Wish spells are spells that can make a wish come true for you or for others. There are many ways a wish spell can be cast, whether be with a candle, herbs, or anyway you want the spell to be cast.
Keep in mind, as cliche as this may sound, be careful what you wish for. Also, do not wish for outrageous wishes like to be able to fly or turn yourself into something you're not because chances are it will not come true.
Some wishes that can be considered legit are to wish for the safety of others, protect someone, or simple wishes for money or love.
Herbs that are good for wishing:
-Bay Leaves (Write your wish on the leaf and burn it)
-Spearmint (Write a wish on paper and wrap it in spearmint leaves; place in a red cloth and sew with red thread, then keep in a safe and secret place -- by the time the scent is gone, your wish should have come true.)
-Sage (Write a wish on a sage leaf and place it under your pillow for 3 nights -- if you dream of your wish, it will come true; if not, bury the leaf in the ground so that no bad will come to you. )
Thanks to: http://www.themagickalcat.com/Articles.asp?ID=242 for the herbal properties. Credit goes to them for said properties.
I hope this was able to help you.