... , USDA 4 Plant Growth Regulators..... Kelp Seaweed Extract Powder (CAS No.: 68917-51-1) Extracts from all natural ascophylum nodosum, Sargassum or Laminaria, Zostera ... plant growth regulators which, like traditional rooting products, can stimulate root growth in cuttings and transplants; • Increases fertilizer efficiency and fertilizer ...