Soils vary. Sample your soil and have it tested before fertilizing anything.

I just use regular Miracle-Gro. Anything water soluble with a higher middle number in the analysis.

I have a lot of these plants and I use them to make leis. I use 10-10-10 once a week, and use 10-30-10 once a month. Try that, they seem to like it.

Aloha,
Bigb