Thistles are grown in a thistle garden with one Thistle Seeds according to a complex set of variables. They may contain up to 7 vitamins in low, average or high strengths. The vitamins are:
| Vitamin name | Vitamin code |
| Ascorbin | A |
| Biotin | B |
| Carotene | C |
| Folin | F |
| Niacin | N |
| Pyroxidine | P |
| Thiamine | T |
More information on growing them may be found in the thistle guide.
A complex item, thistles appear in inventory as "Thistle:<vitamin list>" where <vitamin list> is made up of multiple <vitamin code><vitamin level> pairs. <vitamin level> is "-" (low, < 22), "~" (average, >= 22, < 80) or "+" (high, >= 80). Some examples are:
When thistle requirements are listed, any vitamins that are not shown may be at any level.
Uses:
Also see: thistle recipes