[sandra]

I'm getting a little mixed up with all the info regarding fertilizers. When?, for which kind of orchids (all?), how much? and does all that make a difference depending on what you're growing the orchids in?

Does the following sound right (for growing in the northern hemisphere)?

April through June - high nitrogen formula (e.g., 30-10-10) weakly, weekly
July through September - bloom booster (e.g., 10-30-20) weakly, weekly
October through March - reduce fertilizing to once/month (bloom booster)

OR, a balanced fertilizer (20-20-20), weekly?

Realizing that growing in bark, a high nitrogen fertilizer would be recommended over a balanced one, correct? Alternating between high nitrogen and high phosphorous for orchids in bark is a recommendation over a balanced fertilizer?

AND what if your growing medium is other than bark such as Dyna-rok or Hydroton which contains nothing organic? Is a weekly maintenance of a balanced fertilizer recommended with a flush every 4th watering (using no seasonal, alternating schedule)?

Also, which orchids is it advised to stop fertilizing during winter? I know Dend. Nobiles but, any others?