I have been conducting growing trials on garlic (no breeding of varieties done as plants do not produce fertile flowers) and have tested over 150 types since starting this work in 1991. Two aspects of varietal improvement that I am working on are:
a. Growing from bulbils in an attempt to produce disease-free seed; and,
b. Observing for natural mutations and growing these to determine their permanence, and, if so, improved characteristics.
The latter has shown promise in at least one case and I have 6 more types in various stages of testing.
I am certainly willing to share this information, and although it doesn't fall strictly under the definition of plant breeding, it does provide the equivalent data for a vegetatively propagated plant.
Paul Pospisil, Garlic Research,
Small-Plot Garlic Variety Trials,
3656 Bolingbroke Road,
Maberly, Ont. K0H2B0