Possible Clues:

• Greenhouse in another colour over railway
• Certain citrus garden
• Order from top soldier leading yeomanry in Valencia's cultivated area
• Type of conservatory
• Source of fruit provided by old park keeper, Yosemite, primarily
• Greenhouse for fruit bushes
• Building for growing fruit from warmer climes
• Old park-keeper unknown in cultivated area
• House where it's warm or boiling conserving energy
• Is this where the lodge up north meet in green house?