As we all know, fermentation is one of the critical stages of wine making. Without fermentation, it is impossible to create wine as the base process involves live organisms called yeast turning sugars into alcohol.  There may be times you may find that you have problems with the fermentation process. Usually, these problems will take the form of either fermentation that just does not occur at all (stuck) or else is too slow.

One of the reasons that this may occur is that the temperature was either too cold or too hot. Remember that yeast cells are live and in order to become activated they require a temperature typically between 70 and 85 degrees Fahrenheit. Temperature can variate as different strains of yeast prefer different temperature ranges. Ideally, you should aim for around 72 degrees; however, if you drop below 70 or go above 80 degrees, you may have problems. When the temperature is too cool, the fermentation will likely not occur at all. When the temperature is too warm; however, the yeast can become damaged and will also perform poorly.

This is why it is critical to ensure that you have a stable temperature in the room where you ferment your wine. If the temperature in the room fluctuates, you can also have problems. Basements tend to make the best places for fermentation; provided the area does not become too cool during the winter. In that case, you can provide a small heat source. Making sure that your fermentation containers are not placed directly on the floor may also help. You can also use a thermometer to monitor the fermentation. A floating thermometer can be placed right in the wine and you can lift it out when you want to check the temperature.

Improperly starting the yeast can also result in problems with fermentation. This is also commonly due to problems with temperatures. Most yeast packets require the yeast to be rehydrated, or moistened, with warm water prior to use. Ideally, this should not cause any problems. That is, unless the water temperature was too warm. Most yeast packets call for the temperature to be somewhere between 95 and 105 degrees. If the water exceeds these temperature limits even just a small bit, the yeast is likely to be destroyed and unable to do their job.

As a result, it is important to make sure that you actually verify the temperature of the water before you add the yeast. In addition, it is important to make sure that you do not leave the yeast in the water for too long. Generally, you will need to leave the yeast in the water for about fifteen minutes. If you walk off and forget about the yeast and leave it in the water for even a few minutes longer, you will also run the risk of destroying the yeast cells. Therefore, it is important to keep an eye on the clock and make sure that the yeast does not remain in the water for any longer than 15 minutes at the most.

Adding too much sugar can also cause problems in the fermentation process. Remember that while it is necessary for yeast to have sugar in order to produce alcohol, you can add in too much sugar. When the sugar level is too high, it may begin to have a detrimental effect on the ability of the yeast to produce alcohol. This is why it is critical to verify the amount of sugar that is already present in a batch from the fruit itself before you add in any additional fruit.

Remember that the fruit itself will have its own amount of sugar. This level can vary from one fruit to another, making it even more important to verify the sugar content level. A hydrometer can be used for this purpose. If you have not previously used a hydrometer it is a good idea to invest in one and become acquainted with it. A quality hydrometer can help you to avoid many of the problems that might otherwise ruin a good batch of wine.