- You will get 120 Seeds of Rainbow Bell Pepper Mix Heirloom Vegetable Seeds. - Sunlight: Full Sun. - Life Cycle: Annual. - Watering: Medium. - Rainbow Bell Pepper Seeds. - For the bell pepper enthusiast, this collection has it all. An array purple, yellow, red and green colors will give your garden and your dinner unique personality. - Planting. - Start seeds indoors 8-10 weeks before last spring frost date. The temperature around 82 degrees F for seed germination, so keep them in a warm area for the best and fastest results. Start pepper seeds three to a pot, 1/.4" deep, and thin out the weakest seedling. Let the remaining two pepper plants spend their entire lives together as one plant. The leaves of two plants help protect peppers against sunscald, and the yield is often twice as good as two segregated plants. - Begin to harden off plants about 10 days before transplanting. - After the danger of frost has passed, transplant seedlings outdoors, 18 to 24 inches apart (but keep paired plants close to touching.). - Soil should be at least 65 degrees F, peppers will not survive transplanting at temps any colder. Northern gardeners can warm up the soil by covering it with black plastic.