What kind of outlets would you recommend? Regular or GFI?
GFI for sure. I had an electrical fire in mine due to a water accident. Accidents beyond your control can happen! Protect yourself.
GFI. Weather resistant. covered when not in use. Put in 2x as many as you think you might need.
I don't know how big your greenhouse is but I had them run a big line 50 Amp so I could use 240 volt heaters.
I planned for the worst. As if the water froze broke pipes and sprinkled the electrical boxes. They’re all waterproof and I have a switch 30 feet from the greenhouse that I can throw should it become necessary
From what I know, there is only one gfi outlet per circuit, which is the last outlet in the circuit. I think about thirteen outlets or fixtures combined allowed per circuit. The electrician will know.