Dahlia Mount Tacoma
Dahlia Mount Tacoma
Dahlia Mount Tacoma
Cactus dahlia
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Description
Dahlia 'Mount Tacoma' is a pure white dahlia with large "cactus" flowers bristling with pointed petals. It charms with its graphic form and luminosity, both in borders and in vases. The plant is vigorous and flowers for over four months, right into autumn. A top-class variety for wedding cut flower arrangements!
Dahlia is a genus belonging to the Asteraceae family, native to the mountains of Mexico and Central America, now cultivated as a tuberous plant for summer flowering. The 'Mount Tacoma' variety is cultivated from tubers; it is a non-hardy perennial plant in our climate. It is classified in the "Cactus and Semi‑cactus" group, characterised by flowers with long, narrow petals that are more or less recurved and/or tubular. Its flower measures 15 to 18 cm in diameter. Its height varies from 1 m to 1.20 m depending on growing conditions. Flowering spreads from July to October. The foliage is green, the stems are sturdy and capable of supporting the flowers. At the end of the season, the vegetation turns black; this is the time to overwinter the tubers in a dry, frost-free place.
If you take care to deadhead spent flowers, you will benefit from a prolonged flowering period. Create large cut flower arrangements by combining various dahlia varieties with diverse forms and colours. The large, bristly white flowers of Dahlia 'Mount Tacoma' pair well with the decorative foliage of the Oriental Ostrich Fern and eucalyptus. To accentuate its whiteness, choose, for example, Coneflower ‘Green Twister’ or Ammi majus ‘Queen of Africa’.
A star plant for borders and cottage gardens, Dahlias confidently accompany the most beautiful flowers, but are also appreciated alongside vegetable plants. In Mexico, this tuberous plant was first cultivated as a root vegetable for consumption. However, its poor culinary qualities assigned it to the rank of ornamental plant, much to the delight of gardeners.
Plant habit
Flowering
Foliage
Botanical data
Dahlia
Mount Tacoma
Asteraceae
Cactus dahlia
Cultivar or hybrid
Planting and care
Dahlia 'Mount Tacoma' is easy to grow in all regions. For generous flowering, it is good to follow a few simple rules: plant the tubercles in full sun after the last frosts; rich, cool, and well-drained soils are perfect. However, stagnant moisture would encourage tubercle rot. Do not hesitate to amend the soil with compost and sand if needed. Work the soil deeply and enrich it, for example, with ground horn or dried blood. Place your tubercle and crumble the soil well to fill in without air pockets. Your dahlia should be covered with about 6 cm of soil. At the end of planting, water thoroughly once and then repeat this watering regularly for the first 6 weeks to aid rooting.
Dahlias are sensitive to cold and need to be overwintered. In November, the first frosts blacken the foliage; this is the time to lift them. Dig up the tubercles carefully. Remove as much soil as possible. Let the foliage dry so the tubercles can replenish their reserves. Then cut the stems to 10 cm. Spread your bulbs in a crate on newspaper. Store them frost-free in a dry, cool, and dark place, such as a frost-free garage or an attic. In southern regions, near the coast, experiencing only a few frosty days per year, it is possible to leave them in place. In this case, simply cover the soil with a carpet of leaves or straw as protection.
Tall Dahlias, with hollow stems, do not withstand wind or heavy rain well. To overcome this drawback, you can stake them, but, you must agree, it is not very aesthetic. On the other hand, by pinching the stems early or removing the axial flower buds, you will spread the habit of the plant, which will offer more resistance to bad weather. At the same time, you thus channel the influx of sap onto a single flower, which will become larger and stronger.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:
- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.