The one line meant to be read is about a plant
Seven items in a taught, legible hand, three already ticked off, and the only line meant to be read is an instruction for a plant rather than a person.

Seven items run down a sheet of lined notepaper, in an older hand with strong, deliberate downstrokes. Six are close and quick, written for nobody but the person who wrote them. The seventh sits apart, plainly formed: don't forget the water. Three items already carry a small hand-drawn tick.
The list was written for two readers, and only one line of it was meant for you.
Why is only one line on the list actually legible?
Because six of the seven items were never written to be read by anybody else, and this design keeps that fact rather than smoothing it over.
A list like this is mostly a private working document — a reminder to the writer, in the writer's own shorthand, of what still needs doing before you arrive or after you leave. The plant line is different: it's an instruction handed to a second person, so it slows down and squares up. The same page carries both registers, and the design draws that difference rather than translating the six private lines into something a stranger could read. Translating them would turn a private note into a caption.
Why does the writing change so sharply for one line?
Because it's a taught hand doing two different jobs, and only one of those jobs was ever meant for an audience.
The strong downstrokes across the whole sheet belong to somebody who learned to write when legibility toward other people was a basic courtesy, not a stylistic choice. Most of the list uses that skill loosely, at speed, for private use. The line about the water uses it properly, at full formality, because it's the one sentence on the page addressed to you rather than to the list itself. The same hand can do both; which one it does tells you who the sentence is for.
What do the ticks mean, and who put them there?
They're the writer's own record of what's already been done, not a checklist left for you to work through.
A tick added by the person reading a list usually means "completed, moving on." A tick added by the person who wrote it means something closer to "already handled, don't repeat it" — three jobs quietly taken off your plate before you got there. It's a small, unannounced piece of housekeeping, the kind of thing that only shows up if you happen to look at the page twice.
Whose handwriting is this, and is it alright to print?
It's the hand of whoever wrote the list, and that's worth a conversation with them before it goes on a shirt, the same courtesy an envelope addressed in the same taught block capitals is worth extending.
A lined page with seven items and a tick isn't owned by anybody — plenty of people keep lists this way. What belongs to one specific person is the particular slope and weight of their own hand, and whether they want it reproduced. Most people asked are pleased rather than precious about it; the conversation is short and the usual answer is yes.
Is the water line about the same plant you're eventually sent home with?
Not necessarily — the water line covers whatever's inside the house while you're looking after it for an afternoon, where the cutting you leave with, roots already showing is a different object with a different job: one stays, one travels.
They're the same habit wearing two shapes. A plant that has to be watered on schedule is a standing responsibility handed to you in writing; a cutting pressed into your hands at the door is the same care, given away rather than delegated. The list only ever carries the first kind.
Does the same trick work for a list that isn't about a plant?
Yes — the mechanism is the ratio between what's private and what's addressed to you, not the plant itself.
Six numbered instructions on a kitchen worktop, five illegible and one added as an afterthought runs the identical structure on a different sheet: most of a page written for the writer alone, and one line that briefly turns and speaks to somebody else. Any list with that ratio will draw the same way, whatever the one legible line says.
Does it print well?
Yes — a single ink carries the whole sheet, and the contrast the design needs is already built in: tight illegible strokes against one line drawn open and evenly spaced.
Keep the downstrokes firm rather than looping them into something softer — a taught hand has more angle in it than a casual one, and rounding it off would flatten the exact quality that makes the water line read as deliberate. Bone or another pale tee keeps a dark single ink legible without needing a second colour anywhere.
How do I get one made?
Describe the list at JustOG — how many items, which one is legible, whether any carry a tick.
Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Six items got done or didn't; the plant, apparently, could not be trusted to either of you.