My plumeria has been in the ground for three or four years; we live Inland North County San Diego. The only branch on my plumeria has a shriveled area in the middle of two seemingly healthy areas. It started showing leaf promise a couple months ago but hasn't progressed any further. We had several blooms and leaves last year and were very hoping to have more this year.
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I'm listing several articles that will help you access the growing conditions.