- How to Grow Allium Bulbs Alliums are essentially blooming onions – no, not the ones you might find in your local chain restaurant, but rather,flowering bulbs that compliment any late spring garden. Unlike more common fall planted/spring blooming bulbs such as tulips and daffodils, the allium is a curiosity that is sure to impress and inspire for years to come. Also known as ornamental onions, Allium is ideal for making color and height combinations in the border. Most alliums flower in June, just after the real spring flowerers, and before most summer flowers comes into bloom. They therefore form an indispensable perennial that keeps the border in flower well into the year.
