For private grants, you may want to check the Foundation Center's Foundation Grants for Individuals Online. It's a subscription based website ($9.95 per month) but their opening blurb only says that the database is ideal for "students, ...
Vertical farms are designed in a way to avoid the pressing issues about growing food crops in drought-and-disease-prone fields miles away from the population centers in which they will be consumed.
Business Grant Application Process | Personal Government Grants