Types of Bulb

Gardeners refer to several distinct plant structures as flower bulbs in everyday conversation. 

  • True bulbs – Rounded, pointed top, flat base where roots grow: AlliumAnemoneBluebellDaffodilHyacinthSnowdrop, Lily, Tulip
  • Corms – Similar to bulbs, with buds on top and roots from the base: Crocus, Gladioli
  • Tubers – Swollen roots like Dahlia, or swollen stem bases: CyclamenAconite
  • Rhizomes – Horizontal, swollen stems, growing on or just below the soil: Bearded Irises, Lily-of-the-valley, Cannas

From a planting season perspective, bulbs / corms / tubers / rhizomes are handled one of 4 ways:

  • Dry, dormant bulbs are planted in Autumn
  • A limited range of bulbs are planted in growth (In the Green), in early Spring
  • Tender species like Dahlias are best planted into warm soil in late Spring
  • Some late season bulbs like Nerines and Colchicums can be planted until the end of Summer

For convenience, flower bulbs are commonly classified as Spring or Summer flowering.

Leave a comment

Your email address will not be published. Required fields are marked *

Back to top