Rabbit

Gardens are springing up everywhere - providing snack bars for woodland creatures all over the globe.  Here's a question that came in last week:

"Dear Gardenerd, I am starting a garden in my back yard.  I would LOVE to
convert my useless front lawn into an edible estate but can't spend
thousand of dollars on a fence to keep out the wild rabbits.  Do you
have a simpler suggestion to keep the rabbits at bay? Thanks, Caroline"

I can make a few suggestions, but honestly a fence is the best answer. 
Rabbits burrow, so any fence you put in needs to go down at ...