It is not recommended to use regular garden soil for germinating Plumeria seeds. Regular soil may not provide the ideal conditions for successful germination, as it can be too dense and hold excess moisture, leading to seed rot. Instead, use a well-draining and porous seed-starting mix or a blend of peat moss, perlite, and vermiculite. This type of growing medium ensures proper aeration and moisture control, creating an environment conducive to seed germination. Specialized seed-starting mixes also have fewer pathogens that can potentially harm germinating seeds, improving the chances of successful germination.