Planting your hazelnuts too close to the river could result in some beaver damage as shown below.
I (Dan) tried hand pollinating some of the flowers this year. First all of the catkins were removed from the branch, then a bag was placed over the flowers to keep it from getting pollinated by outside pollen. Pollen was then collected from selected plants and used to hand pollinate the female flowers. The bag was then placed over the pollinated flowers to keep unwanted pollen out. The bags were removed after the catkins dropped.
This picture is showing the developing hazelnuts that were hand pollinated.
This is an emerging seedling that was planted this spring after stratification.
This is what they look like a week or two after emerging.