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Double Bubble Floral Harmony (Allium spp.)
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Ornamental flowering bulb
Amaryllidaceae
Van Noort
Common nameOrnamental allium
FamilyAmaryllidaceae
GenusGarlic
Bulb typeOrnamental flowering bulb
Botanical nameGarlic
Quantity per pack4 units
Double Bubble Floral Harmony (Allium spp.) combines four ornamental allium bulbs, with two producing white flowers and two producing soft lilac blooms. Their spherical umbels rise on slender stems reaching about 90 cm (35 in), creating an airy, architectural display in late spring. The contrast between clean white and gentle lilac adds rhythm and depth to garden compositions. Basal foliage supports spring growth before naturally declining after flowering. Highly cold-hardy, these alliums are well suited to Canadian and Quebec gardens and can return year after year when planted where excess moisture drains readily away from the bulbs.
Plant the bulbs in full sun and in light, loose, well-drained soil, as prolonged waterlogging can cause poor performance. Average garden soil with moderate fertility is generally sufficient, and additional fertilizer is seldom needed in rich ground. Plant from September through November, setting bulbs approximately 150 mm deep and spacing them 20 to 25 cm (8 to 10 in) apart. Water lightly after planting to settle the soil and support rooting, then provide additional moisture only during extended dry periods in spring. Once flowering ends, allow the foliage to yellow and dry naturally before removing it so the bulbs can replenish their stored energy for the following growing season.
This blend is especially effective in contemporary beds, grass gardens, sunny borders and naturalized plantings, where the upright stems appear to float above lower-growing perennials. The rounded flower heads can also be harvested for fresh arrangements and retained as decorative dried flowers. Planting the bulbs in small groups creates a stronger visual impact than scattering them individually. Allium flowers are visited by various pollinating insects while in bloom, adding ecological interest to ornamental plantings. Pair them with airy ornamental grasses and low to medium-height perennials that gradually conceal the ageing foliage without hiding the distinctive flower heads, creating a layered and long-lasting late-spring composition.
In the garden
- Exposure
- Sun
- Life cycle
- Bulbous perennial
- Hardiness
- Zones 3 to 8
Planting guide
Planting & establishment
Spacing / density
Spacing of 20 to 25 cm (8 to 10 in)
Planting period
September to November, before the ground freezes
Propagation
Bulbs
Growing method
Double Bubble Allium Collection (Allium spp.) brings together four ornamental allium bulbs: two white-flowered and two lilac-flowered. Their spherical umbels stand on long, slender stems approximately 90 cm (35 in) tall, creating a graphic and airy silhouette in late spring. The contrast between pure white and soft lilac adds rhythm and depth to plantings. Very hardy, these alliums are suitable for cold Quebec gardens and return year after year when the soil remains well-drained. Install the bulbs in sun, in light, loose, and especially well-drained soil, as stagnant moisture is not good for them. Ordinary, moderately enriched soil is sufficient; fertilization is rarely necessary in fertile soil. Plant from September to November, about 150 mm (6 in) deep and spacing the bulbs 20 to 25 cm (8 to 10 in) apart. Water lightly after planting to encourage rooting, then only intervene during prolonged dry periods in spring. After flowering, allow the foliage to yellow and dry completely before removing it so that the bulbs can replenish their reserves for the following season. This mix is particularly suited for contemporary beds, grass gardens, sunny borders, and naturalized plantings where its vertical stems seem to float above low perennials. Planted in small groups, the bulbs produce a more sustained effect than when isolated.
Soil and care
Soil & care
Soil pH
Neutral to slightly alkaline
Minimum temperature
Approximately -40 °C
Care level
Easy
Watering
Low to moderate; water lightly at planting and as needed during extended spring drought
Soil type
Light, loose and well-drained
Fertilization
Apply lightly in spring only if soil is poor; generally unnecessary in fertile soil
Seasonal care
In fall, plant the bulbs in well-drained soil before the ground freezes and water lightly to settle soil around developing roots. In spring, remove debris that could obstruct emerging shoots and irrigate only during prolonged dry periods. A light fertilizer application may be used if the soil is poor. After flowering, remove spent umbels if a tidy appearance is desired or leave them standing for architectural interest. Never remove foliage while it is still green; allow it to yellow and dry completely so the bulbs can store enough energy for the next season. During summer dormancy, greatly reduce watering because the bulbs perform best with relatively dry conditions.
Container growing
Container growing
Recommended pot size
Minimum 30 to 35 cm (12 to 14 in) deep
Container growing requires planning for the volume needed for the roots and the plant's final height. Choose a stable pot with drainage holes and a substrate suitable for planting. Leave enough space to respect the recommended depth and spacing, rather than crowding plants to fill the pot immediately. Place the container in the indicated exposure and regularly check the moisture level, especially in hot or windy weather. A pot is more exposed to temperature variations than a plant in the ground. Therefore, plan for a wintering location from the outset that is compatible with the plant's needs and your region's climate. Choose a sunny or slightly shaded location in well-draining soil. Prepare the soil before arranging the bulbs, then space them according to the packaging instructions to allow the plants to develop. Place the base of the bulb downwards and the tip upwards. Water after planting to bring the soil closer to the roots, then adjust watering based on the weather and soil moisture. Avoid depressions that remain soggy long after rain. A label at the edge of the group will help you find the bulbs when their foliage is no longer visible. In winter, protect the container according to the plant's needs: its roots are more exposed to cold than when planted in the ground.
Size, flowering & harvest
Mature height
90 cm (35 in)
Width / spread
20 cm (8 in) per bulb
Flower color
White and lilac
Foliage color
Green
Foliage type
Deciduous basal foliage, becoming dormant after flowering
Growth rate
Moderate
Bloom period
Late spring
Garden associations
Companion plants & uses
Companion plants
Ornamental grasses, hardy geraniums, catmints, salvias and low-growing perennials
Plants to avoid
Waterlogged soils and highly vigorous plants that heavily shade the bulbs
Garden use
Use Double Bubble in groups throughout sunny beds to create upright accents above lower-growing plants. Its white and lilac umbels fit especially well in contemporary gardens, ornamental grass plantings and naturalized schemes. Position the bulbs among perennials whose foliage will take over visually after the alliums bloom and gradually conceal their yellowing leaves. The stems may also be harvested for fresh flower arrangements or allowed to dry naturally in the garden, where the spent seed heads continue to provide architectural structure into early summer.
Frequently asked questions
Frequently asked questions
When should Double Bubble allium bulbs be planted?
Choose a sunny or slightly shaded location, in well-draining soil. Prepare the soil before arranging the bulbs, then space them according to the packaging instructions to allow the plants to develop. Place the base of the bulb downwards and the tip upwards. Water after planting to bring the soil closer to the roots, then adjust the watering according to the weather and soil moisture. Avoid depressions that remain waterlogged long after rain. A label at the edge of the group will help you find the bulbs when their foliage is no longer visible.
How deep should Double Bubble bulbs be planted?
The recommended exposure is full sun. Observe the light in your chosen spot in the morning and afternoon, as the shade from trees or buildings changes throughout the day. Also, consider neighboring plants: their foliage can obscure a young plant as it develops. For container plants, place the pot where you can move it if conditions become too hot or too shady. Suitable exposure must go hand in hand with proper soil and watering. If you move a plant started indoors to the outdoors, gradually accustom it to garden conditions to avoid too abrupt a transition for young leaves.
Can these alliums be grown in containers?
Water according to the actual soil moisture, taking into account rain, heat, and wind. Check below the surface before deciding on a new watering: soil that is dry on the surface may still be moist at root level. Direct the water to the base and allow it to penetrate, without keeping the plant in saturated soil. Containers generally require more frequent checks because they dry out faster. Make sure their drainage holes remain clear and empty any saucers that collect water. Also adapt care to the plant's cycle: active growth and a resting period do not require the same amount of water.
Should the foliage be cut back after flowering?
Container gardening 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 planting depth and spacing, rather than crowding plants to fill the pot immediately. Place the container in the indicated exposure and regularly check the moisture level, especially in hot or windy weather. A pot is more susceptible to temperature variations than a plant in the ground. Therefore, from the outset, plan for a wintering location compatible with the plant's needs and your region's climate.
Do Double Bubble flowers attract pollinators?
Keep the leaves as long as they remain green, even if they become less ornamental during flowering. They allow the bulbs to replenish their reserves. Lower neighboring plants can accompany their base without smothering them or requiring excessive watering during dormancy. You can remove faded flowers or keep the dry heads if you like their shape, taking into account the available space. Cut back the foliage only when it has yellowed naturally. These alliums are ornamental: do not use them as cooking onions and keep the bulbs out of reach of pets.
Wildlife and pets
Wildlife & precautions
Reported toxicity
Yes
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