My organization, SeedMoney, organizes an annual 30-day crowdfunding challenge from Nov 15 to Dec 15 which allows church and faith-based garden projects to raise funds from within their communities and compete for one of 250 grants we offer. You can learn more here: https://seedmoney.org/apply/
Another crowdfunding resource is (In Our Back Yards) ioby. I personally have used this organization for my organization's fundraising since 2012 and have raised funds for several of our projects of my gardens and community. And, ioby can also act as your fiscal sponsor if you do not have your 501c3 yet. They actually provide a live person to communicate with you for guidance if necessary. You can learn more here: https://www.ioby.org/
We received a grant from the Sisters of Charity for our garden.