Some plants are rarer than others, and some are exceptionally hard to acquire. As a rule of thumb plants with a scarcity of Rare and Very Rare belong in this category.
Rare plants are those that would require a fair amount of wealth to be able to purchase, or a story arch to their native location to harvest them.
Very Rare plants are those that can still be found in the wild, but are either not sold, or can not reasonably be purchased either because nopony sells them, or the sheer cost. These should require a significant investment of time and effort to obtain.
For a sample page, see the main plants category, linked below.
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