Miracle-Gro Tree & Shrub Food Spikes $12

This 12ct Pack of Miracle-Gro Tree & Shrub Plant Food Spikes drops from $15.49 to $12.35 at Amazon. It's one of Amazon's best-selling garden products every year, and we've been waiting for the price to drop. Just push the spikes into the soil around your trees and shrubs each spring and fall to feed them through the season. Compared to other highly rated tree fertilizers, these are pretty affordable, and I use them every year. Shipping is free with Prime or when you spend $35.