How important is it to control the temperature of a yeast starter?

[deuc224]

I do purely because I only have a 2L flask. Once the first step is complete, I crash it, decant the supernatant and then begin the second step.

If you had a bigger flask, 5L, would you still do it?

 

[KeizerBrewr]

I would, yes. The supernatant would dilute the fresh starter wort throwing off the calculations for growth.