What is the version of the following sentence with correct punctuation?

The flowers are approx 25 cm long with a creamy yellow colour and a red eye in the centre They can start to flower in December but the main flowering season is in February and March
The flowers are approx. 2.5 cm long, with a creamy yellow colour and a red eye in the centre. They can start to flower in December, but the main flowering season is in February and March.