I've heard bat guano can leave a taste behind after flushing and that seabird guano can be a better alternative. Same ingredients, no bad taste
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Types of Guano.
Bat guano comes in different types. The N-P-K ratio of the guano is dependent on what the type of bat it came from and what it’s diet consists of. For instance, Mexican bats eat bugs so their guano is high in nitrogen. While Jamaican bats feed on fruit, so their guano is high in phosphorus. Lets explore some different types of guano and their application.
Mexican Bat Guano (10-2-1). This type of guano is very high nitrogen. This makes it perfect for the vegetative stages of growth. Even when the plant is young it can be fed a dilute mixture if the soil happens to contain very little nutrients. This type of guano can be used throughout the vegetative stage of growth.
Peruvian Seabird Guano (10-10-2) This type of guano is NOT bat guano. It comes from Peruvian seabirds and is then transferred into dry-pellet form. This type of guano, because it is not from bats, is very “hot”, meaning it will burn plants very easily if prepared incorrectly or over applied. Do not exceed the recommended amount when preparing the tea and allow it to sit for at least 72 hours before feeding your plants. This is 24 hours longer than bat guano because the pellets are harder to break down as well as the high potential for burning the plants otherwise. Peruvian Guano is both high in nitrogen and phosphorus making it ideal for the transitional phase of growth when you are finishing the vegetative phase and beginning to flower. The nitrogen will sustain the plant through it’s initial stretch and the phosphorus will allow for root expansion and as a result better yields. On a side note, many people have poor results with this type simply because they do not prepare the tea properly or let it sit long enough the end result being damage to their plants that is beyond repair.
Jamaican Bat Guano (1-10-0.2) This type of bat guano is high in phosphorus. It is perfect for the early-mid flowering cycle once females are well established. I like to use this type for most of my flowering phase in conjunction with Fox Farms Tiger Bloom at ½ strength for massive blooms.
Indonesian Bat Guano (0.5-12-0.2) This type of guano is the ultimate low-nitrogen, high-phosphorus bat guano. It is perfectly suited for the end of the flowering cycle before the final flush. This drops nitrogen levels low to cut growth and signal the autumn harvest as well as provide a huge resource of phosphorus to bulk up buds and add to trichome count.
In conclusion, you can now see that bat guano is perfect for growing your own clean organic cannabis. It is easily customized to every stage of the plants growth from seedling to harvest. Organic gardening is by no means an exact science. Depending on your atmosphere, light, and type of plant you may need to feed more, less, or perhaps amend your feeding water with something that bat guano does not contain, for instance to stabilize pH etc. However you grow, remember it is a life affirming process to grow and smoke your own cannabis do NOT base your grow on calendars, weight, and dollar signs, as such things are truly insignificant to this process.