Watch for the seeds to sprout. It will take anywhere from a few days to a few weeks for the seeds to first sprout. The seeds will sprout a pair of leaves to start, known as ‘seed leaves’. After a bit, a second pair of leaves will sprout; these are known as the ‘true leaves’ and signals that the chillies are ready for transplanting. You can continue waiting for them to grow and for the heat outdoors to rise, or you can plant them as is when their true leaves come in.