Two people, two small preferences, and a quiet joke about how they fit together. The speaker likes the smell of lilac in winter. The other person, "you," likes mint in spring. The subtitle, «We go together apparently», tells us how to read the lines: someone has remarked that these two belong side by side, and the poem is half-teasing, half-curious about why.
Nothing about the pairing looks obvious. Each scent is tied to the wrong season, or at least a different one, since the speaker's lilac is wished for in the cold and the other's mint belongs to a fresher time of year. The word "apparently" suggests the speaker is a little amused, maybe a little unsure, passing along what others see rather than claiming it outright. The mood is light, gentle, and slightly wistful. Smell is tied closely to memory and longing, so the poem hints at affection without ever stating it. The couple fit because they like different things, and the poem leaves that to us.