> Along the lines of what Fritz was asking about.... 
> 
> I tried several times to sterilize D. cistiflora, however, it seems
> that it is EXTREMELY sensitive to Sodium hypochlorite.  I sterilized
> leaves for 5 min.  in a 5% solution as well as a 2 1/2% solution. 
> Everytime the leaves just turn brown.  Is there a better way? 
> 
> Can you also tell me what Na2EDTA does for the plant?  Is it necessary
> for a Knudson C based medium? 
> 
> Christoph
 
Hallo Christoph,
If you have a flowering plant try the method I wrote Fritz.
Another possibility is a solution of HgCl2 (poisonous !) - I cannot 
remember the right concentration at the moment.
Na-EDTA keeps the iron-ions in solution (forming a chelat-complex) - 
available for the Plant. Otherwise they would precipitate with the PO3 2-/ 
HPO3 -.
 
Greetings
Heiko