Andy Matuschak coined the term "evergreen notes" to describe something precise and demanding: notes written to be developed over time, connected to other notes as understanding deepens, and treated as living documents rather than archived records. The concept is sound. The practice, as it has been adopted, is almost entirely the opposite of what he described. Most people write evergreen notes once, file them carefully, and never return. The notes do not grow. They accumulate. And accumulation is not the same thing as knowledge.
There is a particular irony embedded in the concept of the evergreen note that its enthusiasts rarely acknowledge.
The word "evergreen" is a biological metaphor. An evergreen tree retains its leaves through winter — it continues to live, to exchange gases, to draw water, to grow imperceptibly — when the deciduous trees around it have shut down and gone dormant. The metaphor implies continuous life. An evergreen note, in the sense Andy Matuschak intended when he developed the concept on his working notes website, is one that participates actively in an ongoing intellectual process: being returned to, revised in light of new understanding, connected to other notes as the web of thought becomes denser, and developed over months or years into something qualitatively richer than what it was when first written.
What most people who adopt the vocabulary of evergreen note-taking actually create is closer to pressed flowers. The note is written at the moment of encounter with an idea, with care and intention, and then placed in a system where it will be preserved indefinitely. It will not decay. It will not be lost. But it will also not grow, because nothing living will be done to it. The person who created it will move on to the next idea, write that note with equal care, file it with equal precision, and continue accumulating a collection of carefully preserved, perfectly static impressions.
The difference between these two things — the genuinely evergreen note that develops over time and the pressed-flower note that merely persists — is not a matter of design or technology. It is a matter of practice. And the practice that transforms a note from static to living is revisitation: the act of returning to a note, engaging with what you wrote, finding it inadequate or incomplete or differently understood from what you now know, and doing something about that.
This is the practice that almost no one maintains. And its absence renders the entire framework of evergreen note-taking largely decorative.
What Matuschak Actually Proposed
Before examining the gap between the concept and its adoption, it is worth being precise about what the concept actually involves.
Matuschak's working notes — a publicly accessible collection that has become one of the more carefully observed examples of personal knowledge management in practice — describe evergreen notes as having several specific properties. They are written in complete sentences rather than bullet points or fragments, because the act of writing a complete sentence forces a degree of precision and commitment that fragmented notes do not require. They are atomic: each note captures a single idea, precisely enough that the title of the note can function as a claim rather than a topic heading. They are connected: the note exists not in isolation but in explicit relationship to other notes, with links that represent genuine conceptual relationships rather than loose thematic proximity.
But the most important property, and the one most frequently omitted from summaries of the approach, is the developmental one. Matuschak writes, in the note titled "Evergreen notes should be concept-oriented," that the point is for notes to accumulate and become denser as your understanding of the concept develops. The note written today is not the finished product. It is the beginning of a conversation with yourself that may extend over years. You return to the note when you encounter new evidence, when you find that your understanding has shifted, when you discover a connection to an idea that was not in view when you first wrote it. The note is a site of ongoing intellectual work, not an archive of completed work.
This is a demanding practice, and Matuschak does not pretend otherwise. He notes, with characteristic directness, that maintaining a set of truly evergreen notes requires prioritising quality of engagement over quantity of capture — and that this means writing fewer notes, more carefully, and returning to them more often than most note-taking systems encourage.
The PKM community, which encountered this framework largely through secondhand descriptions and through the affordances of tools like Obsidian and Roam Research, absorbed the vocabulary without absorbing the practice. The insistence on atomic notes and complete sentences was adopted readily — these are observable formatting choices that can be implemented immediately. The developmental, revisitation-based aspect of the practice was adopted in principle and abandoned in practice, because it is invisible, uncomfortable, and yields no immediate reward.
The Psychology of Capture Over Revisitation
Understanding why revisitation is so consistently neglected requires understanding the psychology of the note-taking moment — the moment of capture — in relation to the psychology of the revisitation moment.
The moment of capture is almost always accompanied by positive affect. You have encountered something interesting, important, or useful. You are engaging with material that has activated your curiosity. The act of writing it down feels productive: you are doing something with the idea rather than merely having it pass through your awareness and disappear. There is the particular satisfaction of the newly created note — neat, complete, filed correctly — that belongs to the family of feelings associated with task completion. The inbox is now empty of this item. It has been handled.
This is a small reward, but it is an immediate one. And immediate rewards, as the research on habit formation consistently demonstrates, have disproportionate influence on behaviour relative to delayed ones. The note-writing habit is reinforced every time it produces this feeling of productive completion.
The revisitation moment has none of these properties. You are returning to something already written, which means there is no novelty. You are engaging with a note that may now seem less interesting than the new ideas you have been encountering since you wrote it. You may find that the note is wrong, or incomplete, or that the connection you saw at the time of capture was less significant than it seemed — all experiences that are mildly aversive rather than rewarding. And the reward for doing the work — the gradual densification of your understanding, the slow emergence of a more sophisticated intellectual structure — is delayed by days, weeks, or months. There is no clean signal of completion. The note is not done; it is merely more developed than it was, and even the judgement of how much more developed is difficult to make from the inside.
The result is a persistent asymmetry: capture is reinforced constantly, revisitation almost never. Over time, the ratio of new notes to revisited notes in most systems approaches infinity. The collection grows. The conversations with existing notes do not happen.
The Forgetting Curve and Its Implications
The cognitive science of memory provides a useful frame for understanding what the failure of revisitation actually costs.
Hermann Ebbinghaus's nineteenth-century research on the decay of memory produced the "forgetting curve" — the now-famous finding that retention of material drops steeply in the hours and days following initial exposure, and continues to decline more gradually thereafter unless the material is re-encountered and re-encoded. The rate of forgetting is not uniform; material that is deeply processed at encoding decays more slowly than material that is superficially processed. But even deeply processed material will eventually become difficult to retrieve if it is not revisited.
The implication for note-taking is direct: a note written and never revisited is a note that marks the beginning of a forgetting process, not the prevention of one. The note preserves the propositional content of the encounter. It does not preserve the understanding. And understanding — the rich, connected, functional knowledge that allows a concept to be used rather than merely stated — decays faster than propositional content, because it depends on active cognitive structures that must be periodically refreshed to remain available.
Spaced repetition, the learning technique derived from Ebbinghaus's work, addresses this by scheduling re-encounters with material at precisely the intervals that research has shown to be optimal for consolidation. The material is revisited just as it is about to decay from memory — which is the moment when retrieval is hardest and re-encoding is therefore most effective. The practice is demanding in a precise way: it requires engaging with material at intervals that feel inconveniently arbitrary, in a context where you are often far from where you were intellectually when you first encountered it.
The genuinely evergreen note-taking practice, as Matuschak describes it, has a structural resemblance to spaced repetition: material is revisited, engaged with actively, updated in light of developments in understanding, and connected to new material that has accumulated since the last visit. But unlike spaced repetition software, which creates the revisitation schedule automatically and makes it difficult to avoid, the evergreen note-taking practice depends entirely on the practitioner's willingness to return — which is to say, it depends on the practitioner's ability to maintain a practice that offers no immediate reward and requires consistent resistance to the pull of novelty.
Very few people can do this without structural support. The question is whether the tools and systems being built to support note-taking are providing that support, or whether they are optimised for the capture experience at the expense of the revisitation practice.
The Tool Problem
Most note-taking applications are designed around the creation of new notes. The interface encourages capture: a new note is always one click or one keystroke away. The visual presentation of a growing collection — the expanding tree of folders, the multiplying nodes in the graph view — creates the impression of intellectual accumulation that reinforces the habit of capture.
Revisitation, by contrast, is structurally buried in most tools. There is no reminder to return to notes written three months ago. There is no mechanism that surfaces notes whose content is being contradicted or complicated by more recently written notes. There is no prompt that asks "you wrote this six weeks ago — is it still what you think?" The graph view shows you what is connected but not what is being neglected. The search function finds notes by keyword but does not find notes by age, or by the criterion of having been written but never subsequently developed.
The effect is that the tool's design reinforces the same asymmetry that the psychology of the note-taking moment reinforces: capture is easy and rewarded; revisitation is hard and structurally discouraged.
This is not an oversight. It is the product of an industry whose incentive structure rewards engagement metrics and feature adoption. New note creation is a trackable, demonstrable user action. The development of existing notes over time is not trackable in any straightforward way, and "our users revisit and deepen their notes" is not a metric that appears on the dashboards that drive product decisions.
The result is a class of tools exquisitely optimised for the experience of building a note-taking system — an experience that is genuinely enjoyable, that produces a convincing artefact of intellectual activity, and that is largely decoupled from the development of genuine intellectual understanding.
What Revisitation Actually Requires
If the tools do not provide structural support for revisitation, and if the psychology of the note-taking moment actively discourages it, what would it take to maintain the practice genuinely?
The first requirement is a different relationship with the idea of completion. The note-taking system that treats the act of writing a note as the completion of an intellectual transaction — the idea has been captured, filed, and handled — creates an incentive to create notes and never return. A system that treats the initial capture as the opening of an intellectual transaction, not its completion, creates the opposite incentive structure. The note is not done. It has been started. The question is what it will become.
This is a significant psychological shift, and it requires actively resisting the sense of closure that the act of writing a note naturally produces. The note that has been filed is not a finished product. It is a debt: a claim that this idea is worth developing, that the encounter was worth preserving, and that you will return to it and do the work of development that the initial capture did not complete.
The second requirement is a regular practice of what might be called structured wandering through the existing collection — not searching for specific notes to answer a specific question, but browsing without a destination, encountering old notes with the fresh eyes of someone who has continued thinking since the note was written. This kind of revisitation is different from retrieval: retrieval is purposive, directed at finding something you know you want. Structured wandering is open-ended, oriented toward finding what is worth developing or connecting in the light of current understanding.
This practice is uncomfortable in a specific way. It requires tolerating the experience of encountering your own past thinking and finding it inadequate — notes that were written with confidence but are now clearly incomplete; connections that seemed important but now seem trivial; formulations that were once precise but have since been superseded by better ones. This experience is mildly aversive in the way that all genuine self-examination is mildly aversive. The person who avoids it is not lazy; they are responding to a real cost. The person who builds the practice is not unusually disciplined; they are unusually convinced that the cost is worth paying.
The third requirement is a willingness to delete, revise, and merge notes rather than simply adding new ones. The evergreen note collection that is genuinely developing will look different over time not merely because it has grown — new notes added — but because it has changed. Notes will be rewritten in light of new understanding. Two notes will be merged into one that is more precise than either. A note that was once considered important will be deleted when it becomes clear that it was capturing a superficial impression rather than a genuine insight.
This is the most demanding aspect of the practice, and the one most completely absent from popular accounts of evergreen note-taking. Most systems optimise for preservation. The genuinely developmental practice requires the willingness to destroy what is no longer adequate — a willingness that the archive mentality, with its emphasis on never losing anything, actively works against.
The Real Measure of an Evergreen System
If revisitation is the practice that distinguishes a genuinely evergreen note collection from a well-organised archive, then the correct measure of an evergreen system is not the number of notes it contains. It is something more difficult to quantify: the proportion of existing notes that have been actively developed since their initial creation.
A collection of a thousand notes, five percent of which have ever been revisited and developed, is not an evergreen system. It is a large archive with an evergreen aesthetic. A collection of two hundred notes, eighty percent of which have been returned to multiple times and grown substantially from their initial versions, is much closer to what the concept describes.
This is a useful heuristic for evaluating your own practice, and an uncomfortable one. Most people who consider themselves to be maintaining evergreen note systems will find, on honest examination, that their revisitation rate is very low — that most of what they have written has been written once and never touched again, and that the graph of connections between notes, however visually impressive, represents connections made at the time of writing rather than connections discovered and refined over time.
The discomfort of this realisation is productive if it prompts a genuine reconsideration of the practice. The question worth asking is not "how do I make my note-taking system more evergreen?" — a question that tends to produce answers about formatting and linking conventions — but "what would I have to do differently to actually revisit and develop what I have written?" This is a question about time allocation, about habit formation, about the psychological relationship with existing work versus new work. It is a more uncomfortable question, and a more useful one.
The Connection to Understanding
The deeper reason why revisitation matters — deeper than the cognitive science of the forgetting curve, deeper than the psychology of habit formation — is that revisitation is the mechanism by which captured content becomes genuine understanding.
Understanding, as previous essays in this series have argued, is not a property of content. It is a property of the relationship between content and the cognitive structures of the person engaging with it. A note that was written at time T represents the state of understanding at time T: the connections that were visible then, the implications that were apparent then, the confidence level that was warranted then. The person at time T+1 year, who has continued thinking, has read more, has encountered counter-arguments and confirming evidence and adjacent ideas, has a richer and more accurate network of cognitive structures. When this person revisits the note from T, they are bringing a different mind to the same material — and the act of engagement between the richer mind and the earlier note is where development happens.
The note that is never revisited represents the state of understanding at the moment it was written, permanently. The understanding develops in the person — they continue thinking, learning, encountering new material — but the note does not track this development. The gap between the note and the person's actual current understanding widens, silently, indefinitely. The note becomes a historical document rather than a living one. And the person, if they return to it years later, may find it embarrassingly incomplete — not because the initial capture was done carelessly, but because it was done by a version of themselves who knew less and thought less precisely than they now do.
This is what it means for a note to fail at being evergreen: not that it decays, but that it fails to grow. The person grows. The note does not. And the disconnect between them is the lost opportunity cost of the revisitation practice that was never built.
What a Genuine Practice Looks Like
There is no single correct implementation of a revisitation practice, and this essay is not intended to prescribe one. But the structure of what such a practice requires is clear enough to describe in general terms.
It requires designated time that is explicitly protected from new capture. The person who makes time to revisit their existing notes only when they have completed all new capture they are interested in making will never revisit. New material is always available. The appetite for new material is functionally unlimited. The revisitation practice must be scheduled rather than residual.
It requires a trigger mechanism that surfaces old notes independently of the practitioner's active choice to seek them out. This might be a random note surfaced daily by the tool, a scheduled review of notes written in the same period in previous years, or a deliberate practice of reading through a set of notes on a topic before beginning new reading in that area. The specific mechanism is less important than the consistency of the trigger and its independence from the practitioner's moment-to-moment motivation.
It requires a different question than the one that drives new note creation. The question at capture is "what is worth recording?" The question at revisitation is "what has changed since I wrote this?" — what do I now know that complicates this note, what connections do I now see that I did not see then, what formulation would now be more precise than the one I used, what was I getting wrong or missing when I wrote this? This question is harder and less comfortable than the capture question, and it is the one that produces genuine development.
And it requires, above all, the intellectual courage to find your own previous thinking inadequate and to say so — to revise, to delete, to replace, rather than merely to add. The collection that only grows is not a system that is developing. It is a system that is accumulating. And the difference between development and accumulation is the difference between a mind that is genuinely becoming more sophisticated and one that is merely becoming better stocked.
The evergreen note that is never revisited is not an evergreen note. It is a pressed flower: perfectly preserved, permanently static, and as distant from the living thing it resembles as the archive is from the understanding it was supposed to contain.
Aethel is built around the assumption that intellectual development is not a property of what you capture but of what you continue to engage with. The DAG records every exchange. The question is what you do with the record.