Fennel seeds (Foeniculum vulgare) have a number of Ayurvedic properties, based on its taste (rasa), energy (virya), and post-digestive effect (vipaka). Here are some of its Ayurvedic properties:

1. Rasa (taste): Fennel seeds are sweet (madhura) and bitter (tikta) in taste.
2. Virya (energy): Fennel seeds are cooling (sheet) in energy.
3. Vipaka (post-digestive effect): Fennel seeds have a sweet (madhura) post-digestive effect.
4. Dosha: According to Ayurveda, fennel seeds can help balance the Pitta and Kapha doshas due to their cooling and sweet properties.

Based on these Ayurvedic properties, fennel seeds are thought to have a number of therapeutic benefits, including improving digestion, reducing inflammation, promoting healthy menstruation, improving eye health, and supporting respiratory health. Fennel seeds are also believed to have a calming effect on the mind and can help reduce anxiety and stress. However, it is important to note that more scientific research is needed to validate these benefits and to determine the safety and effectiveness of fennel seeds for these uses.