Whether to use annuals or perennials, what perennials to use for different flowering effects, and how to take care of the perennial garden are important questions, the correct answers to which make for the success or failure of a flower garden. A flower garden in itself is the intimate companion either of those who own it and enjoy working in it, or of those who are only sufficiently interested to be thoroughly satisfied when an interesting flower effect is produced. There is no part of the field of landscape design, from the standpoint of the professional designer, from which so much criticism can arise as through the failure to produce an interesting flower garden. It is useless to discuss the question of taste, concerning the individual preferences for various colours of garden flowers; yet to everyone the successful garden implies a garden filled with flowers. The proper relationship between the unusual types and unusual effects becomes a secondary and yet an important consideration.
The success of a perennial planting does not rest entirely with the proper selection and proper planting of perennials. A perennial garden cannot stand still. It cannot be made to-day and exist tomorrow without some care. Many gardens in which the types of plants have been selected with extra care have completely failed because whoever was responsible for their subsequent maintenance has not understood the nature and requirements of the plants with which he was dealing. The general rule can be laid down for the success of any perennial garden that the one who assumes responsibility for its success must be as intimately acquainted with the plants, their habits and requirements, as with the members of one's own family.