going from cool to hot or vice versa) or when I've watered inconsistently (let them dry out too much followed by a good soaking). In both those cases there's no permanent harm done. I don't see any wilting or other signs that would indicate it's a true watering issue (vs them just being a little finicky)

Lastly--yes, they are evergreen, but if you keep them outdoors year round and get temperatures that are too chilly they can drop their leaves and it doesn't necessarily mean that they've died, assuming it didn't get too cold they can still come back in the spring.
dreamjourney
San Diego, CA

June 7, 2011
6:53 AM

Post #8615052

Here is the picture of a yellow and fallen leave.

Thumbnail by dreamjourney
Click the image for an enlarged view.

dreamjourney
San Diego, CA

June 7, 2011
6:55 AM

Post #8615055

Here is another one still on the tree.

It is sad to see a beloved plant suffer :-(
But I garden to make me happy, but not to be worried. I would be so happy to see it recover!

Thumbnail by dreamjourney
Click the image for an enlarged view.

ecrane3
Dublin, CA
(Zone 9a)

June 7, 2011
7:06 AM

Post #8615080

In general it looks closest to the yellowing that I see with temperature swings or inconsistent watering. But I can see some stuff on the leaves which could be from some sort of insect pest so I'd give the plant a close inspection and maybe give the leaves a good hosing off.
dreamjourney
San Diego, CA

June 7, 2011
7:19 AM

Post #8615098

Hi, ecrane3, thanks for the quick reply. I will try to hose off the leaves.

blupit007
Clinton, CT
(Zone 6b)

June 7, 2011
3:31 PM

Post #8616113

Make sure you get the underside of each leaf with a good blast with the hose. That is where they chill out... They cant withstand the hose blast. Good luck!
dreamjourney
San Diego, CA

June 8, 2011
7:07 AM

Post #8617463

Hi, blupit007, Thanks for the tip. I will blast the bottom of the leaves.

Btw, can anyone identify the plant. I got it from HomeDepot, and on the tag it just said Hibiscus.
The other day I saw a 15ft tall tree with flowers like mine same shape and color but twice big flower, someone told me that was "San Diego Red". Mine is only 4 feet tall. Could it be a baby San Diego Red? Can I grow it in container?
ecrane3
Dublin, CA
(Zone 9a)

June 8, 2011
7:16 AM

Post #8617476

Yours may not be a particular cultivar--just a plain garden variety red one. There are also other cultivars with red flowers, and unless yours came with a tag I don't know how you could ever be 100% sure which one it is. Regardless of which one it is, tropical hibiscus can definitely be grown in containers (although in your area you could put it in the ground if you wanted to).
plantsforpeg
Ventress, LA
(Zone 8b)

June 10, 2011
4:49 AM

Post #8621683

I too had the same problem and found white flies had attacked my hibs.

I read somewhere that you could spray with Murphy's Oil Soap and water.
Since i already had MOS, I gave it a try. I spray once or twice a day.
It seems to be helping my 2 hibs.

Bulpit is the expert with gorgeous hibs. She may be able to help.
blupit007
Clinton, CT
(Zone 6b)

June 10, 2011
8:43 AM

Post #8622112

Haha! Thanks Peg... I don't know about expert with hib's but I have had my share of spider mites! UGH!!! I hate them! Thanks for the compliment! :)
dreamjourney
San Diego, CA

June 10, 2011
9:45 AM

Post #8622197

Ok. This morning I just hosed the plant. How long does it take effect for the recover? Maybe Should I also spray some insectcide soap?
MajiA
Kenner, LA

June 11, 2011
2:08 PM

Post #8624294

[quote="dreamjourney"]Ok. This morning I just hosed the plant. How long does it take effect for the recover? Maybe Should I also spray some insectcide soap?
[/quote]

Don't torture it too much! It is already stressed out and let it settle down. Check the leaves to see that they are clean before you do anything. Also, try to mist the leaves when you water, so that they can have a drink directly and that should help. From my experience, it will take one to two weeks to see the difference. Sometimes those yellowing leaves are irreversible. They will fall off, but you will get new vigorous growth.

I have corresponded with two very knowledgeable hibiscus gardeners in my area. From what was conveyed to me, Hibs like water passing over their roots, but do not like standing water. They are heavy feeders but like to be fed with diluted ferts and often. When spraying with insecticides, spray near to sundown so that the scorching summer sun does not literally boil the leaves. Also, try to provide some protection from the scorching mid day sun.

Good luck and keep your fingers crossed. Just keep on watering and misting, and making sure that the plant is drained properly.

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