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Stages of Sunflower Development (A1145)

This publication provides an overview of the main growth stages of sunflower with pictures for clarification.

Reviewed by Hans Kandel, Extension Agronomist

A.A. Schneiter, former NDSU professor, J.F. Miller, former USDA-ARS, D.R. Berglund, emeritus NDSU extension agronomist


Description of sunflower growth stages

The total time required for development of a sunflower plant and the time between the various stages of development depends on the genetic background of the plant and the growing environment. When determining the growth stage of a sunflower field, the average development of a large number of plants should be considered. This staging method also can be used for individual plants. The same system can be used for classifying a single head or branched sunflower. In the case of branched sunflower, make determinations using only the main branch or head. In stages R7 through R9, use healthy, disease-free heads to determine plant development if possible because some diseases can cause head discoloration.


Vegetative Emergence

VE

V-E


Heading

Vegetave Stages


v2

V-2

V4

V-4

V12 Line Art

V-12


True Leaf 4 cm

True leaf — 4 cm


Heading

Reproductive Stages

R1

R-1

R2

R-2

R-2 Line Art

R-2   Less than 2 cm

R3

R-3

R3 Line Art

R-3    More than 2 cm

R3 Top View

R-3 Top View

R4 Top View

R-4 Top View

R51

R-5.1

R55

R-5.5

R59

R-5.9

R6

R-6

R7

R-7

R8

R-8

R9

R-9

From Schneiter, A.A., and J.F. Miller. 1981. Description of Sunflower Growth Stages. Crop Sci. 21:901-903.

Reviewed and reprinted May 2013

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