Rather than 'Lemon Daddy', I would look for Hydrangea quercifolia 'Little Honey', a golden leaved oakleaf hydrangea. I think the foliage effect is far nicer than that of a bigleaf hydrangea, it is a hardier plant and much more likely to bloom for you without winter protection, it is far more sun tolerant (Big Daddy scorches like mad in any sun), the foliage gets gorgeous fall color AND....the plant retains some foliage during winter, only shedding it as new growth emerges in spring. So it therefore looks more like a real plant in December than a collection of dead sticks. Such a deal!!

Here is a link that might be useful: Little Honey hydrangea (no source endorsement!)

Good rec - but I already have a pretty large swath of oakleafs in that bed ("Alice" or "Snow Queen", don't remember which), so that would be just too much oakleaf.

Highly recommend Hydrangea little honey!

Look at Leucosceptrum japonicum 'Gold Angel' as another alternative if you decide not to go with Lemon Daddy.