Sub-irrigation

Sub-irrigation or watering from the bottom is a popular and very acceptable watering method. It is often used with African violets. However, continued sub-irrigation can cause a build-up of fertilizer residue into the soil and sometimes onto the soil surface. This is often seen as a white, crystalline appearance on the sur face of the soil and even the pot itself. If subirrigation is to be used, at least once a month, water the plants from the top to flush out the fertilizer residue.