Hibiscus plants have a voracious need for potassium. Without adequate potassium, flowers will grow paler, smaller, less frequent in their blooming - gradually diminishing in every way. It is not a fertlizer, and it is not a nutritionally complete product. It is an organic counterpart to our Hibiscus Booster, used to provide supplemental potassium to increase bloom numbers, size, and coloration. The levels of potassium in Seaweed Extract are lower than in our booster, but this product, if used diligently, will raise potassium levels. In addition to potasssium, kelp is a rich natural source of over 60 chelated trace nutrients, vitamins, amino acids, and hormones that stimulate plant growth.