Why You Should Put Your Trees on the Ground

On the ground and mulched:

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The "bonsai temperature" probe is in the substrate of an Acer p. The "outside temperature" is actually a bit high - it's just coming from a weather service, and I know it was lower than 12 last night (local weather service said 7°F). I have another sensor on the way to be more accurate.
 
I keep mine on the ground and mulched in summer and in winter for exactly that reason. Just make sure the pots can still drain.
 
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