Plantes d’extérieur
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Van Noort
Dahlia pinnata
‘Cactus Mix’ Dahlia (Dahlia × hortensis) combines four tubers producing large starry flowers with long, narrow, often recurved florets. Red, yellow, orange, pink, white, and bicoloured combinations may appear in this surprise selection, creating a vivid display as every plant gradually reveals its identity. Upright clumps generally reach 125 cm and carry graphic flowerheads above dense green foliage. From midsummer until the first frost, blooms renew generously. This Van Noort bonus pack is especially useful for quickly establishing a diverse flower bed or harvesting abundant textured cut flowers from one package, without selecting four separate cactus cultivars.
Plant the four tubers in spring after the final frost once the soil has warmed. Set them horizontally 10 cm deep with buds facing upward and leave about 50 cm between developing clumps. Choose a warm, sheltered position in full sun with fertile, humus-rich soil that stays moist yet drains thoroughly. Water deeply when the surface begins to dry without saturating the crowns. Add mature compost at planting, followed by potassium-rich fertilizer while buds form. Pinch young shoots, install stakes before stems lengthen, and remove faded flowers to maintain continuous production. Avoid excess nitrogen, which encourages leafy growth and can make tall stems softer and more vulnerable to wind.
Group ‘Cactus Mix’ in a large bed, toward the back of a border, or through a cutting garden where colour diversity can develop. Narrow florets complement the simpler forms of cosmos, salvias, verbenas, and grasses. Harvest flowers when fully open for starry bouquets; cutting also encourages replacement buds. One clump can grow in a very large stable container, although all four create a stronger effect together. In cold Canadian climates, lift the tubers after the first frost, let their surfaces dry, label them by colour if desired, and store them somewhere cool, dry, and frost-free. Inspect them monthly until planting time and retain only firm sections carrying viable buds.
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