Chillihead Selection Chilli Seeds. Buy the world's hottest chilli seeds here. Looking for the world's hottest chilli seeds? Ok you fancy yourself as a Chillihead... you have traded your newspaper, slippers and pipe for a nail bed and burning coals. In this section we have chilli seeds for chillies that are nuclear. These seeds are for chillies that are the hottest of the hot. The world's hottest and then some. These are chillies that range from 1,000,000 SHU to the World's Hottest (±2,000,000 SHU) That is some 400 times hotter than a Jalapeno. This is mother nature at its most brutal!