Posted: 05/06/2016 at 20:21
I think you've been misled about it being a magnolia. I had exactly the same problem with a Stellata bought at Lidl. It grew and grew for about 5 years, not a flower in sight, just leaf and catkins all over the place. In the end, I got so fed up with not seeing any flowers that I yanked it out and planted a M Susan instead. This year, after only 2 years Susan has produced a fab crop of flowers - a true magnolia. I'd be tempted to dig it out and start again.