Lustros refers to a period of five years. It's a less common word than 'años' (years) or 'décadas' (decades), making it stand out in the lyrics.
In the song, the narrator uses it to emphasize the immense amount of time they've spent waiting for someone, saying, "Meses, años, lustros te he esperado" (Months, years, five-year periods I have waited for you). This word choice highlights the depth of their patience and longing.
Enjambre's “Tulipanes” is a slow-burn of frustration aimed at someone who keeps disappearing. The singer opens by demanding an answer — “Dime lo que estás esperando” [Tell me what you're waiting for] — and spends the rest of the song watching months and years slip by with no reply. The tulips of the title are what he brought her and never got to give, and by the bridge they're dying on him: “Porque se pueden marchitar” [Because they can wither], “lo que te venía a entregar” [what I came to deliver to you]. He circles back twice to insist he's immune to her perfume, which only makes it clearer that he isn't.
Enjambre is a band from Mexico, recognized for their distinctive rock sound. Throughout their career, they have released a number of albums, building a dedicated following.