Not an expert but I think the bud browning is because it's just too hot. You might want to give it some shade in the hottest part of the day. Often the first buds on mine look like that when they start trying to bloom in late July when it's so hot here. The stems with the buds look like gonners, but you can see there's new growth. Maybe trim back to where you see new shoots coming out from the sides of the stems (Right where a leaf would join you could see a little shoot poking out) and then let the plant recover.

Since you are in a hot place the plant will still need plenty of water like your other potted plants.

Excellent advice, Seranata. I was going to write the same exact thing: cut off dead parts so the plant doesn't put anymore energy into damaged buds. It will bounce back quickly.

Looks like they just remembered to water it, after the plant just about gave up hope.

If it is really hot, be sure to plant it in the soil as soon as possible so the black pot doesn't end up cooking the tuber.