Try oats: they love eating the shoots.
When you buy “cat grass”, it’s oats.
Just get some whole oats from your local health-food store, & plant ‘em, & let your friends eat the stuff to their hearts’ content:
it’ll do their health good, too!
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I’m interested in seeing an answer to this, too.
For terpenes, please try Ajwain seeds. or pine-needles.
I prefer pine-needles: the ajwain seeds are just too strong.
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Oh, maybe search PubMed for the specific plants you’re considering?
That might provide some medical research papers…