Semi-double blooming plants are very common in gardens and landscapes. They are also called “twin” or “dual” flowers because they have two different types of blossoms (or petals) at the same time. Double flowers usually occur when a plant produces both male and female flowers at the same time. These plants are sometimes referred to as “pseudo-flowers.”
The term “semi-double” refers to the fact that these plants only produce one type of flower at a time. A true double flower would contain two separate types of flowers.
There are many varieties of semi-double flowers, but all of them fall into one of three categories:
1. Non-flowering plants with only one type of flower at a time.
These include sunflowers, dahlias, and other perennials. Some examples are the white daisy and the dogwood.
2. Plants that produce both male and female flowers at the same time.
Examples include roses, tulips, lilies, marigolds and others.
3. Plants that produce only male or female flowers at a time.
These include some vegetables, like broccoli and squashes.
Semi-double flowering plants
There are many different varieties of semi-double blooming plants. Some of the best known are:
1. Calendula (Calendula)
Calendula, also known as pot marigold or garden marigold, is a popular plant in many gardens. It is a hardy annual plant with daisy-like flowers and is easy to grow from seed.
The flowers range in color from yellow and gold to dark orange. The petals also have a slight orange or red blotches on them. Calendula grows up to 24 inches high and 12 inches wide
2. Carnations (Dianthus caryophyllus)
Carnations are another popular flower, often used for giving as gifts or in arrangements. They come in a variety of colors and are also popular for dried flower arrangements. Carnations have long been used for medicinal purposes as well. Both the flowers and the leaves can be used to make teas, tinctures, oils and poultices.
The carnation is a short-lived perennial that grows up to 12 inches high and 24 inches wide. The flowers bloom throughout the summer months. Carnations are native to the Mediterranean region but have spread worldwide.
3. Chive (Allium schoenoprasum)
Chives are a member of the onion family and are sometimes called “bunching onions.” They have a mild onion flavor and are used as flavoring in foods and for medicinal purposes. Chives are also edible and can be eaten raw or cooked in foods. The flowers of this plant are white, with purple streaks. They do not produce seeds and are propagated a clumps from its divided bulbs.
Chives can grow up to 24 inches high and 12 inches wide. They are hardy perennials and native to Europe but have spread throughout much of the world.
4. Crocus (Crocus species)
Crocus, or spring crocus, is a common name for about 30 species of flowering plants in the genus Crocus (saffron crocuses). They are among the first spring flowers and their purple, yellow, white, red and orange colors make them a welcome sight after a long winter.
Most crocuses are native to Mediterranean region but some species can be found in Tasmania and other far-flung places. They are hardy herbaceous plants that grow from corms and multiply every year through underground bulbs. They bloom in early spring, producing 1-6 flowers on each stalk.
Various species of crocus are popular garden plants, grown both for their flowers and their culinary value. The leaves and seeds are both edible and have a slightly nutty flavor. They’re great in risottos or as a replacement for herbs like thyme or oregano.
Spring is the best time to plant crocuses as they require chilling to stimulate flowering, much like the conditions in nature that are found at higher elevations or further north.
5. Daffodil (Narcissus species)
The daffodil is a common spring flower and one of the easiest bulbs to grow. It comes in several varieties, with the most popular being the jonquil, which produces flowers with golden cups and a bright green center, perfect for picking.
Other popular varieties include the trumpets and peruvian onions, named for their onion-like shape and scent. The “narcissus” part of the name comes from the flower’s strange fragrance, which is similar to the smell of narcissus flowers.
The daffodil is a hardy and versatile plant that can be grown both indoors and outdoors. They thrive in pots or in the ground, but require full sun to bloom properly. Daffodils grow from bulbs – ovoid shaped organs that are actually a little plant including stem, leaves and roots all wrapped up in a tiny package. When the bulb is large enough, it produces a flower stem that grows up to several feet tall before blooming. Once its finished blooming, it produces a seed head that resembles a tiny pine cone and then dies back down to the ground.
6. Crocosmia (Crocosmia species)
Also known as Montbretia, crocosmia is a genus of vibrant red, yellow or orange flowers that bloom in late summer.
Sources & references used in this article:
Note on the evolution of the double stock (Matthiola incana) by ER Saunders – Journal of Genetics, 1921 – Springer
Chrysanthemum plant by B Nurseries – 1946 – Google Patents
Phenological growth stages of Camellia japonica by P Vela, C Salinero, MJ Sainz – Annals of applied biology, 2013 – Wiley Online Library