Would you be interested some remote collaboration on the Greenhouse Monitoring project? I have a small urban farm near Cleveland, OH: http://baybranchfarm.com with a small hoophouse.
I would be willing to purchase the components and build my own monitoring device. And then also assist with the design and programming. Once operational I could give farmer feedback on the use of the device.
I have limited electronics experience and no arduino experience, but I have wanted build an arduino project and this seems like a great one (and I have wanted to monitor the temperature in my hoophouse). I have a degree in Mechanical Engineer and have been an application developer for 15 years.
Good luck with the project.