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White/yellow cotyledons leaves, curling

grovestead
10 years ago

My tomato starts were doing great until a few days ago they wilted due to a missed watering (my bad). They revived quickly, almost within an hour. I put them on the germination heating mat overnight thinking it wouldn't hurt and the next morning the soil was dry again and there was a yellow-whitish color on the cotyledon leaves.

I watered thoroughly again and took off the heating mat but the discoloration has persisted after several days.

Thoughts?

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