Plumeria forum→Looking for help with my potted plumerias

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Name: Matt B
Perrysburg, OH (Zone 6a)
May 20, 2020 6:17 AM CST
Hi everyone, I have (3) plumeria plants that I started from seed about 4 or 5 years ago. I live near Toledo, OH so we keep the outside in the summertime and pull them in in the winter. Over the years, I have stepped up the size of pots they are in with the most recent replanting towards the end of last summer. When I replanted them, I used a cactus mix of potting soil and added some perlite to the mix to help with drainage. Typically when we have them outside for the summer, we let the rain water them unless it's really hot and dry for a while, then I'll give them a good watering. When we have them inside over winter I hardly water them. They are in a bedroom that we keep at about 75 degrees in a west facing window. They drop their leaves and go dormant so I don't give them much water.
Over the years, they have never bloomed (yet). I found some different foods on Amazon and ordered some and tried them out for the first time this past weekend. I attached pictures of the two I tried. I followed the directions on the labels as well to make sure I wouldn't overdo it. I don't know if it's just a coincidence or possibly caused by the feeding but I noticed the leaves looking odd.
It has been unusually cold here so I am just now starting to harden them up to get them back outside. I am setting them outside during the day and bringing them into the garage at night and plan to do this until we finally hit the 80s this weekend. Anyway, the leaves on one plant are curling under but are still rigid feeling. The leaves in another plant look like they have spots on the upper facing of the leaves but not the underside. There is also a wilty leaf that is about to drop. I can't remember if this happens every year for me so I wanted to reach out and see if anyone has any helpful information? I poked around on the internet and it sounds like maybe the spots are a fungal issue... But it also says the underside of the leaves would look rusty which they don't so I wasn't sure if it is the rust fungus.

If there's any other info you need, please let me know. I am desperate to get these things blooming. My wife and I bought the seeds on our honeymoon when we were in Hawaii and want to finally see the flowers here in Ohio! With that said, I also want to make sure I'm not overdoing the fertilizer and burn them out.
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Name: Alice
St. Johns, FL (Zone 9a)
Charter ATP Member Master Gardener: Florida Organic Gardener Enjoys or suffers hot summers Dog Lover Hibiscus
Orchids Fruit Growers Tropicals Hummingbirder Garden Photography Container Gardener
May 20, 2020 6:51 AM CST
While overfertilizing can cause leaf curl it is rarely fatal. We have a forum here that is devoted to gardeners who grow Plumerias, I am going to suggest you repost there. I am sure some of the growers can provide specific answers for you.
Minds are like parachutes; they work better when they are open.
Name: Jason
Houston, Tx.
May 20, 2020 4:51 PM CST
At first glance, it looked to be leaf burn from spraying fertilizer on the leaves. It looks like there is also some black specks along with the yellowing which would lead me to believe it's something fungal. You should be able to pick up some sort of fungicide spray to combat this. As far as fertilizer. I typically don't spray my leaves. Only deep water the roots about once per 3 weeks to a month. The superthrive is not actually a fertilizer, it is only vitamins. It's good for promoting growth, not flowering. The other one is a good time release fertilizer. I use crepe myrtle fertilizer for mine, as you really just want the high middle number to promote flowering. Or just miracle grow bloom booster. I have pretty good luck with these. Your plants look well established at this point, I'd bet money they will bloom this year.
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Name: Jason
Houston, Tx.
May 20, 2020 5:03 PM CST
On another note, when you get to the 80's I would give them as much sunlight as possible. The more sun the better. Good luck!!!
Name: ed
lake worth florida (Zone 10b)
May 21, 2020 4:54 AM CST
you got some good advice, the only thing I would add is about the SuperThrive. I use it to for new transplants or stressed plants,I have heard that too much can effect leaf and bloom normal development. good luck
Name: Matt Fox
Long Island, NY (Zone 7b)
May 21, 2020 9:11 AM CST
Can't comment on the leaves. However, growing my plumeria in NY where it's cold during the winter as well, I can tell you that I only got mine to start blooming when I brought them outside as early as I can, and made sure they got the absolute most unfiltered outdoor sun possible.

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