Nutrients Needed for Willow Trees

Question

What do I need to do for my willows? Their leaves are coming in a yellowish green. They are not a vibrant green. What is my soil missing? We have fertilized the lawn but are still not happy with the color of globe willow or weeping willow.

Answer 1

Most likely, it is a nitrogen deficiency. Use a nitrogen rich fertilizer. These articles will also suggest other possibilities:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm
https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm

Answer 2

fish emolision work wonders on willows, working some fresh peat into the top inch of the soil, and some liberal watering .

it's what my grandpappy does