green plumbing showdown: greywater recycling vs rainwater harvesting

"Maybe your plants perked up because of the extra water rather than the soap itself?"

Yeah, that's a good point—my experience has been similar. I tried biodegradable soap in my greywater system for a while, and honestly, I didn't notice much difference in plant health compared to plain rainwater. Could it be that certain plants are just more sensitive to soap residues than others? Tomatoes seem pretty picky in general, at least mine do...

I've wondered about that too. My folks had a greywater setup for a while, and their roses thrived on it but the cucumbers didn't do so hot. Maybe veggies are just more sensitive to soaps than ornamentals? Or could it be the soil type making a difference—like sandy soils letting soap residues wash away easier compared to clay-heavy ones? Just thinking out loud here...