Houseplant soil mix provides optimal conditions for indoor plants. It comprises soil materials (compost, peat moss, sand) and enhancements (fertilizers, organic matter) to ensure proper nutrient availability and drainage. Soil physical properties like texture, structure, and drainage are crucial for root development and plant health. Classifying soil mixes based on physical properties helps match them to specific plant needs. Soil experts (scientists, horticulturalists) guide on selecting and improving soil mixes, ensuring optimal growth for indoor plants.