The growing plants will take minerals and vitamins out of the soil,and if similar crops are grown repeatedly in the same place the soil will become ever more depleted.
To harvest the tastiest and best fruit and vegetables and the greatest abundance of flowers from your garden you will need an organic garden fertiliser.
If you have the facility to produce it, you can use compost which you produce in your own garden. If this isn’t possible, you have several other choices.
Manure and Guano
Manure or guano is one of the oldest forms of organic fertiliser used in both farming and gardening. If you have access to horses or other large animals you may be able to use their manure on your garden. It will, of course, have the disadvantage of being rather smelly.
You should also think about whether the animals have been raised and fed organically. If they haven’t, their manure could contain chemicals and hormones that you would not want in your organic garden.
An alternative natural organic garden fertiliser is bat guano. This is one of the richest and most concentrated fertilisers for the soil that you can find. It contains high quantities of nitrogen and phosphorous, and this is particularly good for flowering plants.
Bat guano is also said to be effective in neutralising or removing certain toxins from the soil. This makes it an ideal choice if you are converting a garden that has not been managed in an organic way previously.
Seaweed, or kelp, is a vegetable-based source of fertiliser for gardens. It is particularly rich in iodine, potassium and other minerals. If it’s used in its pure form, it contains no animal products and could therefore be more suitable for vegans and strict vegetarians than many other products.
Seaweed extract is often used to produce organic garden fertiliser. The extract may be mixed with water or with other products to increase its mineral profile.
Seaweed based organic garden fertilizer can help in promoting resistance to disease and will aid healthy root and seed growth in your plants. It is particularly good for leafy plants like tomatoes, bell peppers and corn. It has the advantage of delivering its nutrients in a form that is very easy for plants to absorb.
Worm castings are earth that has been ingested, partially digested and then excreted by worms as they pass through the soil. They can often be seen left as thin spirals of fine soil on the surface of beds. They make good organic garden fertiliser and are especially beneficial for the roots of plants including root vegetables and also grass lawns.
Worm castings will be formed naturally by the worms in your garden if you have plenty. If your garden is newly established or you want to increase the variety of worm castings, you can buy either the castings or live worms from garden supply stores.
A number of regular fertilisers will contain bone meal, but you can also find organic garden fertiliser that is based on by-products of animal farming including bone and blood meal. You can either choose a fertiliser that is 100% organic or one that is all natural but is not certified organic.
You may decide to choose the all natural option if you consider that your garden has some non-organic aspects anyway, for example from neighbours’ chemical sprays.
To make certain that your garden remains completely organic, you will want to use only 100% organic garden fertiliser.