The concept of "davar sheino mitkaven" - something with unintended consequences. 

Items which may or may not be kilayim

Introduction to Shatnez

Concluding the discussion of kilayim of animals. 

Introduction to concept of Kilayim of animals

The end of Chapter 7 of Kilayim - including what to do if your field is robbed, as well as other examples of the produce being permitted despite it being kilayim. 

Situations in which you can benefit from kilayim even though you shouldn't have planted it in the first place. Also, what happens if you grow your grapes on top of your friend's grain?

What happens if a vine is buried underground?

Some specific laws about the aris. 

When vines grow on structures, sometimes the structures are considered part of the vines themselves.