OK, I have been lazy. This is the question I am supposed to ask during summer time.
I planted oregano in the garden and in several containers.
In the summer time, half of them are suddenly dead about the same time. The whole plant turned to deep brown.
It looks like it got burned in the fire.

I am in zone 8a. There are a couple of wild tall trees in my community had the similar problem at least by the look of them. All the leaves withered and turned deep brown standing in the midst of green.

I am just wondering if my oregano died due to lack of water and hot temperature. Or it is some kind of spreading disease?

Thanks

I am in zone 8 also, up in the Pacific NW. I have oregano planted directly in the ground, and it is one of the plants I chop back every spring so it does not over extend its range. It gets full sun and random extra watering in July and August when I think about it. I have found it to be a very strong plant - mine is O. vulgare. I've had less luck with the fancier cultivars.

I can't keep it alive in the summer in Phoenix. Where are you, Kevin, and what are the temps when this is happening?

LizDTM said:I can't keep it alive in the summer in Phoenix. Where are you, Kevin, and what are the temps when this is happening?

I am in Charlotte. Summer time is less than 90.

I would suspect moisture levels being the issue. Did they dry out too much? If the ones in ground died, remember the tree roots will really draw moisture from plantings.

Zone 8a here and in summer we become too dry. I have oregano and marjoram in large containers and leave them out year around. In containers so I can keep them watered through out the dry part of summer.

I say don't give up...

It shouldn't die from heat at that temp.