Miracle-Gro Plant Food Spikes great for use on all indoor plants, including edibles!. Our plants deserve the same nutrients as their outdoor counterparts. Food spikes are the perfect, mess-free option. They’re really easy to use to use the included miracle aerator to make a hole in moist soil halfway between the plant stem. And the pot rim. When natural growth cycles are lagging, plant food spikes can help enhance the growth process and target specific aspects of your plant, including its color, as well as stem and leaf growth.