Lighting & Environmental Conditions

What light level should I keep for growing ferns in a greenhouse?

1200/2000 fc (foot-candles) of light is required during active growth periods, so shade may be required, especially in the Southern U.S. climates.

At what temperature should I keep my greenhouse for growing perennial/tropical ferns?

For the first 6 to 8 weeks, a soil temperature of no lower than 65°F/18°C is best; the ideal would be 68° to 75°.  This will help establish the transplant.