I am currently on year 1, summer day 2 I am playing on a Nintendo Switch On the first day of summer I planted 9 melon seeds, watered them, and ended the day. When I woke up, one of the crops turned into a purple dot. Is this a glitch, or an event in the game? Is my melon gone forever?
Give it another day. It may have not germinated. You may have missed it with the watering can. Sometimes seeds just do not sprout immediately. If it doesn't grow by tomorrow, plow it under and plant another one.
It's a glitch. Firstly, it was watered because it is still watered. It's a known glitch where, in some oddball circumstances, some seeds miss a day of growth. There's a thread where we discussed it recently. https://community.playstarbound.com...hers-no-fertilizer.141027/page-2#post-3254415