How to plant gladiolus corms
September 13, 2023
Easy to grow summer-flowering bulbs (corms), gladiolus are popular additions to the garden where their tall vertical flower spires bring colour and excitement to the garden early in the season. Also a popular cut flower, gladiolus usually flower around 100 days from planting, which can mean year-round colour in some parts of Australia.
When to plant gladiolus corms
Plant gladiolus corms in late winter to early spring in most parts of Australia. In the Tropics and Sub-Tropics, corms can be planted year-round. If planting is staggered, flowering can be extended for several weeks or months.
How to plant gladiolus corms
Prepare the soil prior to planting by adding compost and aged manure. Plant around 10cm deep and 10cm apart in groups of 6-9 for maximum impact in the garden.
Place the corms flat in the hole with the growing point facing upwards. Backfill and stake at planting to avoid accidental damage to the corms when digging.
Gladiolus can also be grown in pots and containers.
Caring for gladiolus corms
Water regularly during the growing season. Allow them to dry out in late summer and early autumn once they have finished flowering. Apply a flower and fruit fertiliser in early summer.
Remove spent flower stems. Allow the leaves to brown and die off before cutting. Bulbs can be lifted for replanting next year, or left in situ in a free-draining soil in all but the coldest areas of Australia.
Pest watch
Protect and treat for aphids, thrips, snails and slugs.
