* Subject: "Several herbal plants grown in our kitchen garden"
* This is the part of the sentence that tells us who or what the sentence is about.
* Predicate: "have great medicinal properties"
* This is the part of the sentence that tells us what the subject does or is. It describes the action or state of being of the subject.
Here's why it's a little tricky:
The sentence has a complex subject with a phrase within it ("grown in our kitchen garden"). This phrase modifies the noun "plants" and tells us more about which specific plants are being discussed.