Why Did We Choose These Selections?
Scions:
Sunflower
Noted to flower and produce fruit in 4^{th} year in Princeton, KY trial.
Susquehanna'
Slow to flower and to come into production.
Seedling rootstocks:
Cultivars vigorous: Sunflower and PA-Golden
Cultivars lack vigor: Susquehanna and K8-2
Commercial mixed seed: RVT
Studies with seedlings in containers
Seed size and genetic background important