.  
Can anyone recommend best fertilizer for growing Calamansi  (Calamondin/Kalamansi)  Fruit?  (see photo)
 
Brand?  Composition?  Source?
  
Thanks in advance for any comments.

  

Cumquats usually have a potassium fertiliser applied. For reference read this 

 http://homeguides.sfgate.com/grow-calamansi-21727.html 

You could try any of the 0-0-60 ferts available at any feed store if you intend to grow a few trees. Either a full 50kg bag or usually you can buy it by the Kg.

Edited October 17, 20178 yr by IsaanAussie