Select transplants for a mild variety of jalapenos to ensure they are not as spicy as other types. Common mild varieties include Texas A&M (TAM) Mild Jalapeno and Numex Primavera.
Plant the jalapeno transplants outdoors one to two weeks after the last frost. Select a sunny, well-drained area in your yard, or fill a plant container with potting mix that has a pH level between 5.5 to 6.5. Apply a vegetable fertilizer according to the directions on the label.
Water your plants one to two times a week to keep the soil moist, but not waterlogged. Keeping your jalapenos watered well ensures the plants are not stressed. The heat level increases when fruit develops while the plant is stressed.
Mulch the soil around the plant with an organic material such as straw or pine needles. Mulching helps retain moisture and prevents weeds.
Harvest your jalapenos while they are in the green stage. Jalapenos that turn red at full maturity are known to have hotter flavors.