A gentle wash with tepid water on all foliage keeps plants clean. Do not expose to direct sun or drafts when foliage is wet. Never allow plants to stand in water after the soil has taken up all the water it can hold. Remember, plants get air through their foliage and roots, so avoid watering too much. To increase humidity, place plants on trays of moist pebbles.
Excess fertilizer burns roots and causes hard, brittle foliage.
Food deficiency causes smaller, fewer flowers and poorly colored foliage. Violets like daytime temperatures 70 to 78 degrees F with a drop of 5 to 10 degrees at night. Better a bit too cool than too hot.