Neame Lea managing director David Ball said the VP site gave extra, much-needed capacity.
It is an 8.4 acre site with 3.5 acres of heated glass and 1.5 acres of outdoor beds.
He said Neame Lea would rather own sites than rent them and with a "big demand for UK production" related to exchange rates took the opportunity to expand.
Neame Lea will grow mainly a monocrop of pot bedding on the site which will go to its main site at Horseshoe Lane two miles away. Horseshoe Lane underwent a £10m expansion in 2015.
The former bedding nursery used to supply a full range of bedding to garden centres and market traders.
Neame Lea expects to reach almost £40m turnover in the 2017 calendar year. Ball said growing production efficiencies and expanding into cut flowers and herbs helped protect the business from risk. The company partnered with Zyon UK last year.