Garden novice here. We planted a Lilly pilly resilience hedge about 2 months ago. It's planted on a raised garden bed with new garden soil, mulched with sugar cane and watered twice a week with a water system. It was fed with seasol when planted and also had horse manure dug through. I noticed today there are faint spots on the leaves of some of them and would like to know what causes them and how to manage. Location South Coast NSW.
