The process of germinating plant seeds begins by obtaining a very sterile soil made of peat moss and perlite and watering the freshly planted seed often. Encourage a seed to sprout a stem with gardening help from an urban horticulturist in this free video on plant seeds. Expert: Stan DeFreitas Bio: Stan DeFreitas, also known as Mr. Green Thumb, has experience as an urban horticulturist working for the Pinellas County Extension Service and has taught horticulture at the St. Petersburg College. Filmmaker: Christopher Rokosz