Phitosterols suspension concentrates and process of preparation thereof

A method of stimulating plant growth comprising:

• a) preparing a concentrated suspension containing phytosterols, comprising grinding one or more phytosterols until an average particle size of less than 10 pm is reached, said concentrated suspension comprising:
• i) a phytosterol mixture of beta-sitosterol, stigmasterol, cam pesterol and brassicasterol, in an amount higher than 25% by weight with respect to the total weight of the concentrated suspension, wherein beta-sitosterol is present in an amount ranging from 40% to 45% by weight with respect to the total weight of the mixture of phytosterols, the campesterol is present in an amount ranging from 20% to 25% by weight with respect to the total weight of the mixture of phytosterols, the stigmasterol is present in an amount ranging from 20% to 30% by weight with respect to the total weight of the mixture of phytosterols and the brassicasterol is present in an amount ranging from 1% to 5% by weight with respect to the total weight of the mixture of phytosterols;
• ii) one or more wetting agents in an amount ranging from 1% to 5% by weight with respect to the total weight of the concentrated suspension;
• and
• iii) one or more dispersing agents in an amount ranging from 1% to 5% by weight with respect to the total weight of the concentrated suspension;
• b) applying the concentrated suspension by one or more of application to any part of a plant, application to the soil by means of fertigation, incorporation into the ground, through seed tanning, and by combinations thereof.