The leaves are what show the most variation in the brassica oleracea family. Even though the stems are pretty much similar, the shape and size of the leaves are what make it different. Collard greens and Cauliflower have the same leaf shape and have a ration of about 20:22 and 11:14. Kale and cauliflower are different because the kale's leaves are long and thin while the leaves of the cauliflower are wide and very curved. The leaves of Kale are 24cm long and 12cm wide.
Artificial selection and selective breeding is when a person's natural curiosity makes them mix and match with a discovery of something like brassica oleracea. Different species were created by crossbreeding different plants to experiment. Modification occurs when organisms reproduce. This means that whenever a new generation is created the traits in the plants are mutated or adapted. Natural variations occur when plants mutate by themselves or die because of a new factor in its community.
The plants have stems that are a purple and green color and also have large leaves. Some of its traits work and can adapt to the environment so there is no point of changing the color. Cauliflower and kohlrabi have yellow blossoms. Those are what attract bees and bugs are responsible for pollinating them. Since that works, no change is needed for the plant.
If changing a characteristic is needed, plant breeders would need to find plants with the trait they want and breed it with other plants. A problem would be if the trait didn't yet exist, the plants would have to be genetically modified in order to be given the genes they want.
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