It cost Hayloft £80,000 and is supplied free of charge to the group.
"This is the first third-party website built to the exacting Telegraph design and incorporates the latest, most modern web-based technology, functionality and payment security," said Jarman.
Crocus used to run the Telegraph website up until late autumn 2015. Crocus, J Parker and Thompson & Morgan used to supply plants to Telegraph Media customers. Hayloft Plants was trialled by the Telegraph in summer 2015 and awarded all the business in late 2015.