Q.Ipomoea Calonyction
My vine is about 5 foot tall. It is in a container. It gets full sun. The blooms come out but do not open fully. I don’t know why I need your help.
Certified GKH Gardening Expert
It looks like it has opened, and finished its cycle by being pollinated. They usually won't last more than a day or so, anyway.
If it is not pollinated, it will close back up during the day to open at night, since these are a night blooming species due to the type of insects that pollinate this flower.
Just make sure to keep the soil nutrients at a moderate level. Too much nutrients will halt flowering for this plant. In fact, they prefer poor soils to nutrient rich soils. Alternatively, just a boost of phosphorus, potassium, and sulfur can help with flowering.
Here is an article that will help you to care for this plant:
https://www.gardeningknowhow.com/ornamental/vines/moonflower/growing-moonflowers.htm