premise: How to grow african violets indoors<br>Buy pre-rooted african violets at a nursery, greenhouse or retail store. Because many houseplant enthusiasts grow african violets as part of their collection, they are usually easy to find. It's best to grow the violets from a pre-rooted plant, as growing african violets from seeds can be extremely difficult.
hypothesis: Sowing african violet seeds should not be tried.
reason: The statement doesn't prohibit doing this or doesn't say it will never work. It just says it is difficult. Some people would be up for the challenge. But for many plant people, doing this would be futile because they don't have the patience, don't want to risk it, etc. It depends on how much you're into plants.