Saw a few posts here and in other forums on the subject of markers. Can be a little pricey at the garden centers especially if you plant as many varieties of vegetables, annuals and perennials as I do.

Purcahsed a plastic venetian blind that was in the bargain bin a few years back. Might have paid $2.

I cut the individual slats (or a few held together) even with scissors that haven't been sharpened in a while, in any length I want (just a few inches for shallow pots), and on the diagonal so they insert easily through the soil, on which is marked the plant variety with a sharpie or pencil.

I've been using the same blind for a few years and have plenty left for the next few years. I suppose you could use the markers again if you remove the sharpie with a solvent, or with an eraser if marked in pencil.

I use the same venetian blind as markers outdoors to distinguish one tomato variety from another. I punch a hole in the top of one with a paper punch, attach a piece of the green plastic coated wire available in hardware stores and twist this on to one of the wires of my tomato cages. Each is marked in pencil because I find that sharpie fades in the sun. Rust will bleed on the marker from the tomato cage wires eventually but this helps me keep track of the variety before fruit set and ripening at which time the variety is obvious. I do keep a garden plant/plot drawing but its kept filed in my desk drawer and inaccessible when I'm in the garden wondering what I planted where.

I suppose the drawing could be laminated and kept in the barn but I probably will never reach that level of organization although that would eliminate having to mark each plant.