White Cedars showing signs of the high iron base burn.
Lawn Weed Control Damage To White Cedars:
Fiesta (high iron) is still the best weed control on the market. However, when improperly applied, this product can cause damage to well established cedar trees. We have found that in locations where a treated lawn drains onto the base of White Cedars and water pools after irriation or rain, the Cedar foliage can be burned and the iron overload frequently kills clusters of trees. If you have experienced this, please notify me. There is a study at the University of Guelph that is looking into this situation.