It is best to place the olive tree in a cold greenhouse which is kept frost-free. If kept in a warm room in the house in winter the olive will suffer from lack of light and dry air what makes it very susceptible. Water the olive bonsai thoroughly whenever the soil gets dry but avoid constant wetness. Olive trees generally need as much sunlight as possible. In other words, the more light they have, the longer your olive tree will remain healthy and in its best condition. Although, a little shade can be tolerated with a few precautions
Technical specification
Ambient: Outdoor plant
Scientific name: Olea europaea
Temperature: Abundant light
Terrain: Outdoor plant soil mix, well drained
Watering: Almost dry out between watering.
Fertilizer: Universal fertilizer, liquid or granular