Good catch just looked it up has enough fert to last 2-4 weeks so they say, although there are so many variables to how much and how fast nutes are consumed. The soil manufacturer website lists instruction to this soil and also provide a list of acceptable nutes thereafter that 3 week period.
How to use Gold Label Special Mix:
Gold Label Special Mix is very easy to use. Simply fill a pot with it, plant your cutting or seedling into it and water well. Wait until the soil-mix gets a little dry before watering again. Gold Label Special Mix has enough food in it for at least 2-3 weeks fast growth so do not add food during this period. When feeding becomes necessary, we recommend Plant Magic Old Timer Nutrients which will provide everything your plant's need, although soil-feeds by BioBizz, House & Garden, Plagron or Canna work very well, too.
I copy and pasted this paragraph.