The exact time frame of these stages varies slightly depending on the type of sunflower. Germination stage: Sunflower seeds take about 7 to 10 days to germinate. During this time, the shell of the ...

‘Sunflowers take between one and three weeks to germinate but once they get going, they tend to grow fast.' 'However, the ...

American Journal of Botany, Vol. 15, No. 1 (Jan., 1928), pp. 65-76 (12 pages) 1. Irradiation of sunflower seeds by X-rays does not result in increased rate of germination, increased percentage of ...

Sunflowers are not just available in the traditional ... Sown outdoors in April, seeds will quickly germinate and by mid-summer you will have a flowering screen that will also provide armfuls ...