Angraecum magdalenae- what not to do

[Leafmite]

I bought the last batch of red lava rock from Lowes. I usually rinse it just to get the dust from it (use a bucket and toss the water outside) but I do not believe it is salty. If the plants are going directly outside, I do not usually rinse it. If you break or crack any of the roots of your mag, you want the rock to be dry when using. With my first mag, it was so small, there was barely any roots the first time I potted it up. Then I moved it from a clay pot to a basket pot and broke a couple of roots. By keeping the roots dry for a few days, it just kept growing as if nothing had ever happened.

Calcium. No, I do not have any scientific evidence of how exactly it works. It is just something an older gardener told me when I was quite young and it seems to work really well for all of my plants, even the ones with a lower pH. I am sure if you google enough, you can get the answer to that.