I am asking this question for my Mimi. Since you only let teachers and
students K-12 ask questions she has asked me to help. Mimi has grown
morning glories on her fence for several years. She just noticed today
that some of the flowers are frilly instead of trumpet shaped like they
have always been? She never plants new seeds they always grow from the
seeds that were pollenated the previous year.
Perhaps variation in the flowers. Or other kinds of morning glories
(varieties or species in the same group) have seeded themselves there.