The Specimen Practicum
Ten modules teach you to read a plant. Proving you can read one takes a single specimen, twelve weeks and a notebook you actually keep. Finish it and you've earned the rank of Grower.
Reading the Apprenticeship will make you better informed. It won't, by itself, make you a grower. Knowing that roots need air is one thing. Noticing that this pot is staying wet four days longer than it did in June is a different thing entirely, and the only way across is to watch a single plant deliberately for long enough that the changes have somewhere to show up.
That's the whole practicum. Pick one plant and watch it properly for twelve weeks. Write down what you see and what you decide to do about it, and then, weeks later, whether you were right.
Nobody grades this but you. That's deliberate, and it's the part people find hardest, so the rubric below is built to make honest self-assessment possible: every requirement is a yes-or-no question about what is physically in your notebook, never a rating of how well you did. "Does my log contain a dated entry from before I intervened" has one answer and you already know it. "Was I observant" has whatever answer you're in the mood for that afternoon.
1Before you start
Choose the plant
Nearly any plant will do. What matters is that you walk past it anyway, ten times a day, without having to plan the trip. A plant in a spare room you visit twice a month gives you a thin log however good your intentions were in week one.
None of the following is required, but some specimens give you more to work with:
- Pick something that's actually growing. A plant pushing out new leaves gives you more to record than one sitting perfectly still all autumn.
- A little imperfection helps. A mild ongoing puzzle (a leaf that browns at the tip, growth that leans hard toward the window) gives your diagnostic attempt something real to chew on.
- If it came home last week, wait. It's still acclimating, and for the first month you'd be watching the nursery's conditions wear off instead of watching your own care do anything.
- A pot you can lift. Weighing the pot in your hand is half of this practicum, and nobody is hand-weighing a 40 lb (18 kg) planter twice a week.
Avoid anything you're currently worried about. A specimen in genuine trouble turns the practicum into a rescue, and rescues make you anxious, and anxious people water things twice and call it observation. Module IX is where rescues live. This is a different exercise.
Name it properly
Record the plant's botanical name (its two-part scientific name: genus and species, like Monstera deliciosa) plus the cultivar if it has one. If you bought it labelled "philodendron," spend the ten minutes it takes to find out which one.
This isn't pedantry. Common names will actively mislead you: "philodendron" gets stuck on plants from at least three different genera (true Philodendron, Thaumatophyllum, and Epipremnum, which is a pothos and wants different water and different light), and the label doesn't tell you which one you brought home. The binomial (that two-part Latin name again) is how you find care information written for the plant in front of you and not for something that vaguely resembles it. Of every habit in here, it's the one I'd keep if I could only keep one.
If you truly can't identify it, record what you know ("Philodendron sp., heart-shaped leaves, vining") and move on. An honest partial identification beats a confident wrong one.
Fix your photo position
Before the first entry, decide where you'll stand to photograph it and write the spot down. Same angle, same distance, ideally the same time of day. Then don't change it.
This sounds fussy. Do it anyway. Plants change slowly enough that you can't catch it happening in real time, and three photographs from an identical spot twelve weeks apart will show you things you looked at every day and never once registered. Photographs taken from wherever you happened to be standing show you nothing at all (ask me how I know).
2The six requirements
One plant, identified
A single specimen, recorded with its botanical name (genus and species) and cultivar where one applies, plus where in your home it lives and what it's potted in.
Twelve weeks, minimum
From your first dated entry to your last, at least twelve weeks have to pass. Treat twelve as the floor. It's roughly one seasonal turn, and that's deliberate: you want to catch the plant behaving differently as the light drops and the air around it dries out. A six-week log can't show you that, however diligent it is.
Longer is better. No ceiling, no deadline. Carry it across a full year and you've got the Season Log described at the end.
At least eight dated observations
Eight entries across twelve weeks works out at roughly one every ten days. Space them out. The 'keen fortnight' version, where eight entries land in the first two weeks and then ten weeks go quiet, tells you nothing about how the plant changed, and change over time is the entire subject.
An observation isn't a status report. "Looks fine" will tell you nothing in November when you're trying to work out what changed. Record what you can see and feel: turgor (how firm and water-filled the leaves are when you press one between your fingers), where the colour sits on each leaf and whether it's spreading, new growth or the lack of it, the weight of the pot in your hand, how far down the substrate has dried, what's happening at the leaf margins and at the substrate surface, and whether roots have started shoving out of the drainage holes.
Counts
“14 Sept. Pot noticeably lighter than last week; substrate dry about an inch (2.5 cm) down. Newest leaf has opened, paler than the others and slightly smaller. Two lower leaves yellowing at the margin, not the tip. No roots visible at the holes yet.”
Doesn't
“14 Sept. Watered it. Seems happy.”
That first one took ninety seconds to write. Ninety seconds is the whole bar. You can clear it standing in the kitchen with a mug in your other hand.
Three photographs from a fixed position
One near the start, one around the midpoint, one at the end. Same spot, same framing. Include something for scale if the plant is small.
Phone photos are entirely fine. Nobody is assessing the photography. The only thing that matters is whether the three images are comparable, and they're comparable only if you stood in the same place all three times.
One intervention, with your reasoning written down first
Somewhere in the twelve weeks you'll change something. You'll move it, repot it, start or stop feeding it, change how often you water, prune it, add a stake. Pick one of those and document it properly:
- Before you act: what you're seeing, what you think is causing it, what you're going to do about it, and what you expect to happen.
- After: what actually happened, at least two weeks later.
Do those in that order. Writing the reasoning down beforehand is what turns it into a prediction instead of a story you assemble afterwards to explain what already happened. Hindsight is extremely good at making us feel we knew all along.
“2 Oct. New growth for the last two months has been smaller each time and the stems between the leaves (the internodes) are stretching. I think it's short of light: it's about six feet (1.8 m) from an east window and the sun's getting lower every week. Moving it to within two feet (60 cm) of the same window. I expect the next leaf to come in closer to full size and the internodes to tighten back up. If nothing has changed in a month, light wasn't the problem.”
“28 Oct. Next leaf is noticeably bigger than the last two, though not full size. Internode gap looks about the same so far. Partly right. Keeping it there.”
The second entry admits to being partly wrong, and that's exactly what a good practicum entry looks like. If every prediction in your log came out right, you weren't predicting. You were describing.
One diagnostic attempt, using the method
Once, work a problem through the Module IX sequence: symptom, then hypothesis, then a test that would tell you whether the hypothesis is right. Start at culture (light, water, air, substrate, container) rather than at the spray bottle.
It doesn't have to be a serious problem, and you don't have to be right. A browning leaf tip will do, or one leaf behaving unlike every other leaf on the plant. What counts is that you followed the sequence and wrote it down, including the bit where the test came back and told you something you weren't expecting.
If your specimen genuinely presents nothing to diagnose across twelve weeks, congratulations, and do this on a different plant. Note in the log that you borrowed a subject.
3A log format, if you want one
None of this is required. Keep the log however you'll actually keep it: a paper notebook, a phone note, a spreadsheet, voice memos you transcribe later. The requirements are about content, not format.
If you want a structure, here's the shape I'd use:
| Date | Pot & substrate | What I see | What I did, and why |
|---|---|---|---|
| 14 Sept | Light. Dry ~1 in (2.5 cm) down. | New leaf open, paler and smaller than the last. Two lower leaves yellowing at the margin. Nothing at the drainage holes. | Watered through until it ran. Substrate was dry well below the surface. |
Two habits worth keeping whatever format you choose. Lift the pot every single time and note whether it feels heavy or light against last time, because your hands calibrate faster than you'd believe. And write down the dates you did nothing, not only the dates you acted. A gap in the log could mean anything. "18 Sept, checked, still damp, left it" is evidence.
4Score yourself
Six questions. Answer each one by looking at the log itself, page by page, and not by consulting your general sense of how it went. A generous answer costs nobody but you.
- Identified. The log opens with a botanical name, a location, and a note on substrate and container.
- Twelve weeks. First and last dated entries are at least twelve weeks apart.
- Eight observations. Eight or more dated entries, reasonably spaced, each recording something seen rather than something done.
- Three comparable photographs. Spread across the period, from the same position.
- One documented intervention. Reasoning and expectation dated before the change; outcome dated at least two weeks after.
- One diagnostic attempt. Symptom, hypothesis, test, result, following the Module IX sequence.
Six out of six is Grower
Not five. The six aren't a scoring range where more is better, they're the minimum shape of a practicum that means anything, and each one carries something the others don't. Without the fixed-position photographs you have no evidence of slow change at all. The before-and-after intervention is the only place your reasoning gets tested against what the plant actually did. And skip the diagnostic attempt and you've spent twelve weeks observing without ever committing to a conclusion.
If you come up short on one, you haven't failed anything. You've found the thing to do next. Keep the log running and close the gap. There's no deadline, no attempt limit, and we don't record how long it took.
5Submitting
When you can answer all six, email [email protected] with the log attached or pasted in, your three photographs, and a line confirming you've scored yourself against the six. You'll be recorded as a Grower. There's no fee, and there was never going to be one.
The register of specimens
The Guild keeps a public register of the plants people have carried through. Not a directory of the people, a record of the plants. An entry is the botanical name, the twelve-week span, and whatever name you want sitting next to it: your first name, your initials, a handle you like, or nothing.
Say in your submission how you'd like to appear, or say you'd rather not appear at all. Left blank, you aren't listed. Somebody landing on that page cold should be able to see that real people carried real plants through a real season, and a run of species names does that better than a column of strangers' surnames.
The Season Log
Twelve weeks catches one seasonal turn. A full year catches all four, and that's a different order of understanding: you'll watch the same plant want completely different things in February and July. Mostly you'll stop carrying your summer assumptions into winter conditions, which is how a lot of houseplants end up sitting in cold wet substrate for six weeks wondering what they did to deserve it.
Carry the same log for twelve months, keep the same photo position, and you have a Season Log. It's optional, it's a second-year thing, and it earns you nothing extra toward Grower, which you already hold at twelve weeks. Details will follow once there are Growers to write them for.