I bought a monkey puzzle tree around a foot high and planted it in a very
large tub in my garden in the north of scotland, I have seen other mature
trees around my area so know that they will grow.

It seemed to be ok and looked like new growth was slowly happening but just
lately i have noticed that the ends of a few of the fronds ( sic ) have gone
brown for about an inch or two and look like they are rotting, if i touch
them the brown spiky leaves come off in my hand.

Could I have overwatered or should so young a tree be indoors in our winter
?

TIA
Bob