The timing of fertilizing seedlings depends on several factors such as the type of seedlings, the potting soil used, and the type of fertilizer.A good time is to watch till seeds developing their first set of true leaves. These are the leaves that appear after the initial set of cotyledons (seed leaves).

Once the seedlings have developed their first set of true leaves, you can start to fertilize them with a weak, balanced fertilizer solution to help support their growth.
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