Examples of organic fertilizers are greensand, bat guano, cottonseed meal, fish emulsion, manure, and blood meal.
Blood meal is a powerful source of nitrogen and must be applied properly or it will burn your plants. Follow the directions on the label. Blood meal is dried blood usually collected from slaughterhouses and may not be acceptable to vegetarians or vegans.
Greensand is mined from deposits of minerals once part of the ocean floor. It is approximately 3% total potash, along with iron, magnesium, silica and as many as 30 other trace minerals. There may be some ecological concerns here.
meal is a by-product of cotton manufacturing.
Cottonseed will produce a slight acidic reaction; consequently, so is
usually used for fertilizing acid-loving plants such as azaleas, camellias, and
been used as a fertilizer for generations, be sure that any manure you but has
been well composted before you apply it your garden. I have used chicken manure
and horse manure that was well aged with some impressive results.
I personally like seaweed but then I live near enough to the coast to be able to get it but it does work wonders.
Fish emulsion is a balanced, organic fertilizer; however, it is a partially decomposed blend of finely pulverized fish so again vegans and vegetarians may not wish to use it.
your choice is, the proper use of an organic fertilizer and the occasional use
of a compost tea will give your garden the elements it needs to produce
beautiful flowers and healthy and hearty vegetables.