Sproutly Plant Care Team
Practical indoor-plant guidance for home growers. Pages are reviewed when updated and focus on clear diagnosis, safer care habits, and realistic household conditions.
Plant Glossary
What Is Corm?
Last Updated: June 2026 - Roots & Storage
Definition
A corm is a short swollen underground stem that stores energy and can produce new shoots and roots.
Quick Facts
| Plant term | Corm |
| Category | Roots & Storage |
| Common example | Alocasia often produces small corms around the main root system. |
| Care takeaway | Look for small firm corms near the roots when repotting alocasia. |
Why It Matters
Corms are storage organs that help plants regrow. In houseplants, alocasia corms are especially popular because they can be separated and sprouted into new plants.
How to Identify It
- ->A corm is firm, compact, and often rounded or teardrop-shaped.
- ->Alocasia corms are usually found near the root system during repotting.
- ->Look for a small growth point; mushy or hollow corms are unlikely to sprout.
Care Notes
- ->Look for small firm corms near the roots when repotting alocasia.
- ->Sprout corms in moist but airy conditions such as perlite, moss, or a light mix.
- ->Avoid burying corms in soggy dense soil because rot can start quickly.
Examples
Alocasia often produces small corms around the main root system.
Gladiolus and crocus are classic outdoor corm examples.
A corm is solid inside, unlike many layered bulbs.
Corm vs. Bulb vs. Tuber
Alocasia growers often say “corm,” but it helps to know what makes corms different from other storage organs.
| Structure | Inside Texture | Example |
|---|---|---|
| Corm | Solid, compact stem tissue | Alocasia, crocus, gladiolus |
| Bulb | Layered scales | Tulip, onion, amaryllis |
| Tuber | Swollen storage body with growth points | Cyclamen, potato |
Related Glossary Terms
Related Guides
Frequently Asked Questions
No. A corm is a plant storage organ, not a seed. It is a clone of the parent plant.
A viable corm is usually firm, not mushy or hollow. It may show a small growth point when ready to sprout.
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