The amethyst flower or browallia americana is an annual that is part of the Solanaceae family. It grows to be about 12 to 18 inches high and thrives in light shade. The blooms come out in mid-summer and tend to blossom consistently. The flowers are violet, dark blue or lavender in color. The plant is ideal for beds, pots and hanging baskets.
Plant amethysts in neutral to strongly acidic soil. The plants require a pH ranging from 5.1 to 7.5 to thrive.
Feed the flower with fertilizer or compost once it starts to bud. Don't overfeed because too much fertilizer will cause fewer flowers to bloom, despite having lush foliage.
Give amethyst a half day in full sun, then move to the shade during the afternoon sun to achieve the most colorful blooms.
Focus on keeping the soil well drained. Amethysts aren't too fussy about the type of soil, as long as it drains well.
Dig up a few plants about six to eight weeks before the first frost. Cut them back and put them in pots as indoor plants.
Place the pots in a sunny window. Expect flowers all winter.