Grow Capsicum annuum 'Purple Beauty' for eye-catching, thick-walled bell peppers that begin a rich purple and mature to red. You will get the best color, flavor, and yields with warm weather and a sunny site.
Start seeds indoors 6-8 weeks before your last frost date. Transplant outdoors only after all frost risk has passed and nights stay warm. Choose fertile, well-drained soil and mix in compost to improve structure. Set plants 12-18 inches apart (about a 15-18 inch spread) so air moves through the canopy as fruits develop.
Water deeply when the top inch of soil begins to dry, aiming for steady moisture rather than boom-and-bust watering. Mulch helps keep roots evenly moist and reduces stress during summer heat. Feed lightly but consistently; too much nitrogen can delay fruiting, so use a balanced fertilizer and follow label directions. In containers, use a quality potting mix and a pot large enough to hold moisture without staying soggy, and expect to water more often in hot weather.
As the plant fills in, consider staking or a small cage to support heavy fruit loads and prevent stems from snapping. Harvest peppers when they are glossy purple for a mild, sweet bell pepper, or allow them to fully color to red for maximum ripeness. Pick regularly to keep plants producing. Peppers are frost-tender and slow down in cool temperatures; in warm regions (about zones 9-11) you may be able to overwinter plants in a protected spot for an earlier start next season.