The "leaves" in the poem refers to the "pages" of the poem that the speaker/writer is going to give to his lover.
Explanation:
Sonnets are the love poems written fr a lover, praising her qualities and even comparing her with various elements of nature to intensify her personality and beauty. the sonnet "Amoretti" was written by Edmund Spenser, an English poet and also a great writer of many other sonnets such as "The Fairie Queen".
The Sonnet I of "Amoretti" started with the lines <em>"Happy ye leaves when as those lilly hands,"</em>, where the "<em>leaves</em>" refer to the 'pages' of the book/poem. He is implying that the pages are lucky and will be happy when they will be turned by the lovely hands/ fingers of the lover (Elizabeth Boyle). He is also implying that the book/poem he will present to his lover are lucky for they will be held and touched by her, which he can rarely do himself.
Showing appreciation means to be there for someone and helping them at the time they most mean it. It also means being kind and nice to a person and supporting their ideas, while staying true to yourself.