Question

You can see water collected around your house in which some green patches are seen. What are these green patches. From where do they get food

Answer 1

Answer:

Green stains on siding are usually the result of mold, mildew, algae or moss. ... When house siding begins to turn green, it diminishes the exterior appearance of the home. Fortunately, siding can be cleaned to remove not only green stains, but other dirt and stains that may be taking over the homes' exterior.

Molds are microscopic fungi that live on plant or animal matter. Mold grows from tiny spores that float around in the air. When some of these spores fall onto a piece of damp food, they grow into mold. Food mold feeds itself by producing chemicals that make the food break down and start to rot.