Mycorrhizae Fungi . This is optional, but is a great thing to sprinkle on the roots before planting. The fungi live as beneficial parasites on the roots and allow the plant to become much more efficient at absorbing water and nutrients. Lime and rock phosphate. You will want to have a cup of each per bush you are planting.
Rock phosphate is great for root development.
Some like to also add a cup of gypsum to break up clay soil, but if you are planting in a prepared bed, the gypsum should not be necessary. If you are not working in a prepared bed, you will need additional organic amendments, such as horse manure, compost, or well-aged cow manure. A shovel and any other digging implements. Newspaper to use as a weed barrier. Beware that chocolate may be poisonous to dogs, so if you have dogs or visitors, you probably don't want to use cocoa shell.