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Bulb
Asteraceae
Dahlia cactus ‘Rainbow Silence’ (Dahlia)
Dahlia × pinnata
Dahlia Rainbow Silence forms an upright, bushy clump, 90 cm (35 in.) high by 50 cm (20 in.) wide. Its sturdy stems bear numerous double flowers in salmon-red, pink, and orange around a yellow center, held above dark green, toothed foliage; some buds also show purplish hues. The No1 Van Noort tuber flowers from mid-summer until the first frost. Grow it in full sun in fertile, humus-rich, well-drained soil, with early staking, deep watering at the base, and moderate potassium-rich feeding. This selection is suitable for beds, large containers, and cutting gardens. Frequent removal of spent flowers encourages new buds and maintains an attractive display.
- Quantity
- 1 tuber
- Exposure
- Sun
- Life cycle
- Hardy perennial
- Hardiness
- Zone 10
Discover the plant
Common nameDahlia
FamilyAsteraceae
GenusDahlia
TypeBulb
Botanical nameDahlia × pinnata
Reproducible seedsYes
Dahlia cactus ‘Rainbow Silence’ (Dahlia) forms a bushy, upright clump, growing to about 90 cm (35 in) in height and 50 cm (20 in) in spread, according to Van Noort's specifications. Its double flowers combine salmon red, pink, and orange around a yellow center, with purple hues possibly appearing on the buds. The toothed dark green foliage and sturdy stems showcase an abundant bloom from mid-summer until the first frost. Each package contains one No. 1 tuber. This vigorous selection is suitable for sunny beds, large stable containers, and cut flower gardens looking for a warm, shifting, and easy-to-pair color palette.
Plant the tuber in spring, after the last frost, when the soil has warmed and dried out. Lay it 10 cm (4 in) deep, bud side up, in fertile, humus-rich, moist, and freely draining soil. Allow about 50 cm (20 in) around the crown and install a sturdy support before the stems lengthen. Water sparingly before sprouting, then deeply at the base when the surface begins to dry. Pinch the young shoot when it is 20 to 30 cm (12 in) tall to encourage multiple branches. Incorporate mature compost before planting and then use a moderate fertilizer, richer in potassium as soon as buds form. Avoid standing water, excess nitrogen, and repeated watering on the flower heads.
Place Rainbow Silence in the center of a border where its salmon, pink, orange, and yellow flowers can interact with blue salvias, lime zinnias, chocolate cosmos, and soft grasses. Harvest the stems when the flowers are almost open and regularly remove faded flower heads to prolong flowering. The very double flowers offer little access to pollen; add nearby single flowers for beneficial insects. Monitor for slugs, aphids, earwigs, and spider mites, and maintain generous air circulation. In Quebec, after the first frost, lift the tuber, let its surface dry, label it, and store it in a cool, dark, dry, and frost-free place until the following spring.
Planting guide
Plant well.Grow beautifully.
Planting depth
10 cm (4 in)
Best planting time
Spring, when the ground is warm
Propagation
Division of tubers, each bearing a viable bud
Growing method
After the last frost, loosen a warm, sunny area to a depth of about 30 cm (12 in), then incorporate mature compost. Place the tuber horizontally 10 cm (4 in) deep, bud facing up, and allow 50 cm (20 in) around the future crown. Cover without compacting. Water very little before emergence, unless the soil becomes truly dry. When the shoot reaches 20 to 30 cm (8 to 12 in), pinch it above a pair of leaves to encourage multiple branches. Immediately install a sturdy stake, then tie the stems with flexible ties as they lengthen. During growth, water deeply at the base when the surface dries and fertilize moderately, prioritizing potassium as soon as buds appear. Harvest flowers when almost open or remove faded flower heads to stimulate replacement. After the first frost, cut the stems, carefully lift the tuber, let its surface dry, and store it in a cool, dry, dark, frost-free place until spring. During warm periods, add a light organic mulch without covering the crown. Check ties after each storm and loosen them before they mark the stems. Avoid pesticides on flower heads and keep a few simple flowers nearby for beneficial insects.
Soil and care
The right care,at the right time.
Soil pH
Slightly acidic to neutral
Minimum temperature
5 °C (41 °F)
Care level
Moderate
Watering
Water regularly to keep the soil evenly moist without overwatering. Reduce watering before autumn tuber lifting. Water sparingly before emergence, then deeply at the base when the surface begins to dry. Avoid standing water, excess nitrogen, and repeated watering of flower heads. In Quebec, after the first frost, lift the tuber, let its surface dry, label it, and store it in a cool, dry, dark, and frost-free place until the following spring.
Soil type
Opt for a humus-rich soil that retains moisture while allowing excess water to drain. Check drainage after rain: water should be able to exit the root zone. Work the soil when it's dried out to avoid compaction. Adapt amendments to its actual texture. For container plants, use appropriate potting soil and a pot with drainage holes. Keep these openings clear and avoid any water accumulation in the saucer.
Fertilization
Incorporate mature compost before planting to improve soil structure and nutrient content. Once shoots are established, use a balanced fertilizer at a low dose, then switch to a formula richer in potassium when buds appear. Repeat according to package directions, but do not fertilize dry soil. Avoid excess nitrogen, which produces a lot of foliage and more tender stems at the expense of flowers.
Seasonal care
In spring, check the firmness of the stored tuber, remove only actively rotted tissue, and wait until all risk of frost has passed. Loosen the soil, incorporate compost, plant 10 cm (4 in) deep, and install support immediately. Water sparingly before emergence. When the shoot reaches 20 to 30 cm (8 to 12 in), pinch it above a pair of leaves to encourage multiple branches. In summer, tie the stems with soft ties, water deeply at the base when the surface dries, and fertilize moderately with more potassium at bud formation. Remove faded flower heads or harvest nearly open flowers early in the morning. Watch for slugs, aphids, earwigs, spider mites, and signs of foliar disease. Maintain generous air circulation and avoid wetting the foliage in the evening. After storms, check ties and straighten branches before they break. In autumn, let the first frost blacken the foliage, then cut the stems, carefully lift the tuber, and let its surface dry. Label 'Rainbow Silence' and store it in a cool, dark, dry, frost-free place. Inspect it monthly until the next planting. During heatwaves, add a light mulch without covering the crown and increase the frequency of moisture checks. Promptly remove any diseased foliage, disinfect tools between plants, and do not compost heavily affected tissue. Always keep a legible label with the cultivar.
Container growing
A garden,within reach.
Recommended pot size
Capacity 40-50 L, deep and very stable
Container growing requires planning for the necessary root volume and the plant's final height. Choose a stable pot with drainage holes and a suitable planting medium. Leave enough space to respect the recommended depth and spacing, rather than crowding plants to immediately fill the pot. Place the container in the indicated exposure and regularly check the moisture, especially in hot or windy weather. A pot is more exposed to temperature variations than planting in the ground. Therefore, plan for a wintering location compatible with the plant's needs and your region's climate from the outset. Plant in spring once all risk of frost has passed and the soil has warmed sufficiently. Choose a sunny spot, sheltered from strong winds, in fertile, well-drained soil. Arrange the tuberous roots with their crown and buds facing upwards, without breaking the fragile attachments. Install a stake at planting time if support will be needed, to avoid damaging the roots later. Water sparingly at the start, then adjust watering based on foliage growth. Constantly waterlogged soil around the tubers should be avoided, especially before the first shoots appear. Plan to bring the storage organs indoors away from frost for the Quebec winter.
Bloom and dimensions
Its place,in your garden.
Mature height
100 cm (40 in)
Width / spread
40 cm (16 in.)
Flower color
Salmon, rose and orange around a yellow center; buds sometimes purple
Foliage color
Green
Foliage type
Null and void
Growth rate
Quick
Bloom period
The cactus-type flowers feature long, tapered petals in shades of pink, peach, and yellow, creating a luminous, star-like effect. Its double flowers combine salmon red, pink, and orange around a yellow center, while purple hues may appear on the buds. The serrated dark green foliage and sturdy stems highlight abundant blooms from mid-summer until the first frost. Place Rainbow Silence at the center of a border where its salmon, pink, orange, and yellow flowers can interact with blue salvias, lime zinnias, chocolate cosmos, and graceful grasses.
Harvest
July to October. Pick the flowers when fully open to get the best vase life.
Garden associations
In goodcompany.
Companion plants
Pairs perfectly with ornamental grasses, Verbena bonariensis, cosmos, and salvias to create spectacular beds. Its double flowers combine salmon-red, pink, and orange around a yellow center, while purple hues may appear on the buds. This vigorous selection is suitable for sunny beds, large stable containers, and cutting gardens seeking a warm, changing, and easy-to-combine palette. The very double flowers offer little access to pollen; add nearby single flowers for beneficial insects.
Frequently asked questions
Your questions,answered.
When to plant the Rainbow Silence dahlia?
Plant the tuber after the last frost, generally from May to early June in Quebec, when the soil has warmed up and is well-drained. Lay it horizontally 10 cm (4 in) deep, bud facing up, in fertile, humus-rich, and freely draining soil. Allow approximately 50 cm (20 in) around the crown and immediately install a support. In a cold region, you can start it in a pot four to six weeks earlier, then gradually acclimatize the sprout before planting it out. Water very sparingly before emergence to prevent rot, then increase the water supply as the roots and stems become active. Choose full sun to support strong stems and abundant flowering.
What height does Rainbow Silence reach?
Rainbow Silence can produce flowerheads that reach a large size when the plant receives full sun, fertile soil, deep watering, and balanced nutrition. To concentrate energy into one flower, keep the terminal bud of a stem and gently remove the side buds. Install a sturdy stake before growth begins and loosely tie the stem. This technique reduces the total number of flowers; therefore, allow several other stems to branch normally if you also want to harvest bouquets throughout the season. Protect large flowerheads from strong winds and prolonged rains. Check each tie after summer thunderstorms.
What colors are its flowers?
Install a sturdy stake at planting to avoid damaging the roots later. Tie the stems with soft ties as they grow. Pinch back the young shoot to 20-30 cm (8-12 in) to encourage branching. Water deeply at the base when the surface is dry, then allow excess water to drain. Incorporate mature compost at the start and then use a moderate fertilizer, richer in potassium once buds form. Avoid excess nitrogen, which produces tender stems and a lot of foliage. Regularly remove faded flowers so that energy is directed to the next buds until frost.
Can Rainbow Silence be grown in a pot?
Yes. Choose a stable container of 40 to 50 L, deep, well-drained, and filled with rich but aerated potting mix. Plant a single tuber 10 cm (4 in) deep and insert the support before the roots develop. Place the pot in full sun, protected from gusts of wind. Water sparingly before sprouting, then abundantly when the top layer dries, without leaving water in the saucer. Apply a moderate liquid fertilizer, richer in potassium once buds appear. Turn the container weekly, pinch the young shoots, and remove spent flowers to maintain a balanced shape. Before frost, lift the tuber or move the pot indoors for frost-free storage.
How to overwinter the tuber in Canada?
After the first frost that blackens the foliage, cut back the stems, leaving a short stub. Lift the tuber with a fork, working far enough away so as not to damage it. Gently remove excess soil, let the surface dry in a ventilated area, and clearly label it Rainbow Silence. Store it in the dark, in a cool, dry, and frost-free place, in a slightly insulating material that limits desiccation without retaining water. Inspect it monthly. Remove only parts showing active rot and increase ventilation if condensation appears. Wait for the last spring frost and warmed soil before replanting.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Very double flowers hide the disk and offer little accessible pollen. Near Rainbow Silence, add alyssum, sage, verbena, or single cosmos to support bees, hoverflies, and butterflies throughout the season. Avoid pesticides on the flowerheads and maintain a small source of clean water nearby.
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