Question
QUESTION: In a commrcial indoor planting, we have an floor where the plants, all in separate pots, smell awful.  Not from overwatering, as we have let them dry out and then watered them, and once again the smell pervades the area.  What to do?

ANSWER: Hi Elsie, Odor from soil/mulch is usually associated with water standing in the bottom of a container after watering. You may need to repot to remove the soggy soil, but consider a layer of gravel in the bottom of every pot that is deeper than the saucer.  This holds the soil out of the water after you have watered.  Try also to remove any standing water shortly after watering.  Jim

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QUESTION: Jim,
I agree with your answer on most situations.  Standing water stinks, but this is not the situation, as it comes from watering dried out plants in dried containers. We have styrofoam peanuts at the bottom of all pots and all plants are saucered.  Is there a way to rid the smell, such as watering with vinegar?  
Elsie

Answer
When you add water to dry plants, the smell returns.  That indicates the soil is the problem and that's why I suggested changing it.  Hydrated lime or vinegar may mask the odor, but your plants are likely to suffer from the pH change.  Try this:  Next time you need to water, mix a quarter teaspoon of Febreeze in a gallon of water.  The enzyme in Febreeze does a good job of neutralizing odors.  I have sprayed it on the soil surface to mask a mildew smell and not had any ill effects on the plant.  Try it on one and see if it helps.  Jim