A lot of these questions were answered in this recent post... See bottom link.

In very hot and humid locales, dahlias tend to slow down blooming until it gets cooler.

I would be concerned that, if you are starting with an unsprouted tuber end of May, and might have a very hot spell that slows down the plant as well, you would not hit your special date.

With that said, TRY ANYWAY! You'll have a blast, as long as you have a backup plan and the stress is off!

I would suggest calling Swan Island and talking to them about your concerns and desires. They know their varieties inside and out, as dahlias is ALL they grow, and will give great suggestions about which ones to choose, as well as how to grow them in a booklet they send out with your order.

They also ship blooms all over the US, incidentally.

Hope this helps, and have fun in your wedding planning!

Cheers,
CC

Here is a link that might be useful: Wedding flowers

Growing dahlias for the first time and for a wedding are both daunting tasks. Order one of the Swan Island collections, specifically the ultimate cut flower collection and you will probably have some flowers for the wedding. We could propose hundreds of varieties in different colors and shapes but this collection is an excellent choice for a beginner.

Thanks for taking the time to answer, and for the advice!

I have not had good results from Touché. For me they rarely came out fully double so after trying it for several seasons I have now trashed it. My climate is also hot and dry in summer which tends to make dahlias open up in the center. Some varieties are more susceptible to this problem than others. You may want to consider varieties that are listed as being more heat tolerant. Check out the link below.

Here is a link that might be useful: Heat Tolerant Dahlias