Just putting a seed in the ground(or a pot) doesn't necessarily mean it will sprout. Most seeds have requirements that they need to sprout. Either a dormancy that needs to be broken(stratification) or a hard seed coat that needs to open(scarification), or both. In many cases, if the seed is placed in a baggy with damp(not wet) sand and placed in the refrigerator for 3 months, that will break the dormancy and the seed will(should) germinate. To scarify(disarm the seed coating, ie. hull, shell)you can do it either mechanically(with a file or crack open the shell) or chemically(either using the acids that are in the soil naturally or a dunk into sulphuric acid) to achieve this.
Depending on the particular seed you are dealing with, one or both of these requirements is necessary for good germination. The fall is the best time to begin stratification so, by spring the seed is ready to go in the pot and should begin to sprout as the weather warms. Pat