Plant from sibling as early as possible in large flower pot. When the temperature is nice set the plant outside. Bring it in before evening. A week after blossoms appear, sprinkle with a little fertilizer (do not sprinkle close to the stem) and give a lot of water. Check plants in early morning for insects and bad leaves, pinch them off. Always cut in the morning, plants can easily get diseases, early morning dew heals the cut.
The picture was taken 3 weeks ago. I have these two growing on my balcony, it's just enough for the family.