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A Sunflower Investigation

In addition to us each growing our own sunflowers under normal conditions (planted in soil, kept in direct sunlight and watered) we also decided to investigate if each of these factors - soil, sunlight and water were actually important to plant growth at all. To test this, we planted 4 sunflower seeds under different conditions. One was planted in sand instead of soil, one was planted in soil but given no water, another was planted in soil and watered but kept in complete darkness and finally one was planted in soil, left in the sun but as fed with Pepsi rather than water. Which one do you think will be the most successful? Do you think any will grow at all? 


It's been 2 weeks since we planted our seeds now and just over a week since the seeds germinated. (Click here to see how our other sunflowers are doing) You can see in the photos below that the seeds have all germinated in our 4 experimental cases but they have not grown into particularly healthy looking plants. The 'sand plant' is quite small has flopped down, unable to stay up. The 'dry plant' germinated but hasn't got much further than than. The 'dark plant' is tall but very thin, has only one set of very small leaves and is a very unhealthy looking yellow colour. Finally, the 'Pepsi plant' grew very quickly (even quicker than our individual plants) but although it is tall, it's very thin and floppy - so much so that we have had to prop it up with a stick.

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