Flower colour varies as per variety- Red, yellow, orange, pink, white, Blue (as per variety). These plants have fast growth rate. The plant can grow in diffused sunlight also. But in less sunlight, flowering will also be less.
Watering & Sunlight: We should water, only when the soil becomes dry. Proper drainage by making sufficient holes in bottom of pot is must. Sunlight availability for maximum time is must for more blooming. For flowering, the plant needs direct sunlight minimum for 3 hours daily.
Soil: Its potting mix must be aerated well by use of drainage media upto 20 % (river sand, Leca, Pumice/Perlite or rice husk- Use any one of them). All these items help in aeration of roots also. We can mix upto 30% cocopeat, 20 % vermi compost, 20 % sterilised garden soil + 10% Neem Cake) in its potting mix. We may add liguid fertlizers every month.