Willard & May Gladiolus Flower Bulbs

This refers to the circumference of the bulb. A 12/+ cm size is considered jumbo, meaning the bulbs are mature and nutrient-rich, which typically results in stronger stems, more robust foliage, and larger, more reliable blooms compared to smaller grades.

Yes, gladiolus thrive in containers as long as the pot is deep enough to support their height and has excellent drainage. Ensure you use a sturdy pot, as the tall flower spikes can become top-heavy and tip over in windy conditions.

Because these grow 36-48 inches tall, they can be susceptible to leaning or falling over in high winds or heavy rain. It is highly recommended to stake them or plant them in a sheltered spot to keep the flower spikes upright.

Gladiolus are generally hardy in zones 3-10, but they are not winter-hardy in colder regions. If you live in a zone where the ground freezes, you will need to dig up the corms in the fall after the first frost, dry them, and store them in a cool, dark place until spring.

For a dense, lush look, space the bulbs 6-9 inches apart. If you want a continuous show of color throughout the summer, try planting a new batch of bulbs every two weeks rather than planting all 50 at once.