The plants must be watered regularly -- they will shrivel up and die if you forget -- and can take up to a week to grow. You can fertilise them with magical runes which will help determine what the plant will yield. This can be anything from more seeds and runes to the rarest of crafting items.
It's certainly an interesting mechanic and the range of plants and pots seems quite impressive, as does the detail involved. We're sure Runes of Magic fans will be pleased with this new system. Plus, we think the plants work really well as their secondary purpose: ornamental objects.