Fact 1: When a plant grows , the size of the leaves of that plant may increase.

Fact 2: Perennial types are planted outside in spring.

Given the two facts above, answer the question "what may have its leaf size increase as it grows?" with the following options: 
- tiny polyps
 - gene flow
 - h2o
 - grass
 - subtropical
 - humans
 - Tropical
 - perennials


 

        perennials 