Rose of Sharon Problem

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Imred Anna, IL Aug 29, 2008

A friend has 3 Rose of Sharon bushes. Every spring they are loaded with buds BUT 1 of them drops the buds and they never open into blooms. The other 2 bloom normally. Any ideas on the problem?
RED

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ecrane3 Dublin, CA(Zone 9a) Aug 29, 2008

Is there any difference between the three in terms of location, sun/shade, moisture, soil type, etc? If not, then you might have her check for thrips, I know those are common with tropical hibiscus so I wouldn't be surprised if they liked hardy hibiscus species too. Although if all three plants are near each other I would expect they'd be on all of them not just that one, and for them to be on the same one year after year is a little strange. So I suspect it's probably something cultural, either the "bad" one has too much shade, too much/little water, too much competition from a lawn, something along those lines.

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snapple45 Holland, OH(Zone 5b) Aug 29, 2008

Bud drop on Hibiscus syriacus is usually caused by too much or too little water or over fertilization. It's a common problem.

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CoreHHI Bluffton, SC(Zone 9a) Aug 31, 2008

I would second the water problem. In my case to much water will cause a problem. They seem to like pretty dry conditions in SC.

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Imred Anna, IL Sep 01, 2008

But why would only 1 of 3 planted side by side drop their blossoms and the other 2 not drop theirs?

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CoreHHI Bluffton, SC(Zone 9a) Sep 01, 2008

Are they within a few feet of each other? Dig a little hole in front of each of them and see if the soil has about the same amount of water in it.

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Imred Anna, IL Sep 01, 2008

CoreHHI
The answers are yes and yes
RED

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snapple45 Holland, OH(Zone 5b) Sep 01, 2008

Are they the same cultivar? Some are more susceptible than others.

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ecrane3 Dublin, CA(Zone 9a) Sep 02, 2008

Also if you're right on the edge of watering it too much/too little, slight variations in slope, drainage, or the overall health of the plant could make it so that one has trouble and the others don't (at least not yet)

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