Every Nakshatra is associated with a tree.
Here is the list of Nakshatras and the trees associated with them.

It is extremely auspicious to plant the tree connected to your Janma Nakshatra (nakshatrafinder.com) and one of the best remedies for Shani is to plant the tree connected to the nakshatra where Saturn is placed in your birth chart.

NakshatraTree
1. AshwiniPoison Nut Tree
2. BharaniAmla Tree
3. KrittikaCluster Fig Tree
4. RohiniJamun or Java Plum
5. MrigashiraCutch Tree
6. ArdraAgar Wood or Krushnagus
7. PunarvasuBamboo
8. PushyaSacred Fig or Peepal
9. AshleshaAlexandrian Laurel or Nag Champa
10. MaghaBanyan Tree
11. Purva PhalguniPalash, Flame of the Forest
12. Uttara PhalguniRose Laurel, Juvvi Tree
13. HastaHog Plum, Jaai
14. ChitraBilva, Golden Apple
15. SwatiQueen’s Flower, Arjun
16. VishakhaNagkesar or Wood Apple
17. AnuradhaBakula, Nagkesa
18. JyesthaRed Silk Cotton Tree
19. MulaSalai, Black Dammar
20. Purva AshadaSita Ashoka / Rattan Cane
21. Uttara AshadaPhanus / Jackfruit
22. ShravanaSwallow Wort Milkweed
23. DhanishtaShamee / Indian Mesquite
24. ShatabhishakKadamba / Common Bur Flower
25. Purva BhadrapadaPichamanda, Mango
26. Uttara BhadrapadaNeem / Indian Lilak
27. RevatiIndian Butter Tree