I have a couple of jujube trees for quite some time (years) fruit is very small size of a marble why? what do they need that I am not providing ?
Certified GKH Gardening Expert
Please ensure that you give the tree a fertilizer every few months with high levels of phosphorus and potassium, and ensure the tree gets water during dry periods. Here is an article that will help: https://www.gardeningknowhow.com/edible/fruits/jujube/