A straight row exists so you can hoe between it
Two pegs and a taut string keep a row dead straight for a whole season — not because a straight row grows better, but because a straight row is one you can hoe between without wrecking anything.

Two wooden pegs, driven into soil at either end of the shirt. A string runs dead straight between them, full width. Along one side of it, a shallow drill has been scored into the ground. The soil everywhere else stays rough.
The cheapest tool in a garden, and it decides how the whole season goes.
What is actually being marked out here?
A single straight line, held taut between two fixed points, that a drill is then cut alongside.
The string itself doesn't touch the soil — it hangs just above it, and its job is to give a hand holding a hoe or a trowel something to follow that a freehand line never quite manages. The drill, the shallow trench the seed actually goes into, is cut with the string as a guide and then the string comes up and moves to the next row.
Why does a straight row matter more than a straight-looking one?
Because what the line is really setting up isn't the row itself, it's the gap next to it — and that gap has to stay wide enough and even enough to get a hoe down for months afterwards.
A row that wanders even slightly means the gap beside it wanders too, narrowing in places to less than a blade's width. The angle a hoe blade is built to work at assumes a clear run to push through; a crooked row turns every pass into a series of careful stabs around whatever's growing too close to the edge.
What makes a good drill line — depth, or straightness?
Straightness first, because depth is forgiving in a way a wandering line isn't.
Most seed will tolerate a drill a little deeper or shallower than ideal and still come up fine. A row that drifts off true doesn't get a second chance once anything's growing in it — there's no way to straighten a row of seedlings without disturbing half of them, so the string has to do its job before a single seed goes in, not after.
Who owns the idea of a string line?
Nobody. Two fixed points and a taut line between them is one of the oldest marking-out methods there is, used the same way in building and surveying long before anyone applied it to a vegetable bed.
What could be owned is a specific manufacturer's line-and-peg set, sold as a product with its own branding — ordinary licensing, if a real one were the point. Left as two plain pegs and a length of string, it stays a description of a method rather than an object anyone made and sold first.
Does this work for anything other than a vegetable row?
The same two pegs and a string are used for setting a straight edge on a lawn, aligning a path, or squaring off a bed before digging — anywhere a straight line is wanted on ground that has no lines of its own.
What changes isn't the tool, it's what follows it. A vegetable drill gets a hoe run beside it all summer; a lawn edge gets cut once and left. A wigwam of poles goes up on the same open ground for the opposite reason — pure structure, put up once, then left alone until it's invisible under growth.
Isn't obsessing over a straight line just neatness for its own sake?
It reads that way from the outside, which is probably why it gets dismissed as fussiness more often than any other step in sowing.
The line isn't there to look neat from a gate or a photograph. It's there for whoever's crouched over that row in six weeks with a hoe, trying to get the blade close to the plants without going through them — and a line that was straight to begin with is the only thing that makes that possible without a second thought.
Does it print well?
Yes — a single unbroken diagonal or horizontal across the full width is one of the strongest shapes a print can carry, and it needs almost nothing else to work.
Keep the string as one clean, taut line rather than a slightly sagging one — tension is the entire visual argument. Orange for the string and the drill scored beside it against charcoal keeps the eye on the line first; the rough soil either side can stay a looser, more textured mark without competing for attention.
How do I get one made?
Describe the line at JustOG — how long, how the pegs sit, and how rough to leave the ground either side. 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.
One string, two pegs, and a season of hoeing that goes cleanly because of it.