What is sea of green then?
Robert's right, it's not technically a sea of green it's a perpeual harvest system. It's definately the most efficient way to grow buds but there are some concepts that apply to a SOG system each will improve your yeild and over all efficiency and giving thhe appearance of a sea of green.
1.You want to work with a uniform crop so clones must be taken from mother plants every cycle, 2 weeks is standard. Usually short flowering, non branchy plants are used to get long colas and many plants packed in as much as is necessary.
2.A veg room is required big enough to handle the mother plants to make the clones that you will flower and hold the clones in various stages of development.
3.Every cycle you take clones, you transplant rooted clones to a preflowering or flowering area, and harvest a fraction of your crop.
Again, these are just guidenies do what works for you. You don't have to use short flowering strains or only one strain but your yeilds will be affected. You don't have to take clones or keep mother plants, technically you could stagger seed planting an d have a perpetual system. You don't have to grow 100s of plants, you could scrog one plant that would yield the same as a table of plants.