*How doe the speaker use nature to present symbols in “Porphyria’s Lover” and “I think of Thee”?

In both poems the speaker use personification mentioning trees, in the poem “think of Thee” the speaker use vines saying there are wild and messy to show how much she loves that person that when she thinks about him it stops her focusing and that her thoughts are wild and growing every time she thinks about her lover and also she is wants to express her sexual attraction to him   “About thee, as wild vines, about a tree” while in PL the speaker present nature in the opening if the poem