How do you get thistle?

[Pebblestream]

You collect brambles. You should find them in a lot of places, all over. Collect three of them, and they'll then turn into a thicket. You can carry three thickets at a time.

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--------> Leopardshadow, I thought that too. xD I was like; Laying on horsetail and stones must be really comfortable.

[Mellowheart]

*pokes Ember* bad Ember, BAAAD KITTY! YOU STOLE MY PRICKLY PEAR!!

Do you see those prickly looking things around the map? Those are Brambles. If you stack 3 in your inventory you get a thicket. Hope this helped!