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Need help identifying cause of leaf spots please!

Posted by kippw (My Page) on
Tue, Mar 13, 07 at 22:09

What an excellent web site! We need some help please. This plant has had almost daily flowers and gets tons of sunlight (two 10x13' windows) It is winter here and we've noticed lately the plant not looking 'healthy'. Seems excessive leaf dropping (5 to six leaves a day). They discolor, spot, curl and then drop. The plant has been in same spot for few years, with a slight rotation every 2 months (turn so other side gets the window). The spots do not wipe off (non-fungus?)

The plant is watered twice a week (wed/sun) 2 litres each time.
The planter is 16" across and 29" deep (its open to the base)
It was fertilized in September with a slow release pellet (Miracle Gro)
Pruning happens whenever it looks like its getting leggy (to keep shape)
no spider mites or other insect visible.
Appreciate any help as we love this plant and are worried

Image link: Need help identifying cause of leaf spots please! (56 k)

Follow-Up Postings:

RE: Need help identifying cause of leaf spots please!

Are there new leaves coming out? Unless a LOT of the leaves fall off, it probably isn't that much to worry about.
How long has it been in that location? With the sun getting stronger, it could be that the leaves are getting "sunburned". The damage looks like a burn; which can be caused by too much sun or cold wind.
Hibiscus do like to be fertilized every couple of months. I'd up the number of times you fertilize. Miracle Grow is fine.
Also, you might want to water the plant when it needs it instead of a set schedule. As the plant grows and the roots system grows with it, it could need water more often. Although, the damage doesn't look like too little water.
I fould a site with some good info on this topic.
Good luck!

Here is a link that might be useful: yellow hibiscus leaves

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