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Allium Serendipity is one of the best flowering ornamental onions available today. This hybrid cultivar flowers in the summer rather than spring-like its otherornamental onion relatives. Planting this perennial in your garden is a great way to extend the bloom time of alliums. Allium Serendipity blooms in mid-summer and produces large globes of rose-purple flowers. As the plants mature, they will have dozens of flowers that look like purple orbs floating through the garden. This flowering onion is a clump former so expect the clusters to increase in size year after year. When the foliage is bruised, this plant will emit an onion fragrance to your garden—a Proven Winners Introduction.