Egg shells will not help a plant grow faster because the nutrients they provide must go through the process of mineralization where they are broken down into a more usable form. This process can vary in length of time based on soil, temperature and moisture conditions.
About this Author
Theresa Leschmann has been writing since 2005. Her work has appeared in the "Southern Illinois Plus" and on numerous websites. She is a property manager who writes about gardening, home repair, business management, travel and arts and entertainment topics. She is pursuing an associate's degree in English from Oakton Community College.