Flowers do not change their scent; however, their bouquet may fluctuate in strength because of the climate. Cooler temperatures cause a flower’s scent to become more heady and noticeable. Warmer weather can weaken a flower’s smell. Some flowers only release their fragrances at night or in the early morning hours. The amount of pollination the flower receives is also a factor in the strength of the flower’s aroma. Too much pollination causes the flower’s perfume to fade.
Morning Glory (Ipomoea tricolor)
The morning glory is a trumpet shaped flower that greets gardeners in the morning with a pleasant scent. The dark blue or purple 6-inch buds close in the afternoon and evening hours and only last one day. These annual flowers grow on vines that reach 10 to 20 feet in length. They have heart shaped dark leaves. The morning glory is a native plant of Mexico, Central America and South America. They are easy plants to grow and quickly cultivate in warm tropical weather.
Four O’Clock (Mirabilis Jalapa)
Four o’ clocks are native flowers to South America but have become residents of the southern part of the United States. This flower can be found in the gardens of Thomas Jefferson at Monticello. These flowers usually are a single color but sometimes have multi-colored trumpet shaped blossoms that are 1 inch in diameter and 2 inches in length. They grow out of a leafy shrub that is a multi-branched, 24-inch tall perennial plant. This plant blooms from spring until late fall. In the late afternoon the plat releases its sweet fragrance, which is similar to the jasmine flower.
Angel’s Trumpets (Datura innoxia)
Angel's trumpets have 6-inch large white flowers that flourish on an annual vine. The plant grows 3 to 4 feet tall and is the same dimension in width. The leaves of the plant are a bluish-green color and emit a foul smell. Angel's trumpets have aromatic white or pale lavender flowers that open during the summer at night and stay blossomed into part of the day. These flowers are native to the southwestern United States and Mexico. Unfortunately, the plant is poisonous and has narcotic qualities. Thus it should be placed away from the reach of children and pets. Some communities have banned its cultivation in home gardens.
Roses come in many varieties and grow in various conditions. These flowers vary in fragrance as well. Most roses smell the strongest on mild and humid mornings. The flower’s scent strength grows weaker as the day progresses due to essential oils dissipating in the heat. Although roses are the United State’s national flower they originate 35 million years ago in the region where Iraq is now located. Rose breeders have developed multiple new scents with hybrid roses.