Undoubtedly gardens change with time. On the one hand, the elements that form the gardens can change with time, for example, water freezes and then melts. On the other hand, weather is also part of the garden landscape. For example, sun, shade, wind, and rain make possible the moonlight in the pine trees, the scattering and crisscrossing shadows, and rain falling on leaves.
Of course, among the factors controllable by designers, plants have the richest and the most obvious changes. Some plants' characters could express the time of the day, such as the short-lived epiphyllum (Epiphyllum oxypetalum), the hibiscus (Hibisus syriacus) that blooms at dawn and falls at dusk, and noon flower (Pentapetes phoenicea) that just blooms at noon. Some flowers bloom only in special meteorological conditions. For example, moss rose (Portulaca grandiflora) comes out in sunny days and closes when it is overcast.
The changes of life can be seen in the cycle of individual plants. For example, Chinese pines are plump when they are young, but vigorous when they are old. Plants, like other organisms, have finite life spans, Some can be as short as several decades, such as polar trees, while others can be thousands of years old, such as pine, cypress, and ginkgo. Because each specific species has its own life cycle, as time goes by, the appearance of the community will change. As time passes, plant species replace other plant species within ecological communities, leading to over all changes in the landscape. In the sense, within a day or a year, during the life cycle of individual plants and the ecological processes of entire plant communities bring rich changes to landscapes. Such changes are reflected not only in the plants themselves, but also the spatial characteristics formed by the plant's growth.
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