Flowers frequently are used to communicate a special message when an individual wishes to leave a memorable impression on a friend, family member or romantic partner. According to the Savannah River Ecology Laboratory, there are about 250,000 types of flowering plants, so plenty of blooms are available to convey emotions and sentiments, including "thank you." The sender merely needs to choose the flower that accurately communicates his feelings.

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Receiving beautiful blooms makes the day a little brighter.

Rose

While roses are most often used to say "I love you," these popular and beautiful blooms convey other messages as well. Gratitude and appreciation may be expressed with roses, too, but different colors communicate slightly different meanings. For example, dark pink roses are ideal for saying "thank you," peach petals note appreciation as well as sincerity, and any mature rose fully in bloom conveys gratitude.

Sweet Pea

Originally grown in Italy, sweet peas (botanical name Lathyrus odoratus) are fragrant flowers with pink, lavender, white or bi-colored petals. They are climbers and are at their showiest when creeping upward on a trellis or other construction that allows them to reach their full height (about 10 feet). Sweet peas say "Thank you for a lovely time." They add interest when placed in a mixed-flower bouquet, but are also attractive when presented in a cluster of only sweet pea blooms. These plants do well when planted in the ground and in containers outdoors.

Hydrangea

Hydrangeas say "Thank you for understanding" and can be used to express general gratitude for a caring act. These flowering shrubs originated in Japan and are grown throughout most of the United States. An array of colors are available--various shades of blue, pink and white--and presenting a loved one with freshly cut flowers in an attractive vase or as a dried arrangement is a good way to let her know you appreciate her compassion.

Campanula

Many species exist under the genus Campanula, but most varieties are called by the common name, "bellflower." Campanulas can be used to state a simple "thank you" or to express gratitude. These flowers are typically blue, white or lavender, mimicking bell, star or cup shapes. When growing directly in the ground, these plants flourish for months, from spring through summer.

Camellia

Flowers in the genus Camellia are native to Japan and China. Varieties such as Camellia japonica and Camellia oleifera can be used to express gratitude. These large, rose-like flowers exhibit an assortment of colors (pink, white and red) that contrast nicely with dark green foliage. Camellias are evergreen shrubs that provide winter interest in a garden, so they may be viewed as the gift that keeps on giving all year long.