Mulberry cuttings are kinda tough to root. They love to leaf out and make new berries, but then everything shrivels. Last year I got around 14 FRESH cuttings from a dude about an hour or two from here. We went to his place, and he pruned the cuttings in front of our eyes. They immediately went into a bucket of water, and the next day got planted in-ground on a drip system. One got put into a pot. It looked really happy like yours. Then it withered. The ones in ground all showed promise, then one by one, they withered. One on the end took it's time. That one rooted for sure. It's now 4' taller than it was and covered with leaves and new berries. The one on the other end was really slow, but a couple months after the first rooted one took, it began to grow and it's still lagging, but showing life again. The rest are def. dead! EXCEPT for one. It's probably dead, but could it stay in ground an entire year and finally do something? It's got a little fuzz on it's buds and they look kinda pale green. Probably wishful thinking, but I hope it comes around and roots. JD can't figure out why I care. "What will we do with it?" I shrug. I'll gift it to a local here who can pick it up. He was OK with that. IF it lives! Doubtful after a year of looking dead...........
Suzi