Bonsai calendar

This table reveals Bonsai care needed per month, around the year, for the Northern hemisphere. These care guidelines are general and mostly applicable for outdoor trees; specific guidelines per species of tree but also per geographical region should have priority.

Seasonal Bonsai care

January

• During the winter outdoor trees need to be well protected from freezing temperatures by covering them with insulating material (like layers of leaves, foam, etc.).

• Control deciduous trees (like the oak) for insects.

February

• Keep checking on insects; outdoor trees will consume little water but watering might be required in the absence of rain.

March

• Some deciduous trees start to grow again, like the ulmus.

• Most trees can now be left unprotected from freezing temperatures, possible insulating materials can be removed in late March (though depending on your locale climate).

• Most pine trees can be repotted late march.

April

• Most trees start growing, only a few tree species take more time (like the oak tree).

• The growth of trees indicates fertilization can be resumed, and trees can now be trained, pruned and repotted.

• For most trees this is the best time to start wiring; but mind that trees grow rapidly so check on your wiring so it doesn't grow into the bark.

May

• Trees that started growing late (Oak etc) can now be trained and repotted.

• Fertilization is important now.

June

• Regular pruning of new growth is necessary

• New growth will result in the trunk and branches growing thicker.

July

• The warmest month of the year; mind to check for watering regularly.

August

• A good moment to repot pine trees.

• Check your trees for bugs and insects.

September

• Collect seeds from trees; this is the moment!

• Fertilize outdoor trees for the last time, hardening off their growth and preparing them for the coming winter.

October

• Autumn colors for outdoor trees are spectacular

• Protect your trees from cold nights.

November

• Keep your trees well protected from freezing temperatures.

December

Keep checking your tree; they might require watering in the absence of rain.

Courtesy of BonsaiEmpire

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