Mustards grow best as a very early spring crop or a fall crop. However, last year Mustard 'Golden Frill' held for most of the summer--and it was very hot and dry.

Mustard probably does not have any problems in the 80 degree range. I have volunteers of Southern Curled (Ostrich Plume) and Savannah ( a Tendergreen type) That stand until the temps climb into triple digits. It does not bolt, but it will burn out at high temps. Seeded past the early spring it does not seem to bolt.

Southern Curled bolted on me last summer. I had high hopes because my neighbor had beautiful mustard right through summer the previous year. Like many gardeners I know (except for the ones on this forum), she pays little attention to varietal names, so doesn't remember what it was. I suspect there are different strains of Southern Curled. I wonder if that could account for my experience with it. I could try it from a different source.

I'll keep trying, as I do like greens. At least I can have a fall crop.

Jim

I have Green Wave which is fine right now and really cranking actually. But Red Giant has disappointed me as I saw flower spikes on it just today, and I don't even consider it to have gotten full-sized yet. Years ago I grew something called southern giant which I recall did quite well in the heat, and I may return to it. Green Wave, by the way, is something you keep planting every few weeks in smallish patches. Keep it cut down by adding it to your lettuce blends as you gather salad greens, and do not wait for it to get big and bad for steaming because it will get tough and bolt. You can steam the small leaves, though, and they are good that way too.

My Green Wave was recently planted, so I don't know how it will turn out here. I'm just guessing based on Carol Deppe's book. She is a fan of that variety but says a late spring planting will bolt too early.

I need to consider, and probably trial, the ones suggested by lacyvail and farmerdilla.

Many Asian greens are mustards. I had late spring planting of yu choy bolt quickly last year, which was disappointing. That's another store, which I discussed on the Asian Vegetable forum and am working on with help from a GWer over there.

Jim