Answer: Petunia seeds can take up to 21 days to germinate, depending upon soil temperature. The usual causes for failure to germinate are seeds planted too deeply (and they run out of energy before the stem reaches the soil surface), or fluctuating soil moisture. Once a seed begins to sprout it needs constant moisture. If it dries out, it will die. You might want to poke around in the soil to see if you can find any signs of life from your seeds. If not, you can sow fresh seeds in the same soil, or start them in a smaller flat in a more protected location. Once they have grown to have several sets of leaves, you can transplant them to the larger container. Hope you have better luck the second time around!
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