I have three Shamel Ashes in my yard, all planted at roughly the same time and all irrigated in the same way. Despite professional care they haven't shown any substantial growth in over a year. If anything, they have thinned.
I live in Phoenix, Arizona (US). My research leads me to believe that the tree may struggle a bit in the hot weather but are still a viable choice for the region. I don't believe that they have been substantially under/over-watered though I could certainly be wrong. A small number (< 10%) of leaves have brown tips.
Each tree is currently watered with four drip lines located a short distance from the trunk. They are shown uncovered (normally they are buried) in the picture below.
The water has been on for an hour in this picture. Even if it soaks to an appropriate depth, it doesn't look like the water is well-distributed.
- Should I add more drip lines?
- Change the irrigation method entirely?
- Or should I be investigating other problems?