How to repot your pond plants

Here Jeff from Sunland Water Gardens shows how to repot Pennywort. Pennywort is a great aquatic plant for your pond. Bog plants need to be placed in your pond in water no deeper than three inches over the pot.

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I planted pennywort in a closed terrarium and it took of very fast , some days ago I opened the lid to make some water evaporate as it had been closed for 2 years when I closed it back leaves started to turn yellow after trimming .Why?