If I'm using Miracle Gro potting soil, how much blood meal should I use?
You really shouldn't need any if you are already feeding with the Miracle Gro. You should normally use this fertilizer on nitrogen starved plants/soil. The best way to tell if you need to add blood meal is to have your soil tested. This article will also help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/blood-meal-fertilizer.htm