Vitex agnus-castus is a type of flowering plant, usually simply called vitex.
Mnemonic
[ji-] Jimmy Neutron is in [1] front of the [-(e)ng] English manor where he is harvesting 荊 vitex艹 flowers. They grow all along a 开 gate in the garden, and Jimmy goes around with a special 刂 saber to remove the 荊 vitex艹 flowers. He hopes to use 荊 vitex essence in making a new scientific medicine.