At the preschool age you can share your love of language and literature by reading poetry out loud to your child/ren. You will enthuse their interest in poetry if you yourself are enthusiastic and interested in it. As it states in my Montessori training manual: "Assess yourself and your attitude. Remember, the child who is still in the absorbent state of mind [from birth to six] absorbs your attitudes.You are not just giving concrete experiences [by reading poetry], you are giving children exposure and a love for [poetry], which they will study, in depth, later on."
Then, when the child is reading comprehensively (by third grade or age eight) you can introduce the poetry basket. But first, let me review the several levels to reading (quoted from my Montessori training manual).