Download the MHW Editor and extract all of the zip file into one folder. Once it's extracted, open the plant_item.plit file with MHW-Editor.exe (set it as the default program to open that file with). It should be fairly self-explanatory how to edit the file once you've opened it with the MHW Editor. You can change the numbers to whatever you want and then save when you're done. Make sure the edited file is in the correct place in your Monster Hunter World/nativePC folder.
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If you have any questions about how to use it feel free to ask