Dahlia 'Trelyn Rhiannon' Dahlia 'Trelyn Rhiannon' (C)

Water

Dahlias require a consistent watering schedule, especially during the growing season. Water dahlias deeply once or twice a week, providing a total of about 1 to 2 inches of water per week, which amounts to approximately 0.5 to 1 gallon for each plant. Ensure the soil is moist but not waterlogged, as too much water can cause the tubers to rot. During periods of high heat and dryness, you may need to water more frequently. Always water at the base of the plant to keep the foliage dry and reduce the risk of fungal diseases.

Light

Dahlias thrive in a location where they receive full sun for at least 6 to 8 hours a day. The best spot for a dahlia is in an area with direct exposure to sunlight, away from large trees or buildings that could cast shade. They require plenty of light to develop strong stems and vibrant blooms, so a south or west-facing garden bed is ideal.

Temperature

Dahlias grow best in temperatures ranging from 60 to 70 degrees Fahrenheit, but they can tolerate a wider range from 50 to 90 degrees Fahrenheit. It's important to protect these plants from frost, as they are sensitive to cold temperatures and their growth can be stunted if exposed to freezes. An ideal temperature for the dahlia to flourish is a consistent daytime temperature in their optimal range with slightly cooler nighttime temperatures to promote vigorous growth.

Pruning

Pruning dahlias, also known as deadheading, encourages the plants to produce more flowers and can help maintain a compact growth habit. Remove spent flowers to promote continuous blooming and cut back stems by about one-third when they reach about 1 foot in height to encourage bushiness. Pruning is typically done throughout the blooming season, which for dahlias is from midsummer until the first frost. The best time to prune is in the morning when the plant is well hydrated.

Cleaning

As needed

Soil

Dahlias prefer well-draining, fertile soil with a pH between 6.5 and 7.0. A mix of loamy soil, peat moss, and sand is ideal, ensuring ample drainage and nutrient retention. Regularly supplement with a balanced fertilizer according to the growing season requirements.

Repotting

Dahlias, commonly known as 'Dahlia', do not require frequent repotting. They are typically replanted annually from their tubers that are stored over winter. Check tubers for rot or damage before repotting in the spring.

Humidity & Misting

Dahlias thrive in moderate humidity conditions. They do not need high humidity; average room humidity is generally sufficient. Avoid placing them in excessively dry or humid conditions to prevent stress and potential growth issues.

Suitable locations

• Indoor

  Place Dahlias in bright, indirect light and rotate occasionally.

• Outdoor

  Plant in sunny spot, protect from strong winds, water regularly.

• Hardiness zone

  8-11 USDA

Life cycle

Dahlias, including the 'Trelyn Rhiannon', typically start their life as tubers planted in the spring once the risk of frost has passed. They begin to sprout and develop foliage, and as the soil temperature increases, they enter a rapid vegetative growth phase. Flower buds form during the summer months, and the plant will start to bloom, showcasing its vibrant colors and patterns. Following the flowering stage, dahlias will continue to produce new blooms until the first frost in autumn. After blooming, the foliage begins to yellow, and the plant enters dormancy; at this point, tubers can be dug up, stored for winter, and then replanted the following spring. This cycle repeats annually, with each tuber capable of giving rise to a new plant that will go through the same stages of growth and reproduction.

Propogation

• Propogation time

  Spring-Early Summer

• The most popular method for propagating Dahlia 'Trelyn Rhiannon' is through division, since these plants grow from tuberous roots. This is typically done in the spring, just before new growth begins, when the tubers have been stored over winter and are free of frost. To propagate by division, a clump of dahlia tubers is carefully separated into smaller sections, making sure that each section has at least one 'eye' or growth point. Cuttings should be made with a clean, sharp knife to minimize damage. After the division, the tuber pieces should be allowed to dry for a day before planting them in well-draining soil, which helps to prevent rot. Plant the tubers with the eyes facing upwards, and cover with about 2 inches (approximately 5 centimeters) of soil. Water the newly planted tubers well to encourage the growth of new dahlia plants.