I actually have a few just now coming out. Though, we did have a late-frost that hit right when the trees first started breaking, so maybe it took some time to build up enough energy to make another go?
My Jujube tree is so skinny and tall and I donāt have a proper support for it. Just a bamboo stick and so far that has been enough. There was a bad storm couple of days ago and I could see the wind blowing it around all over the place. I was so sure it was going to snap any minute so I had to run out in the storm to secure it. Couldnāt do much at the time so I just pulled the hammock stand close to the jujube tree and tied it to the hammock stand.
A couple years ago I had 2 jujubes leaf out very late. One at the start of August and another at the start of September. Both were at the same property and I later found that the soil stayed very dry. I was later planting one nearby and even a few hours after a rain, the soil was bone dry. I think the one that leafed out in August has lived (barely), while the one that leafed out in September didnāt come back the next spring. You may want to give them some extra water and a layer of mulch.