Mulch can be any material intentionally placed on the soil surface that aids in weed suppression, erosion control, and moisture retention, and it can be very helpful in establishing small-scale wildflower plantings with plugs for pollinators and beneficial invertebrates. Mulching can be used both before planting to help prepare the site by smothering existing vegetation and after planting to help suppress weed pressure and retain moisture. It also sends the message that this site is cared for, that these small plants will become something significant.