rainwater runoff used for organic gardening

Asked July 24, 2017, 4:30 AM EDT

Hello,i am using runoff with a large Mulberry trees canopy overhanging the roof and dumping berries which are interacting with the water producing a rather stinky byproduct with a ph under 6.0. Is this safe to feed vegetables,or any other plants with? Maybe as a compost tea,or foliar spray? I have been diluting with pure water,& feeding directly to the organic medium,which is held in large containers & raised beds.

Hennepin County Minnesota compost mulberry horticulture

1 Response

You are apparently talking about diluted mulberry juice. Mulberry juice (undiluted) has pH 3.3-3.4. I'd suggest composting this sludge before using it. Mix it with a lot of standard compost material (leaves, grass clippings, vegetable trimmings) to buffer the pH. You should also turn the compost frequently, since anaerobic decomposition can lower the pH even further.

A pH of 6 is perfectly acceptable, but pH below 5 can be troublesome.