January and February are the perfect months to start sowing your chilli pepper seeds indoors. Although you can still sow the seeds right up until the end of March, early sowing gives your chillies plenty of time to ripen before the end of summer. The hottest varieties need the longest growing period. Step 1: Prep the Seeds. Spread open a paper towel, place all chilli seeds evenly on it. ... Step 2: Soil and Germination. Chilli plants usually require an airy soil which is well drained. ... Step 3: Flowering. ... Regularly water and nourish the plant and the chillies will grow bigger and bigger. .