White blackberry

'White blackberry'
White blackberry "Iceberg" in the The Burbank seed book
Breeder	Luther Burbank in 1914

The white blackberry is an unusual white variety of blackberry developed by plant breeder Luther Burbank, also known as the iceberg white blackberry or snowbank berry, probably originating as a pun on the name "Burbank".

He originally found a wild pale coloured blackberry in New Jersey, named 'Crystal White'. He then mixed that berry with other pale berries. Burbank had tried out 65,000 unsuccessful crossbreeds, at his facility in Santa Rosa, California, before enjoying success in 1894.