Corn growth stages based on leaf number are usually described using the “V-stage” vegetative system developed for agronomy and crop science. The system is widely used by universities such as Iowa State University and Purdue University.
The stages are written as:
- VE = emergence
- V1 = first leaf with visible collar
- V2 = two leaves with visible collars
- V3 = three leaves with visible collars
- etc.
The “V” stands for vegetative growth.
The key point is that the stage is counted by leaf collars, not merely visible leaf tips.
A leaf collar is the light-colored band where the leaf blade joins the stalk.
Example:
- If 6 leaves have visible collars, the plant is at V6
- If 12 leaves have visible collars, it is at V12
After vegetative growth, corn enters reproductive stages:
| Stage | Meaning |
|---|---|
| VT | Tasseling |
| R1 | Silking |
| R2 | Blister |
| R3 | Milk |
| R4 | Dough |
| R5 | Dent |
| R6 | Physiological maturity |
A simplified progression looks like this:
| Stage | What You See |
|---|---|
| VE | Plant emerges from soil |
| V1–V5 | Early seedling stages |
| V6–V10 | Rapid vegetative growth |
| V12–VT | Ear and tassel development accelerates |
| VT | Tassel fully emerged |
| R1 | Silks visible |
| R6 | Kernel maturity |
A few important agronomic details:
- Around V6, the growing point moves above the soil surface.
- Around V10–V12, ear size potential is being strongly determined.
- Nitrogen side-dressing is often recommended near V4–V6.
- Herbicide labels often specify maximum V-stages.
There is also an older method called the “leaf-tip method”, where every visible leaf tip is counted. That method often overestimates stage compared to the collar method and is less precise.
Example:
- A plant may have 8 visible leaves but only 6 collars:
- Leaf-tip method = 8-leaf corn
- Collar method = V6
Modern agronomy usually prefers the collar method because it better correlates with plant physiology and management timing.
This Purdue University image gallery has a clear close-up image labeled “Leaf collar”:
Purdue University Corn Leaf Collar Image Gallery
This Purdue article also contains diagrams and photos explaining the collar method and identifying the light-colored band:
Determining Corn Leaf Stages (Purdue Extension)
