They should have barley. For blackseed you should look to Punjabs grocery near john hopkins college near greenmount. They have it and its not expensive (3-6$ for a 12oz- 16 oz bag) ..or you can look to any other indian/pakstani grocery store. They usually carry it. But they do not call it blackseed. I think they call it black cumin. Ask them for help bc they also have black sesame seeds and it looks similar but they arent at all the same.
The last aisle, opposite where the refrigerated stuff is, is where you'll find seeds, beans, etc. I don't know if they have wheat, but I'm pretty sure they have barley.
Ask the store clerk, I think you will find that what you are looking for.
Sunfresh produce reisterstown rd
Maybe, try at Trade Joe store
Danish food👆
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