Broader, brighter blades
The notably broad leaves carry strong waxy bloom, producing a pale blue mass rather than a fine grey line.
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Dianella 'Blue Stream'® 17cm
Normal price
€15,00
What does the legal guarantee mean for plants?
The legal guarantee concerns the plant’s conformity at delivery. It is not a guarantee of survival or growth for two years. Each issue is assessed taking into account the nature of the plant, its care and the conditions in which it is kept. Your statutory rights remain unaffected.
Dianella ‘Blue Stream’®
Heat, sun, drought — and it simply keeps looking good 🔥
- Broad pale-blue leaves
- Dense upright fan
- Sun to light partial shade
- Around 70 × 50cm
Dianella ‘Blue Stream’® brings a clear, luminous blue to the garden that ordinary evergreen foliage rarely achieves. Broad strap-like blades rise in vigorous fans and open gently outwards, creating a dense architectural mass without looking stiff. Repeated through a contemporary border, it establishes rhythm; used alone, it becomes a cool-coloured anchor that makes green, purple and silver planting appear richer and more deliberate.
Planted in a row beside a path, it creates a clear repeating rhythm; in a generous container, it becomes a complete architectural feature on its own. Its luminous blue visually cools stone, timber and dark-green foliage, while the broad blades add movement without losing their clean line. It is one of those plants that makes a space feel designed even without flowers.
What makes it special
Three defining traits of Blue Stream® explain why it stands apart from narrower-leaved or greener Dianella cultivars.
Vigorous upright fans
New fans arise from the base and overlap into a substantial clump with a clear vertical rhythm.
Colour built for heat
The waxy surface helps the foliage retain its cool appearance in bright, warm planting once the plant is established.
Why you will love it: it delivers real scale and cool blue colour with the permanence of evergreen foliage and the clarity of a designed object.
In the garden & on the balcony Placement & plant combinations Give it abundant light, free drainage and enough room for its broad fans to be seen in full.
A blue anchor in a warm garden
Use in full sun for the clearest blue, or bright partial shade in extremely hot reflected positions. It suits gravel planting, modern entrances, broad terrace pots and repeated drifts where its fans can be read individually.
Blue with burgundy, silver and violet
Combine it with shapes that remain lower or broader and share its need for free drainage.
- Tulbaghia violacea — fine violet flower stems add airy height and a warm contrast
- Loropetalum chinense ‘Black Pearl’ — broad burgundy foliage makes the blue bloom look brighter
- Helichrysum italicum — a low silver mound continues the cool palette at a finer scale
Care at a glance
Light
Full sun for the clearest blue or bright partial shade in fiercely hot reflected sites.
Watering
Water regularly until rooted, then deeply when the upper soil dries; avoid standing water.
Climate & hardiness
Handles heat and light frost to about −7°C, but needs protection from colder or prolonged freezes.
Safety
Possible berries are ornamental, not edible; keep them away from children and pets.
Detailed care Complete care guide Light, drainage, establishment, summer watering, container growing, feeding, grooming and winter protection
Light & orientation
In a mild coastal position it can take full sun. In a hot inland microclimate, a little afternoon shade can help, provided it still receives enough light to maintain its glaucous bloom.
Soil & drainage
Choose moderately fertile, well-aerated soil, from slightly acidic to neutral. Constant moisture around the base is far more dangerous than a brief dry spell.
Watering during establishment
During the first few months, water deeply when the surface begins to dry so that the whole root ball is moistened. Small daily doses do not encourage a deeper root system.
Watering once established
Once established, allow the top few centimetres to dry before watering again. Check more often during heatwaves and in containers, but never leave water standing in the saucer.
Growing in a container
Use a stable outdoor pot with clear drainage holes and an aerated growing mix. Move up in pot size gradually once the roots have filled the available space.
Feeding
One light application of a balanced slow-release fertiliser in spring is usually enough. Too much nitrogen softens the growth and blurs the cultivar’s clean outline.
Grooming the clump
Remove dry or damaged leaves individually from the base. Avoid cutting straight across the clump, which leaves every broad blade with an artificial flat top.
Winter protection
When severe frost is forecast, protect the roots and clump or move the pot to a bright, sheltered position. Keep the growing mix only just moist through winter.
Development over time From a basal fan to a broad glaucous clump The roots establish, side rosettes multiply, and the cultivar gradually develops its full mature spread.
Rooting in
The 30cm plant first secures its rhizomatous base and may show limited top growth.
Fan multiplication
New basal fans broaden the outline and strengthen the pale-blue vertical rhythm.
Mature clump
Over time the overlapping fans build an upright clump around 70 × 50cm.
Mature habit & dimensions
Mature plantHeight about 70cmSpread about 50cmBroad upright fans
Broad, wax-coated blades rise in overlapping fans from a compact rhizomatous base and arch only near their tips.
Form through time
Two realistic statesYoung basal fansPossible warm-season flowers
Foliage-led formFresh fans thicken the base while the pale-blue blades remain the main display.
Warm-season possibilityAn established plant may lift a loose branched flower stem above the foliage, without losing its leaf-led structure.
Flowering varies with age and climate; the cultivar should be chosen for its foliage rather than a guaranteed floral display.
What to expect after planting: Establishment comes first. Over time the fans multiply and the clump approaches about 70cm in height and 50cm in spread; whether flowers are present on arrival depends on the plant’s age and the climate.
History & origin Cultivar origin A controlled Australian cross and the journey of ‘Proquest D5’
Graham Brown created Blue Stream® in New South Wales. In 2007 at West Pennant Hills he made a controlled cross between two selected Dianella breeding lines. A seedling with broader, strongly glaucous blades and vigorous upright growth was selected at Macquarie Fields in 2009 and named ‘Proquest D5’.
Repeated propagation confirmed its stable colour, leaf width and habit. It reached the Australian market in February 2012 and later European gardens. The same selection may appear as a hybrid within Dianella, be grouped with D. caerulea, or be sold under D. revoluta; these are different botanical placements for ‘Proquest D5’, not different plants.
Greenleaf for Plant Nerds Science nobody asked for Botanical details for anyone who wants to know what lies behind the plant’s appearance
Blue is heavy glaucous bloom
A strong wax layer scatters light above the green tissue, making the blade read as pale blue.
A strap with micro-armour
The slightly concave blade ends in a small point and carries weak marginal and midrib teeth, plus a coloured basal sheath.
Why its botanical name varies
The same ‘Proquest D5’ selection has been described as a hybrid within Dianella, grouped with D. caerulea, and sold under D. revoluta. These are different botanical placements, not different plants.
Frequently asked questions
Six practical answers about identity, mature size, sun, watering, flowering and winter protection.
01Is the foliage genuinely blue?
The tissue is green beneath a strong wax bloom that scatters light and produces the characteristic pale-blue appearance.
02How large does it become?
An established clump is expected to reach roughly 70cm high and 50cm wide.
03Will it flower?
It can produce loose blue flowers in a warm climate, but flowering is variable and not guaranteed.
04Can it grow in a pot?
Yes. Choose a broad, free-draining outdoor pot and divide or move it on when basal fans become crowded.
05How drought tolerant is it?
Once rooted it tolerates dry spells, but better foliage comes from a deep drink when the upper root zone dries.
06How should winter damage be handled?
Wait until frost risk eases, then remove only damaged blades at the base and preserve the healthy fans.
📦 Your plant travels protected
Every order is prepared with care so your plant arrives upright, secure and safe.
Individual protection
Plants in pots with a capacity of 3 litres or more are placed in individual boxes that hold the pot securely and reduce the risk of tipping over.
Sturdy packaging
We use reinforced cardboard designed to protect against impacts and vibration during transport.