2. Want nothing that the thought of hearts can mend: i.e., lack nothing that a lover's heart could ask for.

6. thine own: your due.

7. confound: destroy.

11. churls: base fellows, villains.

14. soil: i.e., ground; basis. —The poet is continuing the garden metaphor of "flower" and "weeds."  common: low; base. —The word "common" implies that the poet's beloved is seeing a lot of other people. A prostitute was called a "commoner" because she was used in common by many men.