Hi I have (28) green gem boxwoods (Buxus green gem) , planted in the spring of 2021 that have a leaf discoloration issue. Here is the background info: - planted in 9" diameter cloth grow bags, spring 2021 - soil planted in standard retail shrub soil with bark on top to retain moisture - plants are located on South side of a building deck (floor 5) with late morning to full afternoon sun - plants were trimmed for the 1st time in may of 2022 - plants developed yellowing of leaves summer of 2021 and summer 2022 - plants were fertilized with 13-3-13 fertilizer spring 2021/2022 - plants are watered as needed (checked one plant and found no root root, roots seem to be healthy) - soil was tested and found to have basically neutral pH - the picture of the 3 leaves: the yellow tipped leaf is the most predominant among the problematic leaves with a few leaves being the middle discolored leaf and only a few with the black tipped leaf - the picture of the terra cotta planting has not been trimmed at all and shows little sign of yellow tipping and is in greater shade than the rest of the boxwoods - plants are located in Seattle Any help with diagnosis is appreciated. Dave