In-depth Discussion on Orchid Cultivation: The Effect of pH on Orchid Growth

In-depth Discussion on Orchid Cultivation -- About pH

http://www.dfac.cc/showtopic-17-276470-0-0-3.htm

In that post above, a fellow orchid grower asked about the pH of 2.8 around the crystal tips.

Hehe.....

The pH around orchid crystal tips is indeed around 2.8; this level of acidity can corrode stone

Plants break down soil entirely through humic acid

When people transplant flowers, they all want to get some old soil (commonly known as "mother soil")

That is the reasoning behind it

Orchids that are frequently repotted grow slowly

It is because the humic acid around the crystal tips is destroyed

(That is to say, a micro-circulation is disrupted)

It needs to be re-established

During the period of re-establishment, growth is slow

Hard to say, just talking nonsense. Hehe........