Definition - What does Blood Meal mean?
Blood meal is a source of organic, nitrogen-rich fertilizer that often comes in the form of dry powder. Blood meal is sourced from animal blood, often from cattle or hog blood, and is a slaughterhouse by-product.
In cannabis cultivation, blood meal is used sparingly to stimulate vegetative growth in young plants, both seedlings and clones.
Blood meal can also used as a natural pest deterrent for outdoor plants, as it is believed that the smell of the substance is unappealing to larger animals like moles, deer, and squirrels. Likewise, it can also attract certain kinds of pests like dogs, possums, raccoons, and other omnivorous animals.
Hydrolife explains Blood Meal
Blood meal contains high amounts of natural, non-synthetic nitrogen, making it ideal for organic cannabis gardeners needing an organic fertilizer source. In addition to nitrogen, blood meal also contains smaller amounts of phosphorus and potassium, and can raise acid levels in the grow medium. Application can be carried out in a number of ways; since it is water soluble, blood meal can be dissolved in water and used as a liquid fertilizer. It can also be mixed into soil, or sprinkled on top of the soil.
As it is in a powder form, blood meal releases nitrogen quickly, so considerable caution must be used so that sensitive seedlings don't get fed too much. Excessive amounts of nitrogen can prevent plants from flowering or fruiting by burning the plants, or possibly killing them altogether. Blood meal should be used carefully, and instructions on its application should be closely followed.
Blood meal is commonly used in soil grows on plots of soil that have been through repeated plantings where low levels of nitrogen need replenishing.
Cannabis growers can find blood meal at big box stores, hydro shops, local nurseries, and feed stores.