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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.

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Haiku

Grey marsh, black cloud...

Flapping away in autumn rain

Last old slow heron. ~ Anon

Random Bonsai Tip

Use vinegar and water to remove moss but it is not as effective as using Limestone Ammonium Nitrate (LAN) and water. Be very careful not to spill any of the LAN on the roots of the bonsai tree as it may burn them and may in the worst case cause the tree to die. Carefully paint the LAN and water mix on the trunk of the bonsai tree and within days you should see the moss turn brown and die.