I have been squirting a 5% neem and water solution on it. It comes back. I use the flat sprayer on the hose and really turn on the pressure to clean it off and it comes back. I dont want to lose any leaves. The soil her is very sandy, poor but good drainage. Plants get lots of sun. Only one plumeria out of 4 gets and t hey are quite separated. Now a plant whose name I forget get it. I'll look that one up. Very common n FL also used as a flowering hedge. Comes in dwarf also and red, orange, yellow, or coral flower clusters. This one is also far from the others. Could I be overwatering?
It sounds like powdery mildew, but make sure it isn't mealybugs which leave white cottony growth at leaf and stem joints. (info below). Powdery mildew can be treated with a fungicide suggested in the article below, however prevention is more effective than trying to remedy a fungal infection.
Most plants are not permanently harmed by powdery mildew except for fruit plants and if the mildew continues year after year.
https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/pest-control-for-plumerias.htm
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm
Overwatering probably isn't causing the mildew as much as humidity. Make sure you don't wet the leaves when you water, always water from below.
A neighbor gave me her plumeria plant - it only ever had one leaf and she thought perhaps I could do something with it. The plant has grown beautifully and is now full of leaves and producing more - but no blooms.
They need sun, water and fertilizer to bloom. Here is more:
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/plumeria-does-not-bloom.htm
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/how-to-fertilize-plumeria.htm
I cut back my Plumeria plant to about 12 inch fro m the soil. The stems are firm and smooth. I do not see any new growth this Ohio Spring/Summer.
If these are in ground, or were unprotected from the Winter, then they are certainly dead.
These are tropical to subtropical, and will not usually survive below zone 9. Your area is zone 6 and is way out of their native range.
Here is an article for more information on the the plant:
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm
These plants have been in the pots since the beginning. Would I cover them if we do get a little cold weather
They are hardy in zones 10 to 12 so central Florida is rather risky. If planted in a protected area they may do fine. When danger of frost is expected, they would need to be covered.
I have three, all mature, a pink and a white that have both bloomed dependably before. The other is a fuchsia and it bloomed a little once. The last several years only my white one sets flowers. The white and pink are inches away from each other and the other is about 3 feet away. All get the same sun and water and fertilizer ( miracle grow super bloom). Any thoughts?
It may be the fertilizer. They are quite picky about the NPK values. Usually, a 10-30-10 is best.
Another thing to note is that your fertilizer of choice is water soluble and fast acting. Fertilizers like these need to be applied every 2 weeks to a month. Underfertilazation could be responsible depending on how you feed.
They are quite particular about pruning, as well. Pruning out of season will halt flowering production.
Here are two articles that will help:
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm
https://www.gardeningknowhow.com/ornamental/flowers/plumeria/plumeria-does-not-bloom.htm
ed. Do you know of this? The older leaves do have brown spots under the leaf but that has always been the way with my plumeria and didn’t seem to stop blooming or affect the leafing.
It sounds like the plant needs calcium. This article should help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-and-calcium.htm
Need to know how to treat pod now. Since been on tree long time, hope I can still get seeds.
Glad you let the pod fall off on its own. When it begins to split, the seeds will be ready to harvest.
Here's an article to help you: https://www.gardeningknowhow.com/ornamental/flowers/plumeria/harvest-plumeria-seeds.htm