The vibrant yellow evening primrose can grow up to 2 metres tall, although in most cases they won’t exceed 90 centimetres in length. The plant is nocturnal by nature and as a result the corolla only opens in the evening and promptly closes in the morning. They prefer growing in full sun in neutral, well-drained soil that stays moist.
Regular pruning will help to get rid of dead leaves and spent blooms. This way you can also collect the seeds to plant during the next season.