The first sentence plays a small trick. "Standing outside my front door on this rainy night is the closest thing to a son or daughter I'll ever have." The syntax holds back its subject, so for a moment we picture a person waiting in the rain, a child perhaps, locked out or late. Then the colon delivers an eastern red cedar. The reader has already felt what the speaker feels, which is that this tree is a stand-in for something else. The title does the same work. "Off spring" splits the word "offspring" in two, and the gap leaves it slightly off, not quite the real thing. It also hints at "spring" in the plant sense, a shoot or sapling. I'd read this as an inference, but the pun suits a poem about a substitute family member.
This is a prose paragraph followed by a three-line verse, a combination that recalls the haibun tradition. The prose is deliberately unpoetic. There is no rhyme and no regular rhythm, only the loose, digressive voice of someone telling a story on the porch. Its details are precise and modest: the tree was "one or two years old," transplanted "back in 1993," and the speaker prunes the branches that "rub against the roof." That plainness makes the opening admission hit harder. "I'll ever have" is stated without self-pity, almost as a fact of housekeeping.
The paragraph is built as a loop through time. It begins on a rainy night, jumps back to 1993, then further back to a childhood home in Maine with juniper bushes in a former pasture, and finally returns to the present with stormy nights. The speaker explains that a "closely related species" by the door appealed because of those childhood junipers. Eastern red cedar is in fact a juniper, so the tree really is kin to the bushes the speaker played among. The adult's chosen "child" thus reaches back to the speaker's own childhood, and the poem's family tree grows in both directions.
The humor and tenderness come from the parental tone. The speaker admits the tree has become "a bit of a monster, towering over the house," a phrase any parent might use about a teenager who has shot past expectations. "I still thought it would stay on the small side. It hasn't" is a rueful shrug, the sound of someone whose plans were politely ignored. Pruning becomes a kind of discipline, and the "delight of roosting songbirds" suggests the tree is generous in ways its keeper didn't plan. It shelters others, as a good parent or grandparent might.
The sound of the last sentence is the poem's best moment: "I hear it thump, thump, thumping against the house." The repeated word, with the verb stretching into its *-ing* form, imitates both wind-driven branches and a heartbeat. It could even be a knock on the door, which would echo the opening image of something waiting outside. Whether that is a comfort or an unease is left open. A child pressing against the house is both a nuisance and proof of life.
Then the haiku shifts the register entirely:
evergreen
adding our darkness
to the night
The "I" of the prose becomes "our." Speaker and tree now share something, and the shared thing is darkness. An evergreen is the darkest mass in a night landscape, and it never loses its leaves, so it is darkest in every season. That darkness can be read literally as a silhouette against the sky. Judging by the context, it may also carry the speaker's sense of absence, of a house without children, or of mortality. The verb "adding" is gentle, though. The two of them do not deepen the night so much as contribute to it, like voices joining a quiet chorus.
What makes the poem worth reading is its restraint. It could have been sentimental, a lonely person and a beloved tree, but the casual humor, the practical complaints about the roof, and the sudden compression of the haiku keep it honest. In a few lines it suggests that family can be improvised from whatever we tend over decades, and that what we tend ends up tending us back.