Bell peppers are a perennial in tropical areas. But in colder climates, they are grown as annuals and they really have no tolerance for cold weather.
They require a fairly long growing season, often up to 90 or even 100 days, so the shorter your summer, the sooner you need to start seeds indoors.
It is possible to save seeds from organic store bought bell peppers. Collect seeds from red peppers, since they are more mature then green ones, and set them out to dry for a few days. Then sow them or store them in a paper envelope and place them in a dry location for safekeeping.
Starting seeds 6 to 8 weeks before the last average frost date in spring. However, if you keep plants healthy and thriving, you can sow them even earlier.
Start seeds using a seed starting mix and place them in a warm, sunny spot. Covering flats or cell packs with plastic can help speed germination rates.
Providing a consistent source of heat, like with a seedling heat mat, will also help since soil needs to be around 80°F for seeds to germinate. If soil is warm enough, germination should occur within ten days.
Once seeds germinate and grow two to three true leaves, you’ll want to pot them in larger containers filled with damp potting soil to reduce settling. Add organic fertilizer according to label recommendations as well, to encourage strong growth.
Water newly potted plants well and keep them consistently moist.
Shallow roots and heavy fruits make bell peppers more likely to topple over, so consider staking them once flowers begin to form.
While fertilizing is helpful, be cautious not to over fertilize, especially with nitrogen. This is known to cause leafy green growth, but it will actually stunt flower and fruit production.
(Source: by Amber Shidler)