Garden plants with white flowers include lily of the valley, Queen Anne's lace, paperwhites, gardenias and cup flowers. Trees with white flowers include Japanese crape myrtle, California native buckeye and Yoshino cherry. These plants create certain effects in the garden, especially at night.
White flowering plants come in annual or perennial varieties. Not all white flowering plants grow well outdoors in all regions. Many varieties, such as paperwhites, don't do well in cold weather and need to move indoors in winter. Some varieties turn brown if sun, temperature and soil conditions are not ideal. Trees with white flowers do better with full sun.