Definition - What does Bone Meal mean?
Bone meal is a soil or grow medium amendment that is a mixture of both coarse and finely ground animal bones. Bone meal is mainly made from beef bones, but can be made from the bones of any commonly slaughtered animal.
Bone meal is primarily used as a fertilizer or soil amendment, particularly in organic gardening. It is an excellent source of phosphorus and calcium that is useful in cannabis cultivation during the vegetative stage of plant development. Because it is derived from organic ingredients, bone meal is safe to use on edible plants like marijuana plants.
In addition to bone meal, there is blood meal, a quicker release altertaitve to bone meal.
Hydrolife explains Bone Meal
In cannabis cultivation, bone meal is used primarily to provide calcium and phosphorus to plants and soil. Phosphorus helps marijuana plants to grow and effectively perform photosynthesis, while calcium promotes the formation of healthy plant cells, allowing plants to transport and process other elements throughout their systems.
Bone meal has several different benefits when applied to cannabis plants. One benefit is that bone meal takes a longer amount of time than blood meal to break down, which means it releases nutrients slowly. Bone meal should last the entire duration of a cannabis plant's growth cycle as it has a slow release of around six months. It does not dissolve in water.
When used in this way, bone meal provides plants with a steady dose of nutrients, rather than a quick burst. However, it's easy to overdo it with granular ingredients, so be conservative.
Like many fertilizers, both organic and chemical, bone meal is dangerous to certain pets, like dogs. For vegans, alternatives to bone meal include kelp meal or feather meal.
Bone meal is sold in big box stores and local hydroponics stores; directions for applications will vary from brand to brand. Bone meal can be mixed with the soil or grow medium at the beginning of a growth cycle, or added to a small hole before growing new plants or during transplanting.