Delizy doesn't ball for me here on the Central CA coast. It isn't "humid" but there is sufficient marine influence for many roofs to be green with moss/algae and many mornings the dew makes it appear as if it's rained. I have consciously avoided roses which are known for balling issues. The Teas which resist balling for me are Mrs. B. R. Cant; Devoniensis; George Washington Richardson (Mlle de Sombreuil); Niles Cochet; Maman Cochet; Jesse Hildreth; William R. Smith; Rosette Delizy; Bassoues Tea; Edith Perry; Faith Whittlesey; Mme Antoine Mari; Mons Tillier; Moser Striped Rose (Rainbow); Mrs. Dudley Cross. The Tea-Noisettes doing well are Lamarque and Marechal Niel. Balling completely negates the suitability of the variety for breeding, so if they ball, they don't come home with me. General Gallieni and Marie van Houtte will arrive next month. Neither has the reputation for balling. We shall see.

Kim, we almost always had to remove the guard petals on 'Marie van Houtte' blooms. Just that one outer row of petals.

I also garden in a warm but not humid part of CA. I have seen some balling on tea roses, but only in very wet (rainy) Springs. I have grown Rosette Delizy for 20 years, and have never seen any balled blooms.

Jackie

Thank you, @jerijen. I have changed the order to Mme Lombard.

It's pretty humid here in Summer (around 86% I believe, this Summer), and very wet recently. I'm sorry to say that Rosette Delizy balls here. I got rid of an earlier plant because of this, but was tempted to try it again in a different spot. It still balls, but not so badly. I don't know why it balls less where it's planted now. It will probably not get the chop this time, as I love its colourful blooms. I've had Marie van Houtte for over 10 years, and very rarely see a balled bloom. It's huge shrub, and rarely without blooms. Who knows?!

Mrs Dudley Cross balls here a bit, but not worryingly so. Ms Tillier doesn't ball, but I do find the blooms are smaller in Summer in it's present dryish position. Previously I had it growing in a spot that got a lot of run-off, and the the blooms were always large. It also grew like topsy there -9' high and 15' wide in three years.

Kim, you know that 'Mme. Lambard' does mildew here. Never balls, but it DOES mildew. I don't care. I'll always grow it.

Well, there is only one way to figure out what it will do here and that is to try it. You had mildew issues with Ping Dong Yue Ji and it doesn't mildew here. Eugene de Beauharnais is clean there and rusted like all get out here. Jesse Hildreth is clean there and mildews here. Bassoues Tea was clean until I had to prune the daylights out of it to clear the path. It's regrowing and appears to be working its way through the mildew the pruning induced. So, who knows until we try?

Is Bassoues tea, the same as any of the other teas?

Who knows? It looks very much like Isabella Ducrot to me. https://www.helpmefind.com/rose/l.php?l=2.34638

Mme Lambard is my healthiest rose. It's also huge and hardly ever without a bloom. I agree with Kim, you can't tell always by others experiences, even in very similar climates.

I lived in North Central Florida for years, the capital of heat and humidity, and had very little trouble with Rosette Delizy balling. Many roses ball more in wet cold nights than wet warm nights. RD came with me to the PNW where she is also growing well with very little balling, though I suspect that RD didn't enjoy our couple of single digit nights this winter. Despite being know for our grey sunless days, our summers are fairly dry. I like her growth habit, more restrained than many of the teas. I also appreciate that mine clone is almost thornless and the leaves are almost always clean of diseases.

Great thread; balling is a thing that I can't stand for, since my whole garden is about the spring flush. But it DOES seem to be difficult to predict; for example, I've heard that all the Cochets have a tendency to ball,and yet here is roseseek saying that for him the Maman and Niles resist it! Go figure...

Bart, it does seem to be you have to try a plant to really know. Then, it is just that plant in that spot. Maybe a different plant in a different spot would be totally different. You never know.

The teas that balled for me, based on cool morning fog throughout the summer, were Maman Cochet, MFK and its sport, Blumenschmidt.

MFK is the most fantastic rose here. It tolerates heat probably better than any rose along with Anna Olivier and Madame Antoine Mari. I realize this comment is not about balling but an FYI.

I’m also in the Houston area. I’ve had my Rosette Delizy for just a couple of years, but it has never balled.

I live in FL on the coast and Rosette Delizy does great here.