Is hyssop obligated in orlah?
Question
What is the halachic status of hyssop (a.k.a. za'atar) vis-a-vis orlah?
Answer
Dr. Mordechai Shomron, agronomist | 24 Tammuz 5785
Hyssop ("za'atar") is a woody perennial. For this reason, the prohibition of kilei zera'im does not apply, but on the other hand, neither does the orlah prohibition.
For a list of herbs and their classification as trees or vegetables, see here.