Latt...
I have some now that are 6 years old, several 5, 4, 3, etc...
I remember years ago when you were saying 10% survival and I was doubting that...
Now unfortunately I have to confirm you were right. That is about where most of my older patches are (5 and 6 year olds).
Now my ground and calcium levels are not even close to what you have, but my results on survival have been very similar.
I have several beds where I planted 5'x 50' beds... and along that 50' length, the majority of the survivors will be in one location, perhaps on one end or the other rather than being evenly dispersed along that length. Where they did well, they did well, but where they did not, they did not.
I am happy to have what I have though and now after 6 years of planting, I have several plants that are making berries now, and that is going to get better each year now.
I have faith in those plants that lived and produced berries, that those berries will do well. I expect them to do much better than the original shade grown cultivated seed did.
TNHunter