1. Select the appropriate container: As mentioned this species need a lot of space to grow container size should you choose must be a minimum of 18 inches or more. The case you intend to plant giant sunflowers, the diameter of the container should be 24 inches. To prevent flood water in case the container of the sunflowers we should have several drainage holes in the bottom. With the container is not available, the character you create 3 to 5 1/4 inch holes in the bottom.
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