His collection stands at over 200 species and , although not within the scope of the National Collection , he also grows many cultivars .
The British National Collection of Rubus is held by Barry Clark at Houghton , Hampshire .
Barry Clark 's collection stands at over 200 species and , although not within the scope of the National Collection , he also grows many cultivars .
The British National Collection of Rubus is held by Barry Clark at Houghton , Hampshire .