Answer: Seedlings do not require any fertilizer until they have some true leaves. Even then, seedlings do not need very much in the way of fertilizer, especially since they are not kept in their containers for very long. If you use an organic mix to pot them up, it may already include some of the most common nutrients in the form of blood meal, wood ashes, and so on. Many organic gardeners will supplement the soil mix with water soluble "fertilizers" such as weak solutions of compost tea or fish emulsion, for example, until the transplants are moved to the garden.
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