How can I tell if my lemon tree is being underwatered and what steps can I take to properly care for an underwatered lemon tree?

Signs of an underwatered lemon tree include wilting leaves, dry soil, and slow growth. To properly care for an underwatered lemon tree, water it deeply and regularly, ensuring the soil is consistently moist but not waterlogged. Consider mulching to retain moisture and adjust watering frequency based on the tree's needs and environmental conditions.