Why is my willow trees loosing leaves and turning yellow

Question

Hi I have five willow trees in a row in a border, but one has completely died and now it seems the next one is also dying. The leaves are thinking out and turning yellow. It being watered regularly and in good soil? Please help

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Answer 1

Yellowing does indicate watering issues; either too much or too little.
Watering. In general, a newly planted weeping willow requires 10 gallons of water applied two to three times weekly for each inch of the trunk's diameter. After the first month, you can reduce watering to once a week
https://www.gardeningknowhow.com/ornamental/trees/willow/grow-a-willow-tree.htm