When the plants are young, the flowers can be a bit heavy and fall due to their weight. Once the plant has matured, this won't happen, but pruning the plant for the first 1-2 years will encourage an even better framework for strengthening the branches. But in the meantime, flower ring stakes can help keep the flowers upright. Otherwise, a simple bamboo stake can be inserted to help support the weight of the flowers. The best time to prune the flowers is once they finish, which can be late autumn into early winter; often, this is when the plant has gone dormant.