Zeedman
Garden Master
Scape formation in a silverskin sub-type is unusual; those more often produce stem cloves. Hopefully the S & H Silver didn't get mixed up with something else.You've reminded me that I do have some bulbils from last year that I'd forgotten about (Crème De La Rasa and S&H Silver). I'm getting them planted today, along with Iowa Heirloom bulbils from Sand Hill (that I'd also forgotten), and they can grow inside for now. I didn't know about stem cloves. DH was taking care of the garlic under my guidance (a broken foot kept me from getting close to the garlic) and I didn't have the opportunity to notice if anything looked odd (S&H Silver is a softneck).
Anyway, I've given it a lot of thought. I'm going to allow this years crop to form bulbils and that will be my foundation stock going forward. There should be plenty of bulbils to share too! I won't grow garlic in that ground again. That ought to take care of it.
Allowing the hard neck scape & bulbils to mature will most likely reduce the bulb size. You might want to allow bulbils on only 1-2 plants per variety, and to cut the scapes on the rest for larger bulbs. The size & number of bulbils will vary depending upon the type of garlic. Crème De La Rasa is a marbled purple stripe sub-type, and will get larger bulbils (probably pea sized) but fewer in number, probably 10 or so. Rocambole sub-type bulbils are similar, pea-sized or a little larger. Porcelain sub-types get small rice-sized bulbils in large numbers - sometimes too many to count - so you would only need one plant for bulbils.
Although seed saving philosophy is to save seed from multiple plants to preserve genetic diversity, all garlic varieties are clones, so there is no genetic advantage to saving bulbils from more than one plant.