Question
My orange hibiscus tree seemed quite healthy.  I replaced the previous one b/c it was covered with black spot.  Now, to my horror, my new tree that's been blooming profusely for months is now covered with black spot.  What happened?  What have I done wrong?  Since it's been hot lately, I'm in Zone 9, should I not have watered the top of the tree with water?  Please help.  I hate the thought of having to throw away my tree.  Thank you.

Answer
Hi Leticia,
Thanx for your question.  What you're talking about is black spot and it's a fungal disease that affects roses, hydrangeas and other plants particularly in hot humid climates.  One way to avoid it is to ensure that when you water these plants water at ground level and not on the leaves.  There are fungicides available at the store but try this home remedy that I found on the web from Southerners who claim it works great for black pot in the South.  I hope this helps.
Tom

Mix 1 Tbsp baking soda in 1 gallon of water and add a tiny drop of liquid dish detergent or 1 Tbsp of Murphy's Oil soap. Spray once a week preferably early in the morning.