Pepper -The name Pepper may refer to any of the many different types of peppers out there. Peppers are often spicy hot.
Petal -As in a flower's petal.
Petunia -A Petunia is a fragrant flower
Pomona -Pomona is a Latin name meaning "fruit tree" referring to apples. Pomona is the Roman Goddess of Fruit.
Poppy -A Poppy is a colorful flower. Some species produce heroine.
Ren -Ren is a Japanese name meaning "water lily" or "lotus".
Rhosyn -Rhosyn is a Welsh name meaning "rose".
Rowan -The name Rowan is Gaelic and it means "little red one". It is the name of a tree.
Rue -There are several meanings for the word rue from which this name is taken. It is a a small shrubby plant, it is a verb meaning "to be remorseful of" and as a German name Rue means "notorious".
Rye -The name Rye refers to the plant, rye which is used in cooking, baking and the brewing of whiskey.
Saffron -The name Saffron refers to the spice or to the color yellow
Sage -The name Sage refers either to the aromatic herb Salvia spp or to one who is wise.
Sakura -Sakura is a Japanese name meaning "cherry blossom" the symbolism of this is fleeting beauty.
Samara -A Samara is the winged fruit of a maple tree.
Sorrel -Sorrel is a plant with a tart flavor.
Tansy -The name Tansy derives from the Greek meaning "immortal". It is also a useful plant. See The Witchipedia for more information on the tansy herb.
Thorn -The name Thorn refers to a thorn on a plant.
Vernon -Vernon is a name of Old French origin meaning "alder grove".
Note the root Vern- as in "Vernal" which means "of or pertaining to spring".