This section is from the book "The Fruit Manual: Containing The Descriptions And Synonyms Of The Fruits And Fruit Trees Of Great Britain", by Robert Hogg. Also available from Amazon: The Fruit Manual.
The only variety cultivated in this country for its fruit is the Black Mulberry (Morus Nigra), and it is only in the southern counties where it attains perfection. In the midlands it ripens its fruit when trained against a wall; but it is doubtful whether the crop so obtained is sufficient remuneration for the space the tree occupies. Since the introduction of orchard-houses, the mulberry has been cultivated very successfully in pots, where the roots are kept under subjection, and the tree is confined to the form of a small bush or close pyramid. In such condition it bears fruit abundantly, and forms an object of interest as well as of utility.