Spring has arrived and homeowners are eager to spruce up their lawns. Everywhere you look, mulch is being spread on landscaping beds, including those around the perimeter of homes. Both functional and decorative, mulch is an essential component of low-maintenance landscapes. But homeowners beware . . . stacking mulch too high against your foundation can lead to serious problems such as insect and water intrusion. Moisture can soak into your house and lead to mold damage. Always keep the mulch level below the siding.