Plants should fit in with existing plantings and not just stuck anywhere. Many urban soils are shallow and of very poor quality. To grow plants these poor sites must be modified. Good top soil is often impossible to find in the city. The addition of compost adds nutrients, loosens the soil allowing roots to grow, absorbs water for future growth while allowing excess water to drain away.
Organic mulches are also important in moderating the environment of the plant's root system.
Ask for help as soon as possible to get the most benefit from their knowledge and experience. Planting new trees and shrubs is important and makes us all feel like we have done something positive for the environment. It is just as important to provide regular care for trees and shrubs others have planted. Urban plantings suffer more stress than the same plants growing in wooded areas. In hot, dry weather, annuals must be watered weekly.