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This article may help: https://www.gardeningknowhow.com/edible/herbs/cotton/cotton-growing-kids.htm
Is there an up or down to the cotton seed?
No, here is an article with more information.
https://www.gardeningknowhow.com/edible/herbs/cotton/cotton-growing-kids.htm
When do you plant cotton seeds, and can you plant many of them in a container? Also, what fertilizers and how much sun exposure do they need?
Here is our article on how to plant cotton seeds:
https://www.gardeningknowhow.com/edible/herbs/cotton/how-to-plant-cotton-seeds.htm
They can be planted either outdoors or in containers. The article will answer the rest of your questions.
We do not usually recommend places to purchase seed. I would recommend going to local nurseries, and checking online for seed. This will be your best option.
