When the tree needs to be re-potted.

Hawaiian Schefflera/ Umbrella Tree

Schefflera arboricola

When the tree becomes almost root bound or doesn't drain properly it needs to be re-potted. Bonsai soil is very coarse, with many spaces for air. It is good for the long-term health of the plant. Fine material has to be removed to avoid compacting the soil, which would exclude air. Think about the weather your plants will experience. Get soil advice from a bonsai grower who lives in one's area.

Schefflera arboricola

Highs are above 90 degrees F and lows above 50 degrees F, now is the time to re-pot tropical plants.