Plant leaf hairs, or trichomes are vital for many reasons.
Interestingly in 1975 researchers were correct when they stated:
"It can be argued that essentially the same genetic system should be required for both root hairs and trichomes." [1](Pay-wall)
For example:
- C. salvifolius, there are more adaxial trichomes present to avoid UV light from injuring the abaxial surface.[2](Pay-wall)
- Increased transpiration [3](Pay-wall)
- Protecting against insect herbivores [4](Pay-wall)
- Increasing tolerance to freezing [5](Pay-wall)