That formula is not made specifically for orchids, just labeled that way and endorsed by the AOS upon receipt of financial compensation.

ALL fertilizers are made for "every watering right off the bat". It's the concentration and frequency of application that need to be controlled together. My experience has taught me that my plants do well when I apply 75-125 ppm N weekly, summing the number of applications. By that I mean that I divide that average (100) by the number of times I'll be feeding them, and the result is the concentration of fertilizer to be applied each time, knowing that rounding up or down for convenience will still keep me in that range.

If you divide 8 by the %N on the fertilizer label, the result is the teaspoons/gallon for 100 ppm N - right in the middle of that range. If you prefer metric calculations, 10.4/%N gives you ml/L. *[corrected from my original, erroneous 9.2]*

That is a 20-20-20 blend, of which 9.6% of the nitrogen is nitrate and ammonium salts, while 10.4% is urea. From a practical standpoint, the plant won't use much of the urea, so I would consider it a 10-20-20 for dosing purposes. 8/10=0.8, so if I was using that, I'd use about 3/4 tsp/gallon once a week, 3/8 for twice a week application, etc. Their recommendation of 1 teaspoon every 10-14 days is right in line with that.