Dahlia Dahlia 'Northwest Cosmos' (Sin)
ABOUT
Dahlia 'Northwest Cosmos' is a striking flowering plant known for its showy and vibrant blooms. The flowers of this dahlia variety are sizable and feature a stunning array of petals that can display a mix of colors, often involving shades ranging from deep purples and pinks to lighter lavender hues, which blend together in a gradient-like fashion. The petals are typically arranged in a symmetrical pattern that radiates from the center of the flower, creating a full and lush appearance. Each bloom stands out against the green foliage that serves as a backdrop for the spectacular floral display. The leaves of Dahlia 'Northwest Cosmos' are deep green with a characteristic shape that may be slightly pointed at the tips, with well-defined veins running through them. They are usually oval or lance-shaped and arranged oppositely on the stem, providing a bushy and robust look to the plant. The stems themselves are sturdy, supporting the weight of the large blossoms quite well. This plant typically blooms from mid-summer through till the first frost, offering a prolonged period of visual interest. The overall look of Dahlia 'Northwest Cosmos' is one of bold beauty and can be a centerpiece in any garden display.
About this plant
NamesFamily
Asteraceae
Synonyms
Dahlia, Garden Dahlia
Common names
Dahlia 'Northwest Cosmos'
ToxicityTo humans
Dahlias, including the Dahlia 'Northwest Cosmos', are generally considered non-toxic to humans. They do not typically pose a threat if touched or ingested in small quantities. However, it is possible for individuals to have allergic reactions or sensitivities to dahlias, which could result in mild symptoms like skin irritation or an upset stomach. It is always wise to refrain from eating ornamental plants as a general safety practice.
To pets
Dahlias, including the Dahlia 'Northwest Cosmos', are not known to be highly toxic to pets such as dogs and cats. If a pet were to ingest parts of a dahlia, they might experience mild gastrointestinal upset, such as vomiting or diarrhea. It is always advisable to keep an eye on pets and prevent them from eating plants since individual reactions can vary. If you notice your pet displaying abnormal symptoms after ingesting dahlias or any other plants, it is best to consult with a veterinarian.
CharacteristicsLife cycle
Perennials
Foliage type
Deciduous
Color of leaves
Green
Flower color
Varies
Height
4-5 feet (1.2-1.5 meters)
Spread
2-3 feet (0.6-0.9 meters)
Plant type
Bulb
Hardiness zones
8
Native area
Mexico
Benefits
General Benefits- Visual Appeal: Dahlia 'Northwest Cosmos' provides stunning blooms that can enhance the aesthetic of gardens and landscapes.
- Variety of Colors: It comes in a range of colors, which allows for versatility in garden design and color schemes.
- Attracts Pollinators: The blooms attract bees, butterflies, and other beneficial pollinators, supporting local ecosystems.
- Cut Flowers: They make excellent cut flowers with a long vase life, suitable for arrangements and bouquets.
- Seasonal Interest: Dahlias bloom from midsummer to fall, providing interest during a time when many other plants may be declining.
- Easy to Grow: They are relatively easy to cultivate, making them suitable for gardeners of various skill levels.
- Breeding Potential: Hybrid varieties such as 'Northwest Cosmos' can be used in breeding programs to develop new cultivars.
- Plant Structure: Their sturdy stems and bushy growth can add structure and fullness to garden beds and borders.
Medical PropertiesThis plant is not used for medical purposes.
Air-purifying QualitiesThis plant is not specifically known for air purifying qualities.
Other Uses- Dahlia petals are edible and can be used to add color and a unique flavor to salads and desserts.
- The tubers of dahlias can be used in cooking, similar to the way you would use a potato, after proper preparation to remove any bitterness.
- Dried dahlia petals can serve as a natural dye for fabrics, offering a range of colors from pink to yellow depending on the variety used.
- The hollow stems of dahlias can be used creatively in crafts, such as making natural straws for eco-friendly drink options.
- Dahlia flowers can be pressed or preserved in resin to create ornamental decorations or jewelry.
- The large, sturdy blooms can be used as natural bowls to hold small items or as part of a decorative centerpiece.
- In photography, dahlias provide an appealing subject due to their vivid colors and complex petal structures.
- You can create a homemade plant dye for temporary tattoos from crushed dahlia petals.
- Dahlias can be part of a compost heap, contributing to a nutrient-rich compost that can benefit garden soils.
- The sturdy stems of dahlias can be used as stakes or supports for other plants in the garden.
Interesting Facts
Feng ShuiThe Dahlia is not used in Feng Shui practice.
Zodiac Sign CompitabilityThe Dahlia is not used in astrology practice.
Plant Symbolism- Beauty and Elegance: Dahlias, including the 'Northwest Cosmos' variety, symbolize beauty and elegance due to their intricate petals and stunning blooms.
- Dignity and Stability: These flowers are associated with dignity and stability, perhaps because of their upright growth and the variety of forms they exhibit.
- Change and Variety: Reflecting the dahlia's diverse range of colors and shapes, they also signify change and variety, celebrating diversity in nature.
- Commitment and Bond: Dahlias are often used to express sentiments of commitment and a lasting bond, making them suitable for gifting to signal a long-term relationship or friendship.
- Inner Strength: Dahlia flowers may represent inner strength in the face of challenges, as they bloom from midsummer until the first frost, displaying resilience.
- Involvement and Participation: The layered petals of the dahlia might suggest involvement and participation, calling to mind an active engagement in life's various aspects.
- Creativity: Due to their elaborate petal patterns and bright colors, dahlias are sometimes used to symbolize creativity and inspiration.
WaterDahlias, including the 'Northwest Cosmos' variety, thrive best when they have a consistent moisture level in the soil. It's recommended to water them once or twice a week, applying enough water to soak the soil to a depth of several inches. This usually amounts to about 1 to 2 gallons per plant, depending on the size and weather conditions. It is important to avoid overhead watering to reduce the risk of fungal diseases; instead, water at the base of the plant. During hotter, drier weeks, check the soil moisture more frequently and water as needed to maintain consistent soil moisture without waterlogging the plant.
LightDahlias like 'Northwest Cosmos' prefer full sunlight for the optimal growth and blooming. They need to be in a spot where they can receive at least 6 to 8 hours of direct sunlight each day. They can tolerate some light shade, especially in hotter climates, but too much shade can lead to fewer blooms and leggy growth. The best spot for these plants would be an open location that is free from significant obstructions that cause shadows.
TemperatureDahlias such as the 'Northwest Cosmos' perform best in temperate conditions and can generally handle temperatures from roughly 60 to 90 degrees Fahrenheit. Extreme cold is not tolerated, and dahlias are susceptible to frost damage, so they should not be exposed to temperatures below 50 degrees Fahrenheit. The ideal temperature range for dahlias is between 70 and 85 degrees Fahrenheit where they can thrive and produce abundant blooms.
PruningPruning 'Northwest Cosmos' Dahlias is crucial for maintaining plant health and encouraging prolific blooming. Early in the season, you can pinch out the growing tips to promote bushier growth and more flowers. Throughout the blooming season, regularly deadhead spent flowers to encourage new blooms. After the first frost in the fall, cut back the foliage to a few inches above the soil line as the plant will enter a dormant period. Pruning is best done using sharp, sterilized shears to make clean cuts and prevent the spread of disease.
CleaningAs needed
SoilThe best soil mix for Dahlia 'Northwest Cosmos' is a well-draining, fertile potting mix with added organic matter such as compost or aged manure. A soil pH of around 6.5 is ideal for Dahlias, ensuring nutrients are readily available.
RepottingDahlias, including the 'Northwest Cosmos' variety, should be repotted annually, preferably in the spring when new growth begins. Tubers should be divided every 2 to 3 years to maintain vigor.
Humidity & MistingDahlias like 'Northwest Cosmos' prefer moderate humidity levels. It's best to maintain air circulation to minimize the risk of fungal diseases, which can occur in high humidity.
Suitable locationsIndoor
Grow Dahlias indoors in large pots with drainage, near a sunny window.
Outdoor
Plant Dahlias outdoors in full sun and well-draining soil after frost.
Hardiness zone
8-11 USDA
Life cycleThe life of a Dahlia 'Northwest Cosmos' starts with a dormant tuber which is planted after the last frost of spring. Once temperatures warm and the soil is moist, the tuber sprouts and begins to develop roots and shoots. The plant grows rapidly, producing a thick stem and lush foliage. Throughout the summer, the Dahlia buds and unfurls large, vibrant blooms that can be in various colors depending on the specific variety. After flowering, as autumn approaches and temperatures drop, the Dahlia 'Northwest Cosmos' begins to wilt and the aerial parts die back, with the tuber entering dormancy for winter. The life cycle can begin again the following spring, provided the tuber is stored properly during the cold season.
PropogationPropogation time
Spring-Early Summer
The most popular method of propagating the Dahlia 'Northwest Cosmos' is through division of the tubers, which is ideally done in spring when the new sprouts are visible. To do this, carefully dig up the clump of tubers after the foliage has died back post-frost, ensuring to minimize damage to the tubers themselves. Each section of tuber must have at least one eye, or growth point, from which the new dahlia plant will sprout. Use a clean, sharp knife to divide the tubers, making sure each division is a generous size to support new growth, typically a few inches in size or approximately the size of a small potato. Once cut, the tuber pieces can be dusted with a fungicide to prevent rot and then planted in well-draining soil with the eye facing upwards at a depth of about 6 inches (15 centimeters). Keep the soil moist but not waterlogged and wait for the warmth and magic of spring to encourage the new Dahlias to grow.
