A plan to open a greenhouse business in Milo could help grow the local economy, too. A developer in Boston bought the vacant Ox Yoke building about three year ago. Now he wants to build greenhouses behind the facility to grow organic vegetables, flowers and shrubs, which would be sold throughout New England.Brian Grosse says the project would created about six jobs to start and he expects the workforce to double each year. The initial cost of the project is $600,000 dollars but Grosse is hoping for a community development block grant to cover about one-third of that cost.Milo residents have to approve the grant money this fall. If it goes through, construction is slated to begin next spring.