Name: ‘Topmix Purple’ Dahlia
Brand: Van Noort
SKU: VAN-327-417-32
Price: 9.99 CAD
Availability: InStock

Sale Sold out

Compact Topmix Purple dahlia clump bearing numerous brown-purple single flowers with golden central discs above branching green foliage

Bulb Asteraceae

Dahlia nain à fleurs simples pourpres

Van Noort

Dahlia pinnata

From bulb to bloom

Common nameTopmix Purple dahlia

FamilyAsteraceae

GenusDahlia

CultivarTopmix Purple

Bulb typeTubercule

Botanical nameDahlia

Quantity per pack1 tubercule

Bulb sizeNo 1

‘Topmix Purple’ Dahlia (Dahlia × hortensis) forms a compact, upright clump approximately 50 cm tall and 50 cm wide. Numerous brown-purple single flowers surround well-exposed golden-yellow central discs. Bright flowerheads stand out against green foliage and branching stems, bringing a sunny presence without hiding neighbouring plants. Van Noort’s No. 1 tuber flowers through summer and continues producing until the first frost when faded blooms are removed. Its Mignon format suits edging, small borders, patios, and containers, while the open centres remain readily accessible to bees, hoverflies, and butterflies. Repeated bloom makes the plant useful wherever a low, luminous seasonal accent is needed.

Plant the tuber after the final frost once soil has warmed, in a sheltered position receiving full sun. Lay it 10 cm deep with the bud facing upward in fertile, humus-rich, moist, freely drained soil. Leave 50 cm around the crown. Water sparingly before emergence, then deeply at soil level whenever the surface dries. Pinch the young shoot at approximately 20 cm to encourage dense branching. Incorporate mature compost before planting and apply moderate fertilizer afterward, shifting toward higher potassium as buds appear. Avoid excessive nitrogen, standing water, and repeated irrigation over foliage. Maintain open airflow through humid summer weather and keep the growing area free of competing weeds.

Place Topmix Purple at the front of a border or in a stable container near a seating area to enjoy its luminous single flowers. Pair it with blue salvias, violet verbenas, white sweet alyssum, purple calibrachoas, and fine grasses to strengthen contrast. Open centres provide direct access to pollen and nectar, so avoid pesticides on flowerheads. Remove faded blooms regularly, watch for slugs, aphids, and spider mites, and maintain generous airflow. In Canada, after the first frost, lift the tuber, let its surface dry, label it, and store it in darkness somewhere cool, dry, and frost-free until spring. Inspect stored material monthly and discard only actively rotting tissue.

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 cm

Spacing / density

Environ 50 cm entre les plants.

Establishment temperature

Sol à environ 16 °C ou plus

Rooting time

Quelques semaines, selon la chaleur et les conditions de culture

Planting period

Printemps, après les derniers gels

Propagation

Division of tubers, each retaining a viable bud

Growing method

Plantez après les derniers gels au soleil, dans un sol fertile et drainé. Arrosez régulièrement pendant la croissance et retirez les fleurs fanées. À l’automne, déterrez la souche avant que le sol gèle et conservez-la au frais, hors gel.

Soil and care

Soil & care

Soil pH

Slightly acidic to neutral

Moisture

Sol frais pendant la croissance, bien drainé et sans eau stagnante.

Minimum temperature

5 °C (41 °F)

Care level

Easy

Watering

Régulier pendant la croissance, sans eau stagnante.

Soil type

Fertile, humifère et bien drainé

Fertilization

Incorporate mature compost before planting. During early growth, use balanced fertilizer low to moderate in nitrogen, then favour higher potassium when buds appear. Follow the labelled rate and water afterward. Excess nitrogen encourages foliage at the expense of flowers.

Seasonal care

In spring, inspect the tuber and plant it after the final frost once soil has warmed. Water sparingly until emergence. In early summer, pinch the shoot at approximately 20 cm to form a branching clump, then maintain even moisture without saturation. As buds appear, feed moderately with a formula richer in potassium. During flowering, water deeply at soil level in dry weather, remove faded heads continuously, and watch for slugs, aphids, and spider mites. Maintain open airflow around the foliage. After the first frost blackens the leaves, cut the stems, lift the tuber carefully, and allow its surface to dry in a ventilated place. Label Topmix Purple, then store it in darkness somewhere cool, dry, and frost-free. Inspect it monthly and remove only tissue showing active rot. In colder Canadian regions, store the tuber somewhere cool, dry, and frost-free through winter. Generous airflow helps the foliage dry quickly after rain.

Growing in containers

Container growing

Recommended pot size

12 to 15 L, at least 30 cm in diameter

Choose a stable 12 to 15 L container that is deep and fitted with several drainage holes. Fill it with a rich yet airy growing mix, then plant one tuber 10 cm deep. Keep the pot in full sun with shelter from strong gusts. Water sparingly before emergence, then thoroughly whenever the upper few centimetres of mix dry; always empty the saucer. Pinch the young shoot to encourage branching and apply moderate liquid feeding richer in potassium from bud formation. Rotate the container weekly to maintain balanced growth. Remove faded flowers to extend bloom. Before frost, move the pot under cover or lift the tuber for storage somewhere cool, dry, and frost-free. In colder Canadian regions, store the tuber somewhere cool, dry, and frost-free through winter. Generous airflow helps the foliage dry quickly after rain.

Growth and flowering

Size, flowering & harvest

Mature height

Environ 50 cm

Width / spread

Environ 50 cm

Flower color

Brownish purple with purple tips and an orange-yellow centre

Foliage color

Green

Foliage type

Deciduous

Growth rate

Fast

Growth habit

Compact et buissonnant

Bloom period

Flowering generally begins in midsummer and continues until the first frost. Pinch the young shoot to encourage branching, remove faded blooms regularly, and harvest stems when flowerheads are fully open. Full sun and moderate feeding support a sustained display.

Harvest

June to October. Cut fully open flowers for small bouquets, or let them fade naturally before removing them.

Garden companions

Garden associations

Companion plants & uses

Companion plants

Pair Topmix Purple with blue salvias, violet verbenas, white sweet alyssum, gauras, catmint, and compact grasses. These plants strengthen the purple display without hiding its low habit and extend resources for pollinators. Avoid very dense neighbours or plants that require constantly saturated soil.

Other recommended plants

Alysse blanc, sauge bleue et verveine de soleil.

Garden use

Place Topmix Purple at the front of a border or beside a path where its single flowers remain easy to appreciate. Repeat two or three plants with 50 cm between crowns to create a purple rhythm without restricting airflow. Pair it with blue salvias, violet verbenas, white sweet alyssum, or fine grasses. In a small courtyard, grow one tuber in a stable container and rotate the pot weekly for balanced growth. Remove faded blooms to renew buds, while leaving several fresh flowerheads open for bees and butterflies. Keep the base accessible in autumn because the tuber must be lifted and stored frost-free in colder Canadian regions. In colder Canadian regions, store the tuber somewhere cool, dry, and frost-free through winter. Generous airflow helps the foliage dry quickly after rain.

Frequently asked questions

When should Topmix Purple dahlia be planted?

Plant the tuber after the final frost once soil has warmed and no longer stays waterlogged. Choose full sun and fertile, humus-rich, freely drained ground. Lay the tuber horizontally 10 cm deep with the bud facing upward, leaving 50 cm around the crown. Water very sparingly before emergence to reduce the risk of rot. Once stems are established, water deeply at soil level whenever the surface dries. In a cold region, you can start the tuber in a container several weeks earlier, then gradually acclimatize the shoot before setting it outdoors.

Do Topmix Purple flowers attract pollinators?

Yes. Unlike highly double dahlias, Topmix Purple bears single flowers with an open central disc. Bees, hoverflies, and butterflies can therefore reach pollen and nectar directly while flowerheads are fresh. Place the plant in sun and avoid spraying pesticides on the blooms. Leave several flowerheads open during the day, then remove them after fading to encourage new buds. Combine sweet alyssum, salvias, verbenas, or other single flowers to provide complementary resources before and after the dahlia’s main flowering periods.

How can Topmix Purple flowering be extended?

Pinch the young shoot at approximately 20 cm to encourage several branches and more buds. Water deeply at soil level whenever the surface dries, then allow excess moisture to drain. Incorporate mature compost before planting and use moderate fertilizer richer in potassium once buds form. Avoid excessive nitrogen, which produces abundant foliage at the expense of flowers. Remove faded flowerheads regularly before seeds develop. In a very exposed position, shelter the clump from strong winds so the flowering stems do not lean or break.

Can Topmix Purple grow in a container?

Yes. Choose a stable 12 to 15 L container that is deep and fitted with several drainage holes. Fill it with a rich yet airy growing mix, then plant one tuber 10 cm deep. Set the pot in full sun with shelter from strong gusts. Water sparingly before emergence, then thoroughly whenever the upper few centimetres of mix dry, without leaving water in the saucer. Apply moderate liquid feeding richer in potassium from bud formation. Rotate the container weekly and remove faded blooms to maintain balanced growth and a steady display.

How should Topmix Purple be overwintered in colder Canadian regions?

After the first frost blackens foliage, cut the stems while leaving a short section. Lift the tuber with a fork, working far enough from the crown to avoid injury. Gently remove excess soil, allow the surface to dry in a ventilated place, and label Topmix Purple clearly. Store the tuber in darkness somewhere cool, dry, and frost-free, using a lightly insulating material that limits shrivelling without holding water. Inspect it monthly and remove only sections showing active rot. Plant it again after the final frost once soil has warmed.

Wildlife and pets

Wildlife & precautions

Reported toxicity

Yes

Supporting wildlife

Single flowers with open discs give bees, hoverflies, and butterflies direct access to pollen and nectar. Avoid pesticides on flowerheads and add other single flowers to extend seasonal resources.