1/17/2016 Fruit Tree Orchards Huelva, Spain 37.714546°, -6.532834° Fruit trees swirl on the hills of Huelva, Spain. The climate here is ideal for this growth with an average temperature of 17.8° C (64° F) and a relative humidity between 60% and 80%.
Norfolk Island pine (Araucaria heterophylla) will adapt to bright indirect light, but does best with a couple of hours of direct sunlight daily. Needs high relative humidity (pebble tray, humidifier, misting). Water when top inch or so of soil feels dry. Use enough water to allow a little excess to escape through the bottom drainage holes; discard drained water after about 15 minutes. During active growth March - Sept, feed standard liquid houseplant fertilizer every 2 wks
The dewpoint temperature is the temperature you would have to cool the air for condensation or dew to form. It is one of my favorite ways of measuring humidity because it is an absolute number. Relative humidity is a terrible measure, IMO, because it is relative to the air temperature as well as the water content. For example, the other morning we experienced 100% humidity with low-lying fog. The air temperature was 70 degrees and the dewpoint temperature was 70 degrees. (PRISM)