Go ahead n scream but yelling usually ends up in apologies! Although I agree many seeds are quite capable of germinating without our assistance, greater success can be achieved if we can create ideal conditions in which seeds burst into life. Just as the fork and spade are essential tools of the gardener, a propagator is part and parcel of the seed-raiser's armoury.
In order to germinate from a seed, plants have three basic requirements: moisture, oxygen from the air and adequate temperatures. Not all require light to germinate. These may sound simple enough to provide but at no other time in its life is a plant more vulnerable to changes in the environment than during the process of germination. Young tissues are very fragile and have not yet had any time to build up resistance to sudden changes in temperatures and moistures. Excess of both these basic needs can be as damaging to young plants as if they were not provided at all. If conditions are not right for germination, some seeds will remain dormant until conditions improve, others will perish.
Although plant breeders are currently introducing new varieties and hybrids that are easier to germinate and more uniform in their rate of germination, there is still a vast range of plants offered by seed merchants' catalogues which have a whole spectrum of responses to moisture and temperature. This is obviously determined by the climate they experience in their homelands. Some plants may need only a short period of high temperatures to stimulate germination whilst others may require consistently high temperatures over a long period of time. Others may even need a mixture of high and low temperatures each day in order to grow.
Whatever we grow from seed be it vegetables, bedding plants or something from the depths of a tropical rain forest, seed is valuable. It makes sense to be able to control the conditions affecting germination, tailoring them to the needs of each specific plant rather than leaving it to chance. Propagators enable us to achieve this degree of control. Besides making our hobby more rewarding, sweeping away much of the mystique which surrounds growing plants from seed, they also extend the growing season by providing optimum conditions if growing outdoors.