Matera translates to "flowerpot" or "plant pot". It's an interesting word because while related to flowers, it's not as common as flor (flower) or jardín (garden).
In the song, Thalia sings, "Te pondré en una matera" (I'll put you in a flowerpot). This line is playful and a bit possessive, suggesting she wants to keep the "florecita rockera" (rocker little flower) all to herself, nurturing it in her own space.
This song is a playful and passionate declaration of love, using a powerful central metaphor: the object of the singer's affection is a "Florecita rockera" (little rocker flower). This nickname perfectly captures a person who is both beautiful and natural like a flower, but also has a cool, edgy, rock-and-roll spirit. The singer is so overwhelmed by this person's charm that they feel traditional compliments, like giving flowers, are not enough—after all, how can you give flowers to someone who is an entire "jardín" (garden)?
The lyrics describe an intense, all-consuming attraction. The "rocker flower" is blamed for awakening the singer's "pasión" and lighting their "hoguera" (bonfire). This passion is so strong that the singer playfully wants to possess the flower completely, fantasizing about transplanting it into their heart and putting it in a "matera" (flowerpot) to keep forever. The song's imagery gets even more vivid when the singer compares themself to a "picaflor" (hummingbird), eager to taste all the "miel" (honey) the flower has to offer.