The best replacement for lemon grass is lemon balm.

The best alternatives to lemon grass are rated as following:
★★★★★  lemon balm
★★★★  citronella
★★★  tanglad
★  citronella grass
★  fresh lemon grass
  lemongrass

Your alternative for lemon grass is not listed? Suggest!
Speaking about lemon grass, one probably shouldn't forget about green apple.

Other search terms related to lemon grass and their ratings are:
★★★★★ green apple
You have in mind a companion for lemon grass and it is not yet here? Propose!



Google Trends

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lemon grass
lemon balm
citronella