I looked this up on Google, and found some reading that should help you -

https://www.google.com/search?client=firefox-b-1-d&channel=tus2&biw=1093&bih=445&ei=8STcXoGtOMbXtAap9qqgAw&q=Has+anyone+tried+Hydrangea+Invisibles+Spirit+II+variety+in+Dallas%3F&oq=Has+anyone+tried+Hydrangea+Invisibles+Spirit+II+variety+in+Dallas%3F&gs_lcp=CgZwc3ktYWIQDFCbrAFY7ZUCYMSoAmgAcAB4AIAByAGIAYkQkgEGMC4xMi4xmAEAoAEBqgEHZ3dzLXdpeg&sclient=psy-ab&ved=0ahUKEwjB6fGVqu7pAhXGK80KHSm7CjQQ4dUDCAs

Same as all other smooth hydrangeas. It needs morning sun until 10am-11am tops. No afternoon sun and no evening sun. Or it can be in dappled sun. You can also try in full but very, very bright shade.

If it gets too much shade for too long of a period (month or so during El Nin~o Events), the lack of sun may affect the bloom colors; I once had Annabelle's lime green blooms from the start until late Fall when the blooms just turned from lime green to brown (no white). Too much direct sun will make the white blooms turn pink faster. Or they could go brown faster. If temps get too hot, it may interrupt the sepals' color progression and go directly to brown.

Smooth hydrangeas are extremely sensitive to summer heat stress and will wilt and pout if allowed to get dry (keep the soil as evenly moist as you can) or if temps get warmer than 85F. Obviosly, it is winter hardy enough for our area. I saw Spirit I for sale locally eons ago and, for the price, it did not trip my trigger so I have been looking for Number II locally to see what do I think of II versus I. Let me know if you find it locally. Oh, its soil needs to be amended either once a year or twice (optional in some years). They tolerate alkalinity very well if you amend the soil once or twice a year.

On the other hand, it may perish if not watered during dry winters. If you get one now locally, start watering at summer watering levels (not spring watering levels) as we are close to starting the daily 100s. Try 1.5 gallons now per watering per plant and see if it gets the soil moist down to 8" or so. It needs this extra water when temps are above 85F. Needs 2-4” of mulch (no rock mulch) past the drip line, all year around. One of my Annabelles croaked when my drip irrigation was not working one winter (it is deciduous so I discovered the problem when other evergreen shrubbery showed water distress signs).

Oakleaf hydrangea is more drought tolerant but cannot be permitted to sit in soggy soil for “too long” or it gets root rot.

If you are going to order by mail, request delivery by October, as temps tend to stay in the 100s until the first half of September and you do not want the plant delivered under those warm conditions.

Although the stems are stronger than those of Annabelle, that does not mean that Spirit II is immune to flopping; it could still flop if it takes a good hit from a few strong enough thunderstorms/rains.