Jujubes are going into dormancy now. I still suggest, however, using organic fertilizers.
I have Sugarcane & Honeyjar. Of the 2, the edge goes to Honeyjar for flavor, but Sugarcane is great, as well
I know the place in Compton, Rainbow Mealworms. I have several bags of their mealworm castings at my home. I'll sell you 2 bags for $16