it is not worthy to get confused on organic or inorganic. the need of plant growth promoters shows that the seed and the plant has a basic weakness embedded in it. the so called hybrid seeds and plants need all these things. the natural seeds and plants do not need this. for eg- grafted plants like mango, grapes etc need this type of treatment due to basic lack of the self growing abilities with them. where as natural mangoes and grapes do not need the same. it is all just commerce and avarice. the trees/plants grown by natural seeds are strong enough to live on themselves and produce their progeny by flowers, pods and seeds. but the human interfered plants and trees are always having this problem.
the soil fertility also plays a vital role. the need of growth promoters shows that the soil fertility is very poor. hence the need.