The Thenmala Ecotourism employs a novel concept to popularise tree planting. Astrologers believe that each constellation of the zodiac is associated with a tree. It has developed a Nakshatra Vanam where trees associated with the 27 constellations or nakshatras have been planted. Those trees are of medicinal, social, aesthetic or economic value.
The Thenmala Ecotourism Society maintains a nursery of these trees and sells the seedlings to visitors. It is believed that if one plants a tree associated with one's star, that will bring good luck. So People buy and plant them at their homes.
The following are the trees associated with each Nakshatra:
| SI. No. |
Constellation | Tree | |
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| Malayalam Name | |||||||
| 1. | Aswathy | Kanjiram | Nux vomica | ||||
| 2. | Bharani | Nelli | Indian Gooseberry | ||||
| 3. | Karthika | Atthi | Cluster Fig | ||||
| 4. | Rohini | Njaval | Jamun | ||||
| 5. | Makayiram | Karingali | Cucth Tree | ||||
| 6. | Thirvathira | Kumbil | Cashmere Tree | ||||
| 7. | Punartham | Mula | Bamboo | ||||
| 8. | Pooyam | Arayal | Sacred Fig | ||||
| 9. | Aayilyam | Nagapoo | Messua Tree | ||||
| 10. | Makam | Peral | Banyan Tree | ||||
| 11. | Pooram | Chamata | Flame of the Forest | ||||
| 12. | Uthram | Ithi | Indian Laurel | ||||
| 13. | Atham | Ambazham | Hog Plum | ||||
| 14. | Chithira | Koovalam | Beal Tree | ||||
| 15. | Chothi | Neermaruthu | Arjuna Tree | ||||
| 16. | Visakham | Vayamkatha | Governor's Plum | ||||
| 17. | Anizham | Elanji | Bullet Wood Tree |
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| 18. |
Ketta |
Pachotti |
Bodh Tree |
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| 19. |
Moolam |
Veluthakunthirikom |
White Dammar |
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| 20. |
Pooradam |
Samudrakai |
Fish Poison Tree |
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| 21. | Uthradam | Pilavu | Jack Fruit Tree |
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| 22. | Thiruvonam | Erukku | Gigantic Swallow | ||||
| 23. | Avittam | Paarampu | Indian Gum Tree | ||||
| 24. | Chathayam | Kadambam | Kadam Tree | ||||
| 25. | Pooruruttati | Mavu | Mango Tree | ||||
| 26. | Uthrattathi | Veppu | Margosa Tree | ||||
| 27. | Revathi | Iluppa | Butter Tree | ||||