Leave the plants outdoors in their pots where you plan on placing them before transplanting. This gets them accustomed to their new growing environment.
Transplant the shrubs and other plants into the ground after a few days. The hole you dig should be a bit wider than and the same depth as the pot the plant comes in.
Fill any extra space left in the hole after transplanting with extra topsoil.
Water regularly for a week or two to allow the plants to get established. Allow the soil to dry between the waterings.
Fertilize the new plants once a week with a balanced fertilizer until the plants show new growth. Each fertilizer has different solutions and concentrations, so follow the instructions listed on the product for proper mixing.
Water and fertilize less frequently as the plants become more established.This helps the plants to become more accustomed to natural watering by rainfall. Eventually, after this weaning process, the plants will thrive on their own.