Even water contains varying amounts of dissolved salts, as does the fertilizer you apply. These dissolved salts accumulate in the soil and appear on the soil surface. Flushing the soil from time to time prevents salt injury to your plants. Soak clay pots with accumulated salts in hot water for 24 hours before reusing them. Also, plants kept at really warm temperatures require watering more frequently.
Cold temperatures can cause chilling or even freeze damage to houseplants.
Most plants can take temperatures as low as 45 F before being damaged, but some plants, like the peace lily, syngonium, aglaonema and certain palms, can suffer damage around 55 degrees. Be mindful as well of water temperature. An ideal water temperature for your plants is lukewarm or tepid. Certain plants, such as African Violet and gloxinia, can have their foliage damaged by water that's not tepid. Extremely cold water can cause root damage and slow the growth of your plants.