greetings!

There are different schools of thought on fertilizers. But most agree to NOT fertilize when they are going dormant, or anytime during dormancy. I don't usually fertilize until plants are growing well. That's usually sometime in June for me.

And there doesn't seem to be any real evidence that a high middle number (P) helps with blooming. Plumerias will bloom when the branch growths are mature enough and when the plant has enough resources (good root system, beefy limbs, etc.) to expend energy on inflos.

Also, you don't really want a super-high Nitrogen fert either as the plant may grow too much soft leafy growth instead of blooming.

Now, some do advocate using a source of Magnesium (like Epsom salts) to give the plant a boost in preparation for dormancy and then again in Spring? I may have that wrong so hopefully Bill with comment.

Dave, I use potassium in the fall to harden for winter and magnesium in the spring to help the plant process fertilizers. I start with a high nitrogen in the first month in March and then switch to a low nitrogen by May. I give the magnesium once a month in the spring. But, I agree that the plants flower when they are ready. Also any fertilizing in late summer or into the winter creates green growth that is easily attacked by black tip and rot. So much depends on the type of weather and climate you have- in Calif. we warm up in March but get fogs and dampness in May and June and then have a late summer with little humidity. This year I am getting many new inflos now and the weather has been very wierd (rain in October). Bill

I also fertilize for the first time in early March. I look at the branch tips to see if the "claws" are shiney as an indicator. They are usually unprotected and back to their sunny spots around the yard by then too.