Petunia and Lemon Balm sprouted but dying in few days

In one smart Garden 3 -
2 petunia plants are coming up nicely - though one just dying -
petunia sapling in pod 3 is abnormal - all dry and withering .

Here are the photos:

petunia1 petunia2

In another smart Garden - 3 Lemon Balm plants were sprouted well but in a weeks time 2 plants died - wicks and everything looks fine also the water level is maintained correctly .
Here are the photos:

please let us know why this could be happening what could be done to avoid such wilting…

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2 posts were merged into an existing topic: Pests- Thrips