Q&A for How to Water Plants with Coffee

Watering the leaves is not an issue, since they grow outside and are exposed to rain. Powdery mildew is fairly common in roses whether you water the leaves or not.

Yes. Pepper plants need a lot of nitrogen, and coffee has a high concentration of nitrogen.

Yes, coffee grounds can be used inside and outside to add phosphate and nitrogen.

Coffee will acidify the soil, which is good for bougainvillea, but the most important thing is that they're getting enough light.

Yes, instant coffee added to the soil is a good repellent for insects, as well as fertilizer. However, instant coffee can't be used as a replacement for soil.

Yes. Coffee contains nitrogen, which is very useful to grow spinach, lettuce and other leaf vegetables.