Growing Serrano Pepper Plants Indoors

Fill a rectangular seed tray with a seed starting soil mix until it is 1/2 inch from the top of the tray rim.

Insert the Serrano pepper seeds into the top of the soil mixture, and space them at least 1 inch apart. Cover the seed with another 1/8 to 1/4 inch of the soil mix until the seeds are completely covered.

Water the seed mix until all of it is completely damp and the water starts to drain from the bottom of the tray.

Locate a brightly lit window or room with a skylight or multiple windows. Place the seed tray in a location where it will receive direct sun exposure. If at least six hours of sunlight are not available, place the seed tray 3 inches under fluorescent lights and leave them on for at least six to eight hours per day.

Plug in a heating mat and place the seed tray on top of the mat. Set the thermostat on the mat to maintain a constant temperature of between 80 and 85 degrees Fahrenheit, which is required for the Serrano seed germination.

Water the soil daily, or as needed, to prevent it from drying out until the Serrano seeds germinate.

Transplant each Serrano seedling when they reach approximately 3 to 4 inches tall. Fill individual 10- to 12-inch pots with a sterile all-purpose potting soil until each one is three-fourths full. Insert one Serrano seedling into each pot and add additional potting soil until you completely cover the roots.

Place the pots in an area of the home that remains between 60 and 75 Fahrenheit, which is required to produce the peppers.

Fertilize the peppers using a low-nitrogen organic fertilizer, such as fish emulsion, every two to three weeks using the dosage recommended on the fertilizer package.