What they need
Temperature: Peppers need a long, mild growing season to thrive.
In hot climates, plants won't set fruit when daytime temperatures stay above 100°, and bell types may be stunted.
In cool climates, peppers may not ripen fully.
Water: Keep the soil consistently moist. Fluctuations can cause blossom-end rot ― dark, leathery spots on the end of the fruit (sunscald looks similar, but spots are tan and papery).
Fertilizer: Apply a high-nitrogen fertilizer at planting time and again when fruit begins to set. Harvest Gather fruits when they change to their mature color.