i use all organics, spring/distilled water, give bontanicare karma throughout the entire growth to harvest, use beneficial fungi and bacteria, veg for 4 weeks flower for 3, flush twice during veg and once during flowering.
always stay up on your plants down to the finest of details.
i get above 200+ a plant.....but i grow a high yielding strain also.
it depends on what you feed it (organic or chemical), your soil's health (if grown in soil), the plants health, light given (light spectrum for different growth phases), quality of water, strain, plant must not endure any stresses, training techniques such as fim or topping, and length of veg.
it all comes down to how much love you are willing to put into each plant.