The best homemade orchid flasking medium

[Mr. Tech]

Hello!

What kind of medium do you use for your mother flasks?

I'd like to flask some Vandas or Ascos and ready made medium (Sigma or others) are not available in my country.

So I have to make it on my own.

Last time I used the following:

2 litres of RO water
40 grams sugar
1 whole potato blended
Coco juice of 2 coconuts
Foliar fertilizer in the recommended dose (2 ml Wuxal Super)
18 grams agar
A bit of vinegar

It was an epic fail. I had no contamination at all but I got no plants.

I blame the seeds or the medium for it.

This time I want to try the flasking one more time with other seeds. Should I sow them in the flasks that remained clear or my recipe is the reason of my failure then I should prepare completely new flasks with different media? If I should make new media what would be the best compilation of them?