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A: The biggest factor leading to lack of souring while using lacto is due to the amount of hops in your recipe. Even as much as 2-3 ibu's will inhibit lactic acid production. Try brewing or kettle souring with no hops.
==Why did my Roeselare beer not sour==
Q: I used Roeselare (or some other commercial mixed culture) and it did not sour yet. What do I do?
A: Sometimes Roeselare and other mixed cultures don't get the acidity that you might want. If it hasn't been a year yet, waiting longer may help, but sometimes it doesn't. If after a year the acidity is not high enough for you, try adding fruit such as cherries or raspberries. The fruit has citric acid in it, and the sugar content will partially be turned into lactic acid by the surviving bacteria (the brewer's yeast will be dead after a year). Brewing with no hops and a very high mash temperature (158°F-160°F) is highly recommended for next time. For more information, see [[Mixed Cultures]] and [[Mixed Fermentation]].