I prefer the Serena series (seed produced type) because local greenhouse growers produce and sell them more cheaply. Vegetative (cutting) type angelonias grow taller, are heavy bloomers, and are more pricey at garden centers.
Varieties of 'Serena' angelonia come in white, pink lavender, lavender, and purple flowers. Plant them after the danger of spring frosts in your gardening area is low. After planting, follow-up with a few early waterings. Then, sit back and enjoy angelonas in constant bloom from late spring to the first hard frost of autumn.
Serena angelonias grow 12-15 inches in height and 14-16 inches in spread in my zone 6-b garden.
photo: pentas (front) and 'Lavender Pink Serena' angelonia (rear)