Allisa, you may have to grow many! There are a few things that breeders do such as cross a regular leaf and potato leaf (host) and so then early on you can if you regular leaf (since potato leaf gene is recessive)... There is lots of reading on crossing! But basically if you determine before you cross the traits that your looking for and can identify those traits (dwarfism is one) at seedling stage then you won't have to grow out everything...
Al
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