Did you get the tissue cultured plants? Or it is the normal plant pots in LFS? I assumed the sealed pot related to the tissue cultured plants.
Regarding your queries:
1. The tissue cultured plants is quite fragile since the stems are small and delicate. So planting technique is also part of the success for planted tank. If the stems got damage, the whole plants might not develop /spoiled. So far, when I buy the tissue cultured plants cup, just observed if all the plants there are healthy with green leaves and not having any signs of wilted or yellowish.
2. If after 10th day, you still can see no sign of deterioration of leaves, means the roots underneath might still developing. Just monitor and see any new coming leaves. Some plants are slow grower. It needs sometimes to get use to the environment and catch up.
BTW, the Pogostemon erectus is quite sensitive as per my experience, the stem is very soft and if not careful, we might damage it and it might melt. Just remove the melting part to prevent the melt spread to healthy part. Cut the tips which are still healthy and replant those stalks. It probably can save the plants.
Patience is the key.
Hope your plants doing well.
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