Van Noort

Dahlia pinnata

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Advice adapted to Canada
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From bulb to bloom

Open-pollinated
Common nameCactus dahlia mix
FamilyAsteraceae
GenusDahlia
Bulb typeBulb
Botanical nameDahlia
Quantity per pack4 tubers

‘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.

Light and life cycle

In the garden

Exposure
Full sun
Life cycle
Perennial
Hardiness
Zone 10
Planting and establishment

Planting guide

Planting & establishment

Planting depth

10 to 12 cm (4 to 5 in.)

Planting period

May to early June in colder Canadian regions once the soil has warmed

Propagation

Division of tubers carrying at least one viable bud

Growing method

Plant all four tubers after frost, space them, pinch shoots, stake stems, and cut flowers regularly. Monthly inspection protects firm tissue until the next planting season. Potassium-rich nutrition accompanies buds without creating soft.
Soil and care

Soil and care

Soil & care

Soil pH

Slightly acidic to neutral

Minimum temperature

5 °C (41 °F)

Care level

Moderate

Watering

Water deeply at the base when the surface dries slightly, without wetting narrow florets or saturating the tubers.

Soil type

Choose fertile, humus-rich, moist, deep, well-drained soil to support four vigorous clumps.

Fertilization

Add mature compost, then potassium-rich fertilizer while numerous multicoloured buds develop. Supports installed early disappear into foliage and limit.

Seasonal care

In spring, plant, pinch, and support. In summer, water, feed, cut, and label. After frost, lift and store. Monthly inspection protects firm tissue until the next planting season.
Growing in containers

Container growing

Container growing

Recommended pot size

Large stable container, at least 45 to 50 cm (18 to 20 in.) per clump
Grow one clump per very large stable free-draining container; group all four in the garden to preserve the blend effect. Monthly inspection protects firm tissue until the next planting season.
Growth and flowering

Size, flowering & harvest

Mature height

90 to 120 cm (36 to 48 in.)

Width / spread

40 to 50 cm (16 to 20 in.)

Flower color

Mix of red, yellow, orange, pink, white, and bicoloured

Foliage color

Dark green

Foliage type

Deciduous

Growth rate

Fast

Bloom period

Multicoloured cactus flowers repeat from midsummer until frost when faded flowerheads are removed. Supports installed early disappear into foliage.

Harvest

July to October. Cut fully open flowers for the best vase life.
Garden companions

Garden associations

Companion plants & uses

Companion plants

Pair with cosmos, salvias, tall verbenas, and grasses to emphasize narrow florets and varied colours. Cutting fully open flowerheads supplies graphic bouquets.

Garden use

Group the four tubers in a sunny area where starry forms can mingle with simpler textures. Monthly inspection protects firm tissue until the next planting season. Potassium-rich nutrition accompanies buds without creating soft.

Frequently asked questions

Frequently asked questions

When should the cactus dahlia mix be planted?
Plant after the last frost, generally from May to early June in colder Canadian regions, once the soil is warm and drained.
How should the four tubers be spaced?
Set each tuber horizontally about 10 cm deep and keep 50 cm between developing clumps.
Which colours will I receive?
The package contains an assortment; exact colours appear only at flowering and can vary among the four plants.
Can the mix grow in containers?
Yes, one clump per very large stable container, although all four together express the blend more effectively.
How should the tubers be stored over winter?
After the first frost, lift the tubers, dry their surfaces, label colours, and keep them cool, dry, and frost-free.

Wildlife and pets

Wildlife & precautions

Supporting wildlife

Highly double flowers hide almost all of their disc and offer little accessible pollen or nectar. Their value is mainly ornamental. Support wildlife by pairing this dahlia with salvias, sweet alyssum, verbenas, and other simple flowers. Avoid insecticides, provide shallow clean water, and maintain several flowering periods in the border.

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