Sowing The Seed: Capsicums are best started indoors, in a controlled environment, 6 to 8 weeks prior to the last frost. Sow them in peat pots, at a depth of 1/4” under topsoil. Peat pots will allow you to transplant the entire pot directly into the garden when the weather is warm and will also prevent root shock.Growing Conditions: Capsicum plants will thrive in the heat of summer, so they should receive full sunlight for the majority of the day, with temperatures of at least 75F or more. A soil that is rich in organic matter is best, with a pH level of at least 6.2 and 7.0. Also make sure that your sowing medium is well drained, or your plants can wilt due to being waterlogged. Water your Capsicum seeds daily to provide them with ample amounts of moisture until germination has occurred.Germination & Growth: Capsicum seeds typically take anywhere between 14 to 28 days to germinate. After your seedlings start to grow, they will mature to an estimated height of roughly 24 to 30 inches tall and spread at least 24 inches wide. On average, Capsicum plants can be spaced 18 to 24 inches apart from one another, in rows spaced 18 inches apart. These plants do very well when grown directly in the garden, or in large pots and containers as well.