Yes they will fall off when the plant has produced what it can or due to a change in conditions (example: perhaps the plant dried out too much, or in this case likely caused by spider mites.). By itself I would not consider it to be a problem indicator. But looking at the leaves I recommend you treat for spider mites. My preference is neem oil spray as I have understood it does not negatively impact bees or butterflies. We are in the migration routes for Monarchs so I try to do my part as best I can. Other products such as a 3in1 from Bayer or Garden Safe I have used in the past without any adverse impact to the Plumerias.

I saw the other day my Waimea dropped its partially spent infos as it got too dry from being laid over for 4 days during high winds. I thought it would keep going but it didn't. Oh well...It happens. There is always next year.

Thanks for letting me know! I'll be sure to get some spray. Back to the other post we were talking in about yellow leaves, you mentioned mine was probably from not watering enough. When the soil is still moist I don't water it. So should I water it even when it's moist? I added some more pictures for a better look.

I think more watering, when taken with the other conditions of 100F+ temps, a young plant and now seeing an image of it, is not necessarily the solution.

Try this: lean the pot over at a 45 degree angle for a couple of minutes and see how much water comes out of the container. It's a trick I learned as a newbie on this forum.

Since you are treating for possible spider mites (not 100% sure you have them from just looking at the pictures) I recommend you move it to a morning sun and filtered day and afternoon shade location for next couple of weeks. This is so the treatments don't burn the leaves and the temps may just be too much for the root structure to keep the plant hydrated...if for no other reason its just young.

If the soil is staying moist for days after you water then perhaps at a later point down the road consider adding pumice or perlite to your mix to assist it in draining faster. Wet or moist has different meanings to each of us so please take this with a grain of salt and look at all the conditions as a whole and not just advice here.

I do recommend you remove the drip saucer to let the water drain out without being caught and wicking back into the root area.

Thank you for all the information I really appreciate it! Unfortunately the drip saucer is attached to the pot but I'll keep an eye on it from now on.