PRE TREATMENT IS REQUIRED TO ENSURE A HIGHER RATE OF GERMINATION, WITHOUT THIS ONLY 10% WILL GERMINATE.
Physically breakthrough the seed coat by cutting or (k)nicking the edge of the seed with a knife or using a file or even rubbing them between layers of fine sandpaper. All of these methods can be used to break through the seed coat. Once you have done this soak the seeds in cold water for 12-24 hours and successfully treated seeds will have imbibed water and swollen greatly. Any that have not could be scarified again followed by another water soak. Sow all the seeds, even those that remain small as they may germinate later
Once the seeds have become swollen with water germination is very rapid if the seeds are kept at room temperature and a root will emerge with a couple of days.
Sow the seeds individually in pots filled with good quality compost at a depth of about 1 cm (just less than ½ an inch) and the plants will appear very quickly if they are kept in warm temperatures.