Q.Why Is My Moon Flower Now Blooming Purple Blooms?
I harvested seeds from the fall. Planted them this spring and now the blooms are purple instead of white. What happened to them?

Certified GKH Gardening Expert
They were pollinated by a different color variety. Planting the offspring will exhibit traits from both parents, or since purple is a dominant trait, will show the dominant trait.
Here is an article that will help you with their care:
https://www.gardeningknowhow.com/ornamental/vines/moonflower/growing-moonflowers.htm