There is an oddity in the height of ‘Cupcake’.
The Matthews website April 14, 2015 quoted the height as 4-5 metres. [400-500cm];
and the New Zealand Plant Patent - (Application filed May 12, 2015) quoted 710-1000mm. [71-100cm]
A query today to Matthews Nursery brought the response “There was maybe a typo on the info you were looking at or it's for a different plant with the shorter height.”