The Sweet Bell Pepper Bell Boy, 'Capsicum annuum' produces a thick-walled mostly 4 lobed pepper. It is usually picked when green however the mature stage is red. The Bell Boy has very sturdy plants and is resistant to tobacco mosaic virus. Transplant outside in the spring 3 to 4 weeks after last frost date. Note: To get a jump on the season transplant outside, use a walls-of-water or some black plastic to maintain and increase temperatures. Pinch off early flowers to encourage plant growth. Plant in average garden soil with sufficient organic matter. Peppers use quite a bit of water but prefer to be watered deeply and not too often. Blossom pruning will improve fruit size. Pinch off about 50% of the flowers. ... additional info