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