The main part to remember is that they will need more fertilizer than usual during the flowering and afterwards too. You can use your normal bonsai fertilizer for this purpose. They also need to be checked that they have enough water while in flower as it can drink more than normal while they are there.

On some bonsai trees the flowers turn into fruit afterwards such as apples or cherries. It is not recommended that you let the bonsai grow fruit every season as it can really put a drain on it’s resources. It takes an immense amount of sugars and nutrients to create fruits so it should not be taken they it will be able to grow them often. It’s best to pluck them off when still small if you can.

The key points:
1. Make sure it’s got enough water
2. Fertilize more regularly
3. Remove fruits