Post by Eropixel in Mission help section (spoilers)

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Were to find the Herbs for the transformation potions.

All the three herbs can be found in Resta Field.

-The Blue Herb can be found in the Lake near the Mysterious Tent.

-The Red Herb is near the mines.

-The Purple Herb is near the Forest Entrance.

*Different items can be found in the gather spots, if you don't find the Herbs, you can pass the day and try again.

is this still the only place to get Purple Herbs or are there other locations now?

Yes, they can be found in other zones.