Cuttings Failed. What Now?

I have a propagation failure to show you. It's not a big, spectacular failure like the cuttings melting down with rot, or dropping all their leaves and crisping up. In fact, these blueberry cuttings seem quite happy to stay green and relatively plump, but there's little sign of pull-back (rooting) or callus. Let's take a closer look...

It's important, I think, to note that I may not yet have the solution to the problem even after this closer look. What I have is a little more information, and the makings of another attempt. Plant propagation is all about persistence. While many plants will root from stem cuttings with the same basic conditions and methods, other plants can be quite particular about the stage (ripeness) of wood, temperatures, time of year, rooting hormone. In short: each plant can be a little different. My modest (but non-zero!) success rate only serves to motivate additional attempts.

If interested, here's a link to that study I was looking at on blueberry cuttings:
https://www.agricultforest.ac.me/data/20180930-07%20Braha%20and%20Petrit.pdf

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