- Peppers are annuals, grown by seed in full-sun locations where the soil drains well. Pepper seeds will not germinate if the soil temperature is less than 55 degrees Fahrenheit. When temperatures remain at or above 85 degrees, pepper seeds germinate in as little as seven days.
- When growing pepper seeds indoors, keep them in a sunny room where the daytime temperature is 70 degrees Fahrenheit and nighttime lows are around 65. Pepper plants suffer greatly if transplanted outside when temperatures are cold. Wait two to three weeks after the last expected frost in spring before transferring pepper plants to the outdoors.
- The flowers sometimes drop off a pepper plant or the pollen becomes sterile when daytime highs exceed 90 degrees Fahrenheit, according to the Ontario Ministry of Agriculture, Food & Rural Affairs. If the flowers develop when temperatures dip to between 45 and 50 degrees, the fruit sometimes develops smaller than what is typical.