In general, it’s a good practice to not leave the embryo of a tropical seed laying buried in the soil for too long. The goal is to get the seed as reasonably fresh as possible and to get it germinated as soon as possible. Lurking in seed growing mix are a plethora of good but also pretty bad bacteria, virus, and fungi. Even the so called “sterile potting medium” is not totally immune to housing those bad microbes. I also tend to think that each embryo has a period of what I like to call the will to survive (aka germinate). After that time is up, the embryo just tends to give up at germinating and so the longer the seed stays in the ground, the harder is for the embryo to have the strength and determination to break free from the seed shell and become a viable plant. I’m just telling like it is because I learn it the hard way. Hope that helps!😀