Dyna-Gro Pro-Tekt is a nutritional supplement for plants that’s in an easy-to-use liquid concentrate that’s ideal for hydroponic use. The Pro-Tekt Silicon Solution: * Adds mechanical strength to stems * Helps improve heat tolerance * Helps improve drought tolerance Dyna-Gro Pro-Tekt is recommended for all plants. It contains potassium and 2% Soluble Silicon to reduce stress caused by heat, cold & drought. It’s safe for plants and effective for use in soil & soilless media. For best results, use in conjunction with the Dyna-Gro nutrient family of products.