Humboldt Nutrients Humboldt Honey ES is a premium blend of cane molasses, yucca, kelp and ocean fish, this carb source is as unique, as it is strong. The ES means Extra Strength. It increases brix levels by providing sugars to beneficial bacteria, fungi, and your plants. By using our thick premium Humboldt Honey ES in conjunction with our nutrient feeding schedules you not only enhance the quality, flavor and quantity of your crop, but you maintain all the healthy microbial life present in the plants digestive system, the root zone and surrounding soil.