The first thing I noticed is that you are in zone 3A Canada, and I am in zone 8A Texas. I thought to myself, "How can any advice or info that I know help you?" I looked up info anyway.
When I looked 'Lutz Green Leaf' beet up I found many seed selling sites. By what all I read, I think it may not be a German variety per se, but a European variety instead. This site
https://www.fedcoseeds.com/seeds/search?item=2170 pretty much agrees what I think. It sounds like a good tasting beet with a long storage life.
I have only grown Detroit Dark Red beets. They are very tasty. To me, they are a blend of earthy soil and sunshine in the form of a beet. Here in zone 8A Texas - it was too hot to grow good tasting beets, so I did not plant any this year.