Gladiolus
Growing Gladiolus
Gladiolus are a summer garden favorite known for their tall spikes of colorful flowers. They grow from underground structures called corms, which are thickened stems that store nutrients and produce new growth each year. Gladiolus are easy to grow and make excellent cut flowers for indoor arrangements.
Where and How to Plant Gladiolus
Gladiolus grow best in full sun with fertile, well-drained soil. Sandy or loose soil typically produces the strongest plants. Avoid planting near trees, shrubs or building foundations where roots and shade can limit growth.
Plant corms in spring once the soil is workable, usually about two weeks before the last frost.
- Plant 6 inches deep in light soil or 4 inches deep in heavy soil.
- Space large corms about 7 inches apart.
- For longer bloom time, plant additional batches every few weeks.
Caring for Gladiolus
Keep weeds under control early, since gladiolus do not compete well. Water is very important and plants need about 1 inch of water per week, especially after several leaves have formed.
Tall varieties may need staking to prevent flower spikes from falling over in wind or rain. Adding soil around the base or using stakes and string can help support the stems.
Cutting Flowers
Gladiolus make long-lasting cut flowers. Harvest spikes when only one or two blooms are open, as the remaining flowers will continue opening indoors. Always leave at least five leaves on the plant so the corm can store energy for next year.
Storing Corms for Next Season
After blooming, allow plants to continue growing until foliage begins to fade. Dig corms about 4 to 6 weeks after flowering. Trim the tops, allow corms to dry for several weeks in a well-ventilated container, then remove old roots and corm remains before storing for winter.
With proper planting and care, gladiolus reward gardeners with vibrant color and beautiful bouquets all summer long.