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Excessive moisture retension

Q: Some of my pots seem to be retaining an excessive amount of water after normal watering, and especially after a rainy spell. I know this is harmful to any tree, but do not know the cause of it. Should I repot those trees as an emergency measure?

A: It might be necessary to add sand or clay according to your particular needs and area to a general bonsai soil mix. If water still stands visibly 15 minutes after watering, I would recommend moving your tree to a larger pot with new soil added (of a faster draining type) and change the soil and repot at the correct time in spring. Otherwise, remove all moss from the ground cover to give the soil a chance to dry out between watering.