How do you generate a graft in the Grasshopper definition?

Grafting is an operation on data structures you can add to all floating and input parameters. It basically takes the existing data structure and puts all the individual data items in their own little list. It's a good way to disassociate data elements from each other (just like Flatten is a good way to re-associate them). You can always insert a Graft Component in front of the parameter instead of right clicking and enabling the Graft option. The effect is the same.

~David Rutten