The violet plant I have the leaves are turning purple (2 of them) one is purple and one is purple and welted.
What would be the cause?
The flowers that have bloomed do I take off the flower or wait til it drops. Feel the plant is healthy given new potential blooms, thank you
African Violet leaves changing colour can be a sign of over fertilization. Use a water soluble balanced fertilizer (e.g., 20-20-20) or (to encourage more rapid flowering) a 15-30-15 fertilizer. Dilute the fertilizer to one-quarter the recommended strength and apply it once a week or each time the plant is watered. The soil should be moist before fertilizer is applied.
Conversely, the purple colour can be the result of inadequate soil nutrients, specifically phosphorus, and of inappropriate pH balance.
The African Violet Society of America has a handy guide to leaf colour issues, Nutrient Deficiency in African Violets.
In the case of nutrient deficiencies, repotting the plant would be the best solution Packaged African violet balanced soil mixes are available. Again, the Society has a guide to repotting.
Further, as with many plants, the oldest, lowest leaves naturally die off and should be removed. And yes, you should pick off the old, fading, flowers to encourage new ones to form.
By the way, you can make new plants by cutting off one of the lower healthy leaves and rooting it in water or soil.
Finally, we have a great Gardening Guide all about growing this lovely plant and you will find details about how to propagate new plants there.