HI e.heffren I assume its a tropical hibiscus if so it sounds like it is under stress of some sort.i would remove the leaves with black spots on them and discard them into the trash can,it should be putting on new growth so it will hurt the plant.here is a link i found for you that will help your hibiscus plant.it deals with hibiscus plants only.
http://www.hibiscus.org/faq-2.php
it should have all the information you will need to bring it back to good health.hope you find it helpful.your friend in gardening.mike57

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No One Can Make You Feel Inferior Without Your Consent.

oHi Elisabeth,
in my country (Roumania / south -east Europe)from this hibiscus problem we make thus: buy a bottle of beer and washing the hibiscus's leaves with beer. (once per month)
It's not a joke. The properties of the beer are so good from the hibiscus.
Now, I'm not sure if that "recipe" is available for your area!
By the way, what kind (tipe) of Hibiscus you have (Natasja, Ivan Smith, Miss Liberty, Concorde, Eye of the Storm, Fifth Dimensionetc) or Hibiscus Divaricatus, heterophillus, diversifolius, Splendens or Australian Native Hibiscus (all latest are australian species).
If you want I help you, I am looking forward to more details.
I'm sorry for my English, but it's not my native language!
PS: In Romanian the name of hibiscus is trandafir japonez (chinezesc) translate in english word by word japanese (chinese) rose

Toma Welcome to the forum. I would love to have seeds from your Hibiscuc in Romania as well as any seed from your Australian Hibiscus. I have also seen it called Chinese Rose. your post are very interesting can learn a lot of you. i have som Manhot Sweet Yellow will be getting seeds from if you like. also go to my photobucket link you can see what Hibiscus I have.
Jimmy

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Meet Clyde my Male Sugar Glider. Clyde says.
Keep it organic
GOD BLESS THE U.S.A.
Pray for our Troops!

e.heffren: You have a braided Hibiscus Mine are Tropical have one that is a kind of pink and the other is Yellow. I have to bring mine inside in the winter. But I do most of mine anyway so far have had very good luck doing that. If the leaves are shiny it is probably a tropical go to my photobucket and look at mine if yours look like that they are tropical but if the leaves are not shiny but kind of dull most likely you have a Hardy. My grandsons girl friend is asian she said the braided Hibiscus is for luck.
Jimmy

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Meet Clyde my Male Sugar Glider. Clyde says.
Keep it organic
GOD BLESS THE U.S.A.
Pray for our Troops!

Mary: Have you tried making a garlic pepper tea with dish liquid or a tea out of organic cornmeal? I had a few blackspots on mine last year they were in full sun. Sprayed it a couple of times have not seen any since. Like Mike57 said you may want to pull your leaves off and put in the garbage can to be sent to a landfill. If you do always pull up on the leaf never pull down as it can stipr the bark on the branch and cause more damage. the cornmeal tea you take and put in an old panty hose or any Nylon stocking and place in a container of water let it set a few days then put in a spray bottle makeing sure NO cornemal solids go into the spray bottle and spray every inch of the plant real good do not miss anywhere get it all. also put that cornmeal in the soil it is a fertilizer as well as a funcacide and is 100% safe for all children and pets. Hope this helps you.

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Meet Clyde my Male Sugar Glider. Clyde says.
Keep it organic
GOD BLESS THE U.S.A.
Pray for our Troops!