I'll bite, The hot item that a lot of people are using is the MSU formula, which Ray sells, although respectfully he doesn't promote it at every turn which is nice.
Here's a story.
A salesman goes up to a lady and sells her some magic fertilizer; the directions say to apply it every day. She does, her plants grow spectacularly. One day she peels off the label and notices that she's been just watering her plants with... just water. Yup, nothing but water. Furious she sues the salesman. "But your plants have done fabulous!" Says the judge as he throws out the case. The moral of this story, is that it's not necessarily WHAT you put into your plants, as much that you DO put anything into them. Paying attention often is worth more than any fertilizer. It's not a magic bullet, but merely a foundation.
I've been using Ray's MSU fertilizer for 6 months, and it works. Others have used it much longer. I do have a LOT of roots, my Vandas phenomenally so... I can't say I've been without flowers on any plant yet, but in a year's time I'll know, but I seriously doubt I'm short on phosphorous as I've flowered a few vandas now, and most of my others are growing well, if not flowering yet.
Basically it's a 13/3/15 NPK ratio + trace elements, and you can buy 2 formulas which are balanced for your water; RO or well water. I don't think he makes a city water, since it varies so great from city to city... but if you have relatively soft water to start with, you should be all right with the well water formula which I believe has NO buffering capabilities, so it relies on your city's water in order to maintain pH. Maybe Ray can comment on that, as I'm thinking of switching from RO formula to well water, as I have such soft water here in NYC, 30-40ppm EC, which I would think would be similar to well water?
Best way is RO + RO formula... RO = Reverse Osmosis water... basically no minerals at all... the important part is getting regular nutrients to the plant.
There are urban legends in the plant world that phosphorous and red light stimulate flowering, fruiting etc... which are more or less false. In the same sense, they attribute nitrogen and blue light to vegetative growth; which is also false. Now neither of these are 100% false, but it makes an easy sale, and people grab that concept and run with it. There are some reasons which people distort to make the above mentioned urban legends sound plausible, but if you see anyone relying on any one truth, it's false.
Ray's formula is great, he contributes as you've seen, and supporting him supports a good cause, as I see it. On the other hand, just about any balanced fertilizer will do, just make sure that it is relatively generic with trace elements, not some whacky 0/5/90 or 3/50/3 formula...
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