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You have the right instincts.You have the right instincts. Sunflowers need lots of sunshine and they are also love heat and tend to be hot, dry-weather plants. For that reason, they really do prefer to be outside in all the sun and heat. Do you have a balcony that allows the plant to get sun on all sides? If you are going to grow your sunflower in a pot, it's best to have a pot at least 15" deep because they like to send their roots out. In a container, you may need to water more than once a week; make sure the soil is moist not soggy; notice when the leaves start to wilt as this means it's thirsty. To perk it up, give the plant about a half dose of fertilizer food every other week.

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