acidic.

But, if you are using containers, you shouldn't be using topsoils--use a soil-less medium. Acidic ferilizers will help the hibiscus uptake the magnesium and manganese, iron ions bettter to prevent yellowing of their leaves.

Poiu, Oh no, I don't use top soil in any indoor/tropical plants.
I do mix my own soil using All Purpose, peat, sand, perlite, vermiculite, etc..depending on the plant.

I couldn't find info on soil for Hibs. I bought a soil substrate that is a little low in pH, slightly acidic and was wondering if I should add this stuff to my soil mix.
The thing is, I've 3 hibs, now 4..I really don't want to lose this new hibsicus..It's variegated but not your typical variegaetd green and white..this has pink, white, green..My oldest tropical his is 11+ yrs old. Treeform..

Anyway, thanks for the help..so going by your statement, I'll add this mix..thanks, Toni

You have a green thumb. BEAUTIFUL plants you have, Hopefulauthor :)

Jlosc, thanks so much..You really made my day..(S)
Living in Fl, I bet you have some real beautys..Lucky you..Toni