Answer: This lack of humidity can affect plants with the symptoms you described. Setting the plants on a pebble tray filled with water or running a humidifier can help. Another possible cause can be a gradual buildup of salts in the potting soil. You might try leaching the soil by watering heavily to the point that water is running through the bottom of the pot. Repeat several times in a row to flush any salts out. If there is any buildup or residue of minerals on the soil surface, remove that, too. Tap water does not usually cause a problem unless it has been treated with softener chemicals -- these may adversely affect plants. If you have a water softener, use rain water or use water drawn out of the system prior to it running through the softener. Most houses equipped with a softener will have a tap or possibly an outdoor faucet for just this purpose. One last possibility is that you may be overwatering. Hope this information helps you determine just what the cause might be.
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