Kigi Nursery
https://kiginursery.com/dwarf-miniatures/pinus-strobus-blue-shag-dwarf-eastern-white-pine/
currently has 1 year old grafts for $40
nursery is good for the material they send. Note - a one year graft is young, it will need a lot of time, 5 to 10 years from graft to get a plant like the one the
@BuckeyeOne posted. $40 is a little steep for a one year graft, but it is not totally out of line. It is not a common cultivar.
Kigi in the description calls it by the wrong name (Sea Urchin) but the description Kigi has for 'Sea Urchin' is different than the one for 'Blue Shag', and I checked the MoBot website and their description of 'Blue Shag' matches the Kigi description in enough details that I'm pretty sure the Kigi description is correct, justy that in typing the description someone called it the wrong name. Which means - walk very slow with this plant if you want to try to bonsai It. 'Blue Shag' is not, definitely not a good specimen for a beginner.
Reasons
It is a dwarf bordering on the definition of a miniature. It grows only 2 to 4 inches a year. Size at 10 years is 2 feet x 2 feet. Why is slow growth a problem? If you have trouble leaving a tree alone for a year to recover, try leaving it alone for 2 or 3 years.
Pruning to style - If your styling requires growing a new branch here or filling in there, instead of waiting a year or two - you might have to wait 5 or 10 years.
So when you style a slow growing dwarf, basically you try to keep absolutely every bit of foliage possible. Don't cut off anything you might want to fill back in, because it won't, at least not in reasonable time. Just wire up what you have, take off the least amount possible. And do not plan on it growing a branch here, or filling in there.
The description sounds like it becomes relatively dense over time. This may mean it produces multiple buds (similar to the 'yatsubusa' forms of some Japanese pines. This may be good long run, depending on whether you keep it growing fast or whether you do something to slow it down.
If / when you repot it, plan on more than 12 months for the tree to recover. Likely 24 to 36 months. Wait until you see lots of candle expanding in spring. THen you know it has recovered. No pruning while waiting for recovery from repotting. Wiring in late summer, autumn is okay.
SO while dwarf conifers may look cool for bonsai, make sure they grow 4 or more inches a year, preferably more than 6 inches a year. That way you can actually get growth you can work with to style and train your tree.
Good luck, I would just let it grow at least one year just as it is, in that pot. Measure, or mark several branches, and see how much it actually grows for you. Maybe I'll be wrong, and then you can do a more typical styling on it.
