Two field experiments were carried out at a private Farm in Aga Center, Dakahlia Governorate, Egypt, throughout 2015/2016 & 2016/2017 seasons to study the influence of organic fertilization treatments and foliar application with some microelements and biostimulants as well as their interaction on growth, yield and its components, chemical composition and quality of cauliflower Holland Fargo cultivar. This experiment was conceded in design of strip-plot with four replicates. The obtained results showed that organic fertilizing cauliflower plants with humic acid at the rate of 20 kg/fed performed better than other organic fertilization treatments (compost and farmyard manure) and produced the best results of vegetative growth characters, yield and its component, chemical constituents in the leaves and heads and quality parameters of heads, while spraying cauliflower plants with mixture of microelements solution (Zn at 200 mg/L, B at 100 mg/L and Fe at 500 mg/L) three times 30, 45 and 60 days from transplanting exceeded other foliar spraying treatments and produced the best results of the same parameters mentioned previously. It can be accomplished that organic fertilizing soil of cauliflower Holland Fargo cultivar with humic acid at the rate of 20 kg/fed in addition foliar spraying three times 30, 45 and 60 days from transplanting with the mixture of microelements solution i.e. zinc (Zn) at the rate of 200 mg/L, boron (B) at the rate of 100 mg/L and iron (Fe) at the rate of 500 mg/L in order to obtain  high growth, yield and its components, chemical composition and quality.