Check out the following; though it appears as I remembered: Yellow Delicious; early blooming, yet mid-to-late season ripening. It can be pollinated by Lodi
(which is basically the same apple as a "Transparent.") I'd plant a stand-alone Yellow (or Golden
, same thing) Delicious, and graft a branch of Transparent / Lodi onto your Gravenstein. Transparent is an excellent pollinator for Gravenstein's.
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Rootstocks aren't my 'specialty,' I understand them - but have to look each one up. I generally go for a more vigorous rootstock than most, due to clay soil and deer problems...
And remember, you can always graft something later ripening to your Yellow Del. I think it has a long enough bloom time to cover most varieties - but do check.