I'd look at 'Mrs G.G. Gerbing' as a possibility. Could even be the one you are currently growing. An older variety but a very heavy bloomer and still considered the standard bearer for white flowered, southern indica azaleas.

here are tips from the Azalea and Rhododendron Society for propagation https://www.rhododendron.org/propagation.htm

Thank you very much, john and gardengal!

I will look into propagation if it's not too difficult.

The flowers of Mrs. G.G. seem to be a little larger than what we have but it's definitely close.

Assuming the cuttings work, I wonder how long it will take for the azalea to grow to anything noticeable.

Depending on the variety and many factors, it may take several years (5++ maybe). Try to contact the prev owner to see if they can help. Also, look around the area where those azaleas are planted to see if you find old identification tags; you might get lucky looking under the mulch but do not disturb the tiny roots as they grow in the top 4" of the soil. Another idea would be to visit as many plant nurseries in Spring as you can - when the azaleas have arrived- to see if you find them for sale (maybe also take photos too to see if an employee can recognize your azaleas).

Oh, all those plans have changed.

We will have a whole front yard makeover (sodding, front bed etc), so they will replace all azaleas. The landscaper suggested 10 George Tabors, but if anyone knows of another variety that performs similarly for Georgia but is pure white instead, I would be grateful for some suggestions.

Pretty much any variety of white azalea will work perfectly well in all parts of the south, so take your pick of whatever white flowered one is readily available. Some are more or less heat/sun tolerant, some stay compact while others grow larger and bloom times can vary, so pick according to your needs and conditions. The Mrs. G.G. Gerbing already mentioned, Gumpo White, Alaska, Glacier, Everest, several Encore varieties, Bloom-A-Thon White...........all possibilities

From my prior years in Atlanta, any azalea that I planted in morning sun only was a happy azalea! I would transplant those existing azaleas elsewhere instead of throwing them away. They do produce a lot of blooms!!!

Gardengal,

Do all of those grow around 6 feet tall? We also need them to be somewhat tall growers. Maybe he suggested George Tabor because of height ?

luis,

They used to...but they are so scraggly now.

that would be one heck of an undertaking to transplant azaleas that big, good luck with that

Gerbing azaleas should be easy to find and should reach 6ft tall, if they really like their spot they may even get a little taller. Personally I'd mix it up a bit, throw a tabor in there

If you are looking for something with white flowers, gardenias would be a great alternative, can stand more sun and heat and should flower twice a year and sporadically in between, plus they smell awesome.

"that would be one heck of an undertaking to transplant azaleas that big, good luck with that"

Actually, it's not much of a big deal at all ;-)) Like other rhodies, azaleas have a very shallow, mat-like, pancake of a root system. Even very large ones are not all that difficult to move. We can grow rhodies the size of a doubledecker bus here and they transplant relatively easily and very well.

Ditto over here, except for the double decker size comment (hee, hee, hee). In East Texas, they can attain huge sizes too but, here, maybe less than 10 feet or whatever their max is supposed to be. and they are still easy to transplant, provided the plant is dormant and provided you get as much of the roots as you can. A second person to help is always a good idea.

To tell you the truth, I'm still scratching my head as to why you would want to add to what you already have and make it a hedge.

The beauty of any plant is in it's individuality, just like children. (jmho)

Theddeus,

I needed more on the other side of the stairs, which is not visible in these pictures. That bed was empty. Also, these are older pictures, and the azaleas you see here no longer looked that good. They were almost bare at the bottom, really scraggly. We since took them out and planted GG Gerbings all across. They will take a while to mature to the right height, but it was the best thing to do for uniformity across the bed.

As for beauty - there's beauty in individuality, and there's beauty in hedges (or families). :)