Most poems about the past are tender toward it. E. H. Johnson's "Dry Rot" is something else: a warning, almost a diagnosis. Its speaker confesses to hoarding "too much of Yesterday" and then spends three stanzas working out what that hoarding has cost. The central idea is simple and a little unsettling. Memory is valuable, but only when it feeds the present; kept in excess, it stops being a possession and becomes a danger.
The title does much of the work before the poem begins. Dry rot is a fungal decay that eats timber from the inside, often while the surface still looks sound. That is exactly the situation the speaker describes. The heart has "secret chambers," a phrase that makes it sound like a house with locked rooms, and the speaker has been filling those rooms with the past. Nothing dramatic has happened yet; the fear is that the structure "may break apart, / Sapped of its strength by dry decay." The word "sapped" is a good choice, since it suggests something drained quietly and gradually, the way sap leaves a dying plant. Johnson is describing a process, not a catastrophe, and the quiet slowness is what makes it frightening.
The second stanza sharpens the argument with its most memorable line: "phantoms are not friends." Here the stored memories are no longer timber but ghosts. A phantom looks like company but cannot answer back, change, or surprise you. The speaker has learned this the hard way, and the verb matters: "I have learned" turns the poem into a lesson earned through experience rather than a piece of borrowed advice. The consequence follows with grim logic. Without "new dreams," the heart can only foresee "a dead tomorrow as each gray day ends." Notice how the future itself is infected by the same decay; tomorrow is already dead, and the days are all the same dull color. Someone who lives entirely in yesterday has, in effect, no other day available.
The final stanza turns from private confession to general principle. "Today is for the living heart, -- the brave" sets up a contrast between living and hoarding, and it quietly attaches a moral value to it. Bravery here means facing the present without the cushion of what has already been. The closing image completes the poem's metaphor of decay: "Our treasure turns to wormwood and to gall." Wormwood and gall are both proverbially bitter, so the thing we thought we were protecting sours in our hands. The pronoun shift from "I" and "my" to "we" and "our" in this last stanza widens the poem's reach, inviting every reader to recognize the same temptation in themselves.
Formally, the poem is tidy and controlled, which suits an argument about balance. It uses three quatrains rhymed ABAB: "heart" and "apart," "Yesterday" and "decay" in the first stanza, with the pattern repeating in each that follows. The lines run in a steady, roughly iambic rhythm, with a relaxed rise and fall that gives the voice a calm, reflective tone. A slight irregularity in the line lengths, with the second and fourth lines indented and a little shorter, produces a gentle falling-off at the end of each stanza, as if the sentence were running out of energy. That fits the subject. The one punctuation oddity, the dash that follows "the living heart," puts a small pause before the word "brave" and gives it extra weight.
What makes the poem worth reading is its honesty about a temptation that is easy to excuse. Nostalgia feels like loyalty, even like love, and Johnson does not deny its pull; the speaker is not scolding someone else but admitting a personal fault. The poem's quiet insight is that preserving the past too carefully is a way of failing the present. Its images of rot and bitterness are blunt, but its conclusion is not hopeless: the very act of recognizing the problem suggests that the heart can still be aired out, opened, and put back into use.