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How to Grow Gladiolus Bulbs Indoors

By Jenny Harrington ; Updated September 21, 2017
Gladiolus is available in a range of flower colors.
gladiolus yellow flowers image by Maria Brzostowska from Fotolia.com

Gladiolus are one of many summer bulbs grown to add color to the garden. They also thrive as a container plant. Gladiolus are often used as a cut flower in in bouquets and vases, but instead grow these bulbs in pots indoors as a living flower arrangement. Gladiolus comes in a variety of colors, with blooms growing along tall flower spikes. Indoors, consider one of the smaller miniature gladiolus varieties, as these are more suited to pot culture.

Fill a 10 to 12 inch diameter pot with a well-draining, moist potting soil. Leave a 1 inch space between the top of the soil and the rim of the pot.

Plant each corm 2 to 4 inches deep and space them 2 inches apart in the pot. Plant the bulb with the flat side down and the pointed side facing upward.

Water from the top immediately after planting, watering until the excess moisture drains from the bottom of the pot. Water in this manner whenever the soil surface begins to feel dry.

Place the gladiolus pot in a warm room in a window that receives at least six hours of sunlight a day. Avoid placing it near air vents or other places where the plant may receive cool drafts.

Fertilize the gladiolus every two to four weeks throughout the growing season with a balanced houseplant fertilizer. Follow package instructions for exact application rates.


Things You Will Need

  • Potting
  • Potting soil
  • Bulbs
  • Fertilizer


  • Gladiolus actually grows from a corm, which is similar to a bulb. Many seed suppliers and garden centers lump gladiolus with other summer bulbs though.
  • Gladiolus may need stakes to prevent the flower stalks from flopping over. Use bamboo skewers or plastic plant picks in pots.


  • If your gladiolus is not blooming it may not be receiving enough warmth or sun indoors. Place it outside in a sunny area for a week or two to encourage it to bloom.

About the Author


Jenny Harrington has been a freelance writer since 2006. Her published articles have appeared in various print and online publications. Previously, she owned her own business, selling handmade items online, wholesale and at crafts fairs. Harrington's specialties include small business information, crafting, decorating and gardening.