The more nutrition in the soil the better and faster the plant grows!
How To Make Plants Grow Faster?
Plants grow if you talk to them and water them
I think they grow when we provide sufficient water minerals,etc
These are weird answers but they really work, pour pickle juice on the plants or put coffee grounds on them. The coffee grounds work the best.
Its a proven fact tht playing classical music to them does.
By watering them
It really depends on what type of plants you are talking about, but I have had very good luck with Miracle Grow. They make it for different types of plants and also for vegetables such as tomatoes.
I really don't noe or care
I've heard that human blood has been used by some people to make plants go faster, there even might be fertilizers around with blood in them but it's probably fish or sum animal blood. I've even tried milk before :D