Why Gladiolus Numbers Decline Each Year

Overcrowding from Cormels Is the Usual Cause

Gladiolus "bulbs" are technically corms, and they produce numerous small cormels around the base. If left undivided, these offspring compete fiercely for nutrients and space, causing the original planting to dwindle.

Annual Division Keeps Them Vigorous

1. Dig corms each fall after foliage yellows.
2. Separate the cormels from the mother corm.
3. Replant the largest corms; discard or grow on the smallest.

Other factors like wet or compacted soil can also reduce numbers, but overcrowding is the most common reason gladiolus plantings fade over time.