Organic fertilizers are generally less likely to burn plants, including plumeria, compared to synthetic fertilizers. This is because organic fertilizers release nutrients more slowly and over a longer period. However, it’s still possible for fertilizer burn to occur if organic fertilizers are used improperly. Here are some key points to consider:

1. Over-application: Applying too much organic fertilizer can lead to a concentration of nutrients that is too high for the plumeria to handle, potentially causing root burn or other stress symptoms.
2. Type of Organic Fertilizer: The composition of the organic fertilizer matters. Some are more concentrated and can be stronger than others. It’s important to follow the recommended application rates on the product label.
3. Soil Condition: The condition of the soil also plays a role. Poorly draining soil, for instance, can retain too much of the nutrients, increasing the risk of burn.
4. Application During Dormancy: During dormancy, plumerias significantly reduce their nutrient uptake. Applying fertilizer, even organic types, during this period can be unnecessary and potentially harmful. The unused nutrients can build up in the soil and potentially cause issues when the plant resumes active growth.
5. Watering Practices: Watering the plant properly before and after fertilization can help prevent burn. The water helps dilute the concentration of nutrients around the roots.
6. Plant Health: A stressed or weakened plumeria is more susceptible to fertilizer burn. Healthy plants are more resilient and can handle fertilization better.

To minimize the risk of fertilizer burn with organic products, it’s important to follow application instructions carefully, consider the specific needs and growth stage of your plumeria, and ensure good soil conditions and watering practices. During dormancy, it’s generally advisable to withhold fertilization until the growing season resumes.