Hippophae rhamnoides - common sea-buckthorn
Hippophae rhamnoides, common sea-buckthorn, is a species of flowering plant, native to fixed dunes and sea cliffs in Europe and Asia. It is a spiny deciduous shrub. Hippophae rhamnoides fruits have been used in the traditional Austrian medicine internally as tea, juice, or syrup for treatment of infections, cold, and flu. The fruits of sea buckthorn are used in a wide variety of products, they're absolutely healthy and contain lots of Vitamine C. Due to difficult harvest conditions and long ramp-up time of 6 to 8 years buckthorn is a relatively expensive raw material.
Growing from seeds:
These seeds need a stratification first, meaning that they have to be treated with cold for several weeks. This can easily be done by planting them directly into your garden at autumn and then they'll start to germinate in spring.
Second option is just simulating the winter season by putting seeds, together with some soil, into the fridge for about 4-6 weeks.
Plant is absolutely hardy!