F-1's are the first cross between a Native and a Florida. They are 50% of each. When they breed, their babies will not be F-1's. If you have natives, and you add pure Florida's, (and if they last a couple of winters) the babies that the Floridas have with the natives will be F-1's. If you buy F-1's, and they breed with the natives, their babies will not be F-1's.
But adding Florida strains to your existing populations will help them. Just dont expect to continually have F1's being born.
