The real estate often dominates the value
A garden center usually sits on a sizable parcel, and that land and its greenhouses can be worth as much as or more than the operating business. Whether the real estate is included, leased, or sold separately dramatically changes what you are buying and what it should cost. Establish up front whether land is part of the deal, get it valued independently, and separate the real-estate value from the business value rather than accepting one blended price.