Tough strawberry question - PVC tower spacing
I have two 8" internal diameter PVC pipes that I'm going to fill with growing medium and plant strawberries growing up (5 feet of tower will be above ground).
How big should I drill my individual strawberry holes? I've seen 2" used in web searches, but that seems big to me.
More importantly, what kind of spacing between holes (horizontally and vertically) should I employ? This is the bigger question to me - it clearly impacts how many I plant (and how many holes I drill).
20' section of the cell core PVC was $120; I had it cut down to 2 8' sections (3' in the ground) and 1 4' remainder that I may additionally use on the deck.
I have included a link to a commercial version of my goal.
All thoughts welcome.
Here is a link that might be useful: A Commercial Version of Strawberry Tower