Hippophae rhamnoides - sea-buckthorn aka sea berry

An 8 - 10 ft zone 3a deciduous shrub that produces edible berries rich in vitamins A, C and E (among other things). This plant freely suckers so be sure to contain it, and it also has long lance like thorns so care must be taken when working around it

 

Native over here on coasts - here's a natural population at Aberlady Bay, southeast Scotland, in November a couple of years ago. Grows taller than you give, easily to 6 m, rarely 8 m tall. The berries are spectacular.

 

And 13 m (43 ft.) tall at Hillier Gardens in 2008, 14 m (46 ft.) high at Kew 2 years later.