Dahlia Dahlia 'Trengrove Millennium' (D)

👤 Non-toxic to humans
🐾 Toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Hard-care
dahlia 'Trengrove Millennium'


Dahlia 'Trengrove Millennium' features a stunning display of large, vibrant flowers that make it a popular choice among garden enthusiasts. The blooms exhibit a rich, deep color, often a mix of purples and pinks, creating a bold statement wherever they are planted. These flowers have a layered appearance, with rows of petals that sometimes curl at the edges, adding a sense of depth and texture to the blossom. Each petal is smooth and may have subtle gradients of color, with a more saturated hue at the base that softly lightens toward the tip. In the center of the flower, smaller petals and reproductive parts form an intricate, eye-catching pattern that contrasts with the larger petals. The foliage of 'Trengrove Millennium' consists of green, lance-shaped leaves that serve as a lush backdrop for the magnificent flowers. The stems are sturdy, supporting the weight of the blooms, which can be quite heavy due to their size and complexity. This dahlia has a bushy, robust appearance, creating a full and vibrant presence in any garden space where it is cultivated.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Garden Dahlia, Dahlia

    • Common names

      Dahlia 'Trengrove Millennium'

  • skullToxicity

    • To humans

      Dahlias are generally not toxic to humans, and there are no significant toxic effects reported for humans ingesting dahlias. Hence, the Dahlia 'Trengrove Millennium' is usually considered safe around people, and accidental ingestion should not cause serious harm. However, as with any plant, individual allergies or sensitivities can always be a concern, so it is advisable to avoid eating any plant parts unless they are known to be edible.

    • To pets

      Dahlias, including the Dahlia 'Trengrove Millennium', are considered non-toxic to pets such as dogs and cats. They are not known to cause serious illness if pets chew or ingest parts of the plant. However, gastrointestinal irritation, including mild vomiting or diarrhea, can occasionally occur if a pet consumes a significant quantity. Generally, these symptoms are self-limiting and resolve without the need for veterinary intervention.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      4-5 feet (1.2-1.5 meters)

    • Spread

      2-3 feet (0.6-0.9 meters)

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Attracts Pollinators: Dahlias like 'Trengrove Millennium' are known for attracting bees, butterflies, and other beneficial insects to the garden, which is vital for pollination.
    • Vibrant Blooms: Dahlias produce large, colorful flowers that add a burst of vibrancy to any garden and can be used in cut flower arrangements.
    • Long Flowering Season: They have a long flowering season, from midsummer until the first frosts, providing color and interest for an extended period.
    • Variety of Uses: Dahlias are versatile and can be grown in borders, containers, or as part of a cutting garden.
    • Easy Propagation: Gardeners can propagate Dahlias from tubers, cuttings, or seeds, although named varieties like 'Trengrove Millennium' are typically propagated vegetatively to maintain their characteristics.
    • Garden Design: With their structured form and height, Dahlias can add architectural interest to garden beds and landscapes.

  • medicalMedical Properties

    This plant is not used for medical purposes.

  • windAir-purifying Qualities

    This plant is not specifically known for air purifying qualities.

  • leavesOther Uses

    • Photography Subject: The vibrant and large blooms of the Dahlia serve as stunning subjects for photographers looking to capture natural beauty and intricate floral patterns.
    • Natural Fabric Dyes: Petals of the Dahlia can be used to create a range of natural dyes for fabrics, with colors varying depending on the mordant used.
    • Teaching Tool in Botany: The diverse forms and colors of Dahlia flowers make them useful for teaching plant genetics, hybridization, and flower structure in educational settings.
    • Culinary Garnish: The Dahlia’s petals, being edible, can be used as a colorful garnish for a variety of dishes to enhance visual appeal.
    • Art Inspiration: The unique form and color of Dahlia flowers provide inspiration for artists and can be found represented in various forms of art, including paintings and sculptures.
    • Decorative Displays: Beyond bouquets, Dahlias can be used in large-scale floral displays for events or public spaces due to their impressive bloom size and stature.
    • Eco-friendly Confetti: Dried Dahlia petals can be used as biodegradable confetti for celebrations, providing an eco-friendly alternative to plastic or paper confetti.
    • Botanical Illustration: Dahlias are often subjects for botanical illustrators, who capture the intricate details of their varied flowers in detailed drawings and watercolors.
    • Theme Gardens: Because of their diverse forms, Dahlias are ideal for creating theme gardens centered around specific shapes or colors.
    • Flower Shows and Competitions: Dahlia enthusiasts cultivate these flowers for showcase in competitive flower shows, where different varieties are judged on their beauty and form.

Interesting Facts

  • bedFeng Shui

    The Dahlia is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The Dahlia is not used in astrology practice.

  • spiralPlant Symbolism

    • Elegance and Dignity: Dahlias, with their intricate petals and stunning forms, are often associated with poise and a dignified presence, much like the refined atmosphere of an upscale, formal event.
    • Commitment and Bond: Because they are perennials that return every year, dahlias can represent a lasting bond or commitment, symbolizing a pledge or promise that endures over time.
    • Change and Diversity: With their myriad of colors, shapes, and sizes, dahlias symbolize diversity and variety, suggesting an embrace of change and unique qualities.
    • Inner Strength: These flowers are sturdy and can bloom through adversity, making them emblems of resilience and the ability to stand gracefully under pressure.
    • Creative Spirit: Dahlias inspire artists and creatives alike, with their wide range of hues and forms, conveying a spirit of innovation and creative thinking.

Every 3-4 days
2500 - 10000 Lux
Every year
Late winter - early spring
As needed
  • water dropWater

    Dahlias require a consistent watering schedule to thrive, especially during the growing season. Water the Dahlia 'Trengrove Millennium' deeply at least 2 to 3 times a week, providing about 1 to 2 gallons of water per plant each time. It's important to avoid overhead watering to minimize the risk of foliage diseases; instead, water at the base of the plant. During particularly hot or dry spells, you may need to water more frequently to maintain moist but not soggy soil. Cut back on watering as the plant begins to die back in the fall.

  • sunLight

    Dahlias need full sun to bloom well, so place the Dahlia 'Trengrove Millennium' in a location where it can receive at least 6 to 8 hours of direct sunlight daily. An ideal spot would be one that gets the early morning sun, which is less intense and helps dry dew off the foliage, reducing the likelihood of fungal infections. Avoid locations that are too shaded, as this can affect the plant's ability to produce flowers.

  • thermometerTemperature

    The Dahlia 'Trengrove Millennium' prefers temperatures between 60 and 75 degrees Fahrenheit for optimal growth. They can survive in temperatures as low as 50 degrees Fahrenheit but will stop growing if the temperature drops below this mark. Dahlias are not frost-tolerant and should be protected or removed from the ground if temperatures approach freezing. In regions with hot summers, provide some afternoon shade to prevent the plant from overheating.

  • scissorsPruning

    Pruning Dahlias helps to encourage bushier growth and more abundant blooms. For Dahlia 'Trengrove Millennium', deadhead spent flowers regularly to promote continued flowering. Additionally, pinching back the central stem when the plant is young (at about 16 inches tall) will encourage lateral branching. The best time to prune for shape is early in the growing season, and deadheading should be done throughout the blooming period.

  • broomCleaning

    As needed

  • bambooSoil

    Dahlias prefer well-draining soil with rich organic matter. A good soil mix for Dahlia 'Trengrove Millennium' is two parts garden soil, one part peat moss or compost, and one part perlite or coarse sand. The soil pH should be slightly acidic to neutral, ranging from 6.5 to 7.0, to support optimal growth and flowering.

  • plantRepotting

    Dahlias, including the 'Trengrove Millennium', should be repotted annually to refresh the soil and accommodate the growth of the tubers. The best time to repot them is in the spring after the last frost when you're ready to move them outdoors or after purchasing new tubers.

  • water dropsHumidity & Misting

    Dahlias like 'Trengrove Millennium' are not particularly humidity-sensitive, but they do best in environments with average humidity. Avoid conditions that are too dry or too humid as this can cause issues with growth and flower production.

  • pinSuitable locations

    • Indoor

      Keep Dahlias in bright, indirect light indoors.

    • Outdoor

      Plant Dahlias in full sun and fertile, well-drained soil.

    • Hardiness zone

      8-11 USDA

  • circleLife cycle

    The life cycle of the Dahlia 'Trengrove Millennium' begins when the tuber is planted after the last frost of the spring, as dahlias are sensitive to cold. It enters a vegetative growth stage, sprouting stems and leaves as it develops a robust root system. During the summer, it transitions into a flowering stage, producing vibrant blooms that may continue until the first frost of fall if deadheaded regularly. After flowering, the plant starts to yellow and wither as it enters dormancy; this is when the tubers can be dug up, stored and overwintered in a cool, dry place. In regions with mild winters, the tubers can sometimes be left in the ground to sprout again the following year. With the return of warm temperatures in late spring, the cycle can begin anew with either the replanting of stored tubers or the growth of the ones left in soil.

  • sproutPropogation

    • Propogation time

      Late winter - early spring

    • Propogation: The Dahlia 'Trengrove Millennium' is commonly propagated through division, a method best performed in late winter or early spring just before the new growth begins. This involves digging up the tuberous roots after the foliage has died back and the soil is dry. Gardeners should carefully divide the clump to ensure that each section has at least one eye, or growth point, from which new shoots can emerge. Divisions should be made with a sharp, sterile knife or spade to minimize damage and disease risk. The newly divided tubers can then be replanted immediately at a depth equivalent to their previous growing condition, generally about 6 to 8 inches (15 to 20 centimeters) deep, to encourage the development of a robust root system and new shoots. Properly spaced and cared for, these divisions will grow into healthy, blooming dahlias during the growing season.