Serrano peppers are very hot, blunt-tipped peppers that grow to be about an inch in length. These peppers are good producers, growing best in full sun and temperatures above 75 degrees. Young pepper plants can be purchased at garden centers or seeds can be started in peat pots 8 to 10 weeks before the last frost. Keys to successfully growing serrano peppers include preparing the soil properly, minimizing the shock to the transplant and watering the plant thoroughly.
Till the soil with a rake or rototiller, working 8 inches deep until the soil is loose. Allow the rototiller's tines to dig into the soil until the depth is met. If using a rake, stab and break up the soil with the rake until the depth is met.
Till soil in a straight line working in rows. Once a row is finished, turn and continue back to the opposite end.
Sort through soil by hand to remove weeds and rocks from the soil.
Empty bags of manure or compost into the wheelbarrow.
Shovel a 3-inch layer of compost or manure by removing it from the wheelbarrow with the shovel and dumping it on top of the soil.
Till the soil again, incorporating the compost or manure. Work in rows until the garden area is tilled completely.
Rake the soil until it appears level.
Water the soil with a hose until saturated.
Dig a hole, using a shovel or trowel, deep and wide enough for the roots and the base of the plant.
Remove the pepper plant from its container and place in the hole. Pack soil lightly around the base of the plant.
Water the soil surrounding the plant until it is saturated. Water the pepper plant whenever the soil is warm and dry.
Harvest peppers before they are fully ripe, when they are still green in color.