Definition
"Pearl-weed" is an alternate spelling of "pearlweed", referring to plants with small, pearl-like foliage or flowers. It most commonly describes aquatic plants used in aquariums. These plants form dense, carpet-like mats. They're easy to care for, and create an oxygen-rich environment for fish. The hyphenated form simply reinforces the descriptive nature of the name. Think of them as the eco-engineers of your fish tank. They are similar to the oxygen factories of real-world ecosystems.