These onions are really the result of a cross between two species and then reproduced vegetativelly for generations. Diversity must be very big, so one or two rounds of selfing won't be a problem. You can also let them cross with other varieties.
The main problem with these and garlic is that they accumulate virus. Just by growing from seed should show a big increase in vigour.
Once a plant is not propagated by seed for many generations it tends to loose its ability to make seeds. Potato onions or garlic are perfect examples.
|