Using regular garden soil to germinate plumeria seeds is not recommended. Plumeria seeds have specific requirements for soil that regular garden soil may not meet. Here’s why it’s advisable to use a well-draining potting mix or a specialized seed-starting mix instead:

1. Drainage: Plumeria seeds are sensitive to waterlogged conditions. Regular garden soil may not provide the necessary drainage, and excess moisture can lead to the rotting of the seeds before they germinate.
2. Aeration: Plumeria seeds require good aeration around their roots. Garden soil may compact over time, reducing aeration and hindering seedling development.
3. Nutrient Balance: Plumeria seeds don’t need rich or heavily fertilized soil to germinate. Regular garden soil may contain excessive nutrients that can be detrimental to seedlings at this stage.

To ensure the best conditions for successful Plumeria seed germination, it’s recommended to use a potting mix specifically designed for starting seeds or a mix suitable for succulent plants. These mixes are well-draining and provide the right balance of aeration and moisture retention.

If you use garden soil, consider amending it with perlite or sand to improve drainage and aeration. However, using a specialized seed-starting mix is the most reliable way to create an environment that meets the specific needs of Plumeria seeds during germination.