Your hugel looks very similar to mine in size, except mine is on contour and doubling as a
swale. We're not in a really cold climate. Mine has just gone through a growing season. It's autumn, (fall), here in New Zealand. It did better than I expected for a first season. I watered it just twice toward the end of a long dry spell and it grew, and is still growing, lots of salad veges, silver beet, amaranth, linseed, buckwheat, globe artichoke, lambs quarters, strawberries, tomatoes, courgette, pumpkin and rhubarb. There are parts that are collapsing in now, I presume that is because the
compost we initially packed between the logs and branches is breaking down. I've been cutting tree lucerne, ( tagasaste), and stuffing it in the holesto try to fill the gaps. I've also been sprinkling vegetable seeds around as they ripen eg parsnip, linseed, carrot, lambs quarters, amaranth and quinoa. From now on we'll plant more
perennial things such as chilean guava more strawberries and rhubarb, cape gooseberry, jerusalem artichoke etc. Then we'll renew the mulch layer depending how much of a vege seedling cover there is. All the best with yours.