When sourcing aquatic plants, prioritize suppliers that provide high-resolution photos or live video inspections of their current stock. Look for vibrant leaf coloration, firm stem structures, and extensive root systems without signs of decay or browning. For tissue culture (TC) plants, ensure the agar medium is clear and free of mold or bacterial contamination. It is essential to verify that the plants are free from hitchhikers such as snails, duckweed, or parasitic algae, which can ruin a buyer's inventory.