My gray water from my washing machine and from the bathtubs goes directly out to my plants and trees, on the ground, never sprinkled onto leaves. My sinks and toilet go into a septic system. My grandmother's
roses thrived on the water from her washing machine.
I don't pay particular attention to organic detergents or anything. And even bleach in moderate amounts have never harmed my plants as far as I can tell. I don't use much else like fabric softeners. They have been dosed with occasional bubble baths or bath salts over the years (20+). All without visible harm.