Lanarkshire-based BHC is builder on the 2ha site.\
The development will create 35 new jobs.
Owner is Berwick Garden Centre MD Nick Crabbie, who said:
"It is expected the majority of these jobs will be filled by local applicants.
"There has been keen competition for the works contract and I'm delighted that it has been won by an ambitious company."
Dutch firm Smiemans will supply the glasshouse.
Crabbie overcame local council opposition to win permission for the centre.