What does a (half strength potato dextrose agar (HPDA) mean?

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Alberto Tosca

It means you put half the original concentration of all the elements of the mix.

Sreerama Kumar Prakya

Please see Alberto's answer — however, be sure to keep the agar percentage in the range of 1.5% to 2.0% for proper solidification of the medium.

Prinka Goyal

First prepare 1 L media using given concentration, take 500 ml of it and make total volume 1 L adding autoclaved water