This is so unlike me but I bought a Scarlet Sentinel columnar apple tree without pre-purchase research.
Now I'm having trouble finding much reliable info about it. Someone said it doesn't taste good but at the same time said no apple is any more disease resistant than another, which instantly made me question the validity of any statement. I gave up after the last website claiming to be all about apple cultivation said it's self pollinating but should be planted with other trees - even cherries or peaches.
I'm pretty sure the articles and descriptions claiming to be self pollinating were written with inadequate research and are mistaking Scarlet Sentinel which is supposed to be a regular apple (needing cross pollination) with Red Sentinel crabapple (self pollinating).
Some sites describe it as needing another columnar apple to cross pollinate, and others say any other apple or any others on their apple selection list "except Gravenstein, King or Jonagold". (This actually sounds *most* likely and Enterprise *is* on their list. They describe Scarlet Sentinel as "Very sweet, juicy, crisp, pure white flesh")
So, I have to decide if this Scarlet Sentinel should go on one side of the house near the semi dwarf Enterprise with a wild crab apple towards the back of the property (which is most likely pollinating the Enterprise) or on the other side of the house near the espaliered Pristine and Arkansas Black.
Unfortunately, there is no room in the espalier fence row or I would definitely have planted it there, but I could plant it nearby.
Enterprise side is relatively close to the neighbor's Eastern red cedar trees and even the super disease resistant Enterprise suffers cedar-apple rust on some of the leaves, and an Amelanchier that I thoughtlessly planted between Enterprise and the wild crab loses most of its fruits to it, though its foliage appears immune/able to fight it off.
Any ideas or help locating reliable info source would be greatly appreciated.