My sweet marjoram is shrivelling up. I've unwrapped the leaves to see if there are holes or bugs or webs or...but nothing.
Don't see any bugs on it or anything. It is in one end of a window box with a rosemary which looks fine. Does anyone know what it could be?
It has received a lot of rain two weeks ago but not lately and it is in full sun on the north and east side of our house so it gets morning and midday sun but not afternoon sun.

T Landsaw
Zone 6b, 7a
Heat 8

Check to see how wet the soil is. This could be the problem. Sometimes when plants get too wet, the "Turgor"
(water pressure) can get high enough to make the stems (especially green ones as opposed to woody stems)
the stems become more readily breakable than they would be if the water levels are totally normal.

So I'm trying to say the you could have a water logged plant OR

A plant that has more water than it is used to, the stems got brushed against/handled normally and the stems broke, so look for broken stems. I hope this helps. I working late and my brain is on ER drive.

There is the possibilty that the postion of the majoram in the planter box is on a dry end. You have a roof overhang that prevents the rain from watering it?
Also, rosemary takes awhile to show signs of stress...when it does ( and it can take a fair amount of dryness) it will drop all of its leaves suddenly.
Planter boxes have to be watched and watered almost on a daily basis. They dry out very fast.
I'd pull the thing up and look at the root ball...dry is what I suspect. I've been there umpteen times X a thousand. Dry rootball-abuse.
Also, it could be that the majoram was root bound when you bought it. This means roots are real tight and don't absorb water too well...if at all.