Plant leaves resist adhesion of water and dirt due to convex geometry on their surface.

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"Non-smoothness is a common natural phenomenon in [the] biological world, which has been formed during the long evolutionary process of living creatures as a stable, self-adaptive system. The non-smooth surfaces of plants, resulting from long interaction between self-growing mechanism and external environment, exert several important functions, such as water repellency, anti-adhesion, and self-cleaning." (Ren et al. 2007:33)

Journal article
Non-Smooth Morphologies of Typical Plant Leaf Surfaces and Their Anti-Adhesion EffectsRen, Lu-quan; Wang, Shu-jie; Tian, Xi-mei; Han, Zhi-wu; Yan, Lin-na; Qiu, Zhao-mei

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