Here are the location of all Naku Weed in the game. There are 2 shop that sells this item, one in Inazuma, and another one in Port Ormos. Both sells 5 Naku Weeds for 1000 mora each. 8 Naku weeds can be obtained by planting its seeds inside the Serenitea Pot. The rest can be obtained in the overworld. Do keep in mind that some of these Naku Weeds are located in an area which is affected by either Balethunder, lightning storm, or both.
I will also include a video for this guide. This video is a little bit old, but it should still helps a ton in your search. Because the only missing part of the farming route in this video is the one shop in Port Ormos, which was not present when the video was made.
Don't forget 5 Naku Weeds in Babak's shop in Port Ormos
See also:
Ascension Material Farming Guide
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