Common Sunflower

(Helianthus annuus annual Composite)

Sunflower the Crop

374t.JPG (14091 bytes)  The crop sunflower looks like the annual weed, but is much more robust with a bigger seedhead.

323t.JPG (10357 bytes)  These sunflowers were planted by my old garage in Canada.  The gradient of heights (left to right: increasing height) is due to the gradient of light (left to right: increasing light quantity) that the plants received.

 

Sunflower the Weed

Seedlings emerge.  Is the seedling on the far right suffering from herbicide injury?  Which herbicide caused it?

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Sunflower seedlings injured with acifluorfen, a diphenyl ether herbicide:  1479t.JPG (12106 bytes)

Sunflower leaves (left) and seedling (right) injured by bentazon:  1523t.JPG (10294 bytes)  1525t.JPG (12145 bytes)

Notice the sunflower seedling growing in this bag of hardened cement (below), now that is a hostile habitat.  Weedy adaptation is amazing sometimes.

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Stems and leaves:

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Flowers and seedheads.  Notice how the weedy seedheads are much smaller than in the crop.  Human selection and adaptation at work.

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©jdekker-1998

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