I have six of Curtis' seedlings from Spring of 2021. Five out of six have some form of very minor neagari, entirely by accident. I'm not saying any of these neagari look good, I'm just saying that they developed some form of neagari, or at least the start of what could someday become neagari
. For reference, I've also included a photo of the one that doesn't have any neagari, at least not visible above the soil surface.
My hypothesis for how the neagari developed is that I have these growing in 100% pumice, which is a bit on the dry side, especially for a climate like Utah. So, I've found that they tend to send their roots straight down to moisture, and often out the bottom of their pots into the ground. Then, when I repot, I probably pot them a bit higher than the previous year, which exposes some roots. Neagari wasn't my goal for these, and for some, I want to get a wider spread of roots in coming years.
Each photo below is of a different tree.