Sale
Sold out
Perennial climbing plants
Ranunculaceae
Repeat-flowering double clematis for patios
Diamantina clematis
Clematis ‘Evipo039’
Diamantina™ is a bushy repeat-flowering clematis with double blooms measuring 10 to 15 cm across. More than 25 mauve, lavender and purple floral parts create a ruffled centre that slowly opens like a fountain. Each flower can remain attractive for up to approximately four weeks. The first display runs from late spring into midsummer, followed by another in early autumn. With a usual height of 150 to 180 cm, this climber suits patios, large containers, trellises and smaller gardens. A sheltered site, consistent moisture and light pruning support its dense manageable habit and help the layered flowers remain close enough for detailed viewing.
- Exposure
- Full sun to partial shade; sheltered, avoid a very dark north-facing site
- Hardiness
- Zone 4 to 9
Discover the plant
Common nameDiamantina clematis
FamilyRanunculaceae
GenusClematis
SpeciesGarden hybrids
CultivarEvipo039 (Diamantina)
TypePerennial climbing plants
Botanical nameClematis ‘Evipo039’
Diamantina™ Clematis (Clematis ‘Evipo039’) is a bushy repeat-flowering climber bred by Raymond Evison. Its double flowers measure 10 to 15 cm across and contain more than 25 floral parts in mauve shades touched with lavender and purple. A ruffled, fountain-like centre opens gradually, allowing each individual flower to remain attractive for up to approximately four weeks. The generous display begins in late spring and continues into midsummer, then returns in early autumn. Deciduous green foliage creates a dense background that emphasizes the layered form of every bloom and gives this refined cultivar a full appearance even between its flowering peaks.
Diamantina generally reaches 150 to 180 cm according to the breeder, although a well-established plant may approach 250 cm under favourable conditions. Its spread is approximately 50 to 100 cm. It suits patios, smaller gardens, large containers, trellises and wall-trained shrubs, especially plants with grey or variegated foliage. Choose full sun or partial shade in a sheltered position, avoiding a very dark north-facing site. Fertile, moisture-retentive yet well-drained soil supports steady growth. Set the crown 5 to 8 cm below the surface and keep the root zone cool with light mulch, flat stones or carefully placed low companion plants.
This clematis belongs to pruning Group 2. In late winter or early spring, remove dead or damaged stems, then reduce the remaining top growth by approximately one third to strong buds. Light pruning preserves older wood for the first flowering period while encouraging new shoots that carry the repeat display. Water deeply when the surface begins to dry, especially in containers, and apply compost or balanced fertilizer in spring. Clematis is toxic when eaten and its sap may irritate sensitive skin, so gloves are recommended during pruning. Tie new stems loosely to their support before they become tangled and inspect the crown regularly throughout active growth.
Planting guide
From planting to establishment.
Spacing / density
Approximately 60 to 90 cm (24 to 35 in) between crowns
Best planting time
Spring or early fall
Propagation
Semi-ripe cuttings or layering; commercial propagation may be restricted
Growing method
Plant Diamantina™ in full sun or partial shade in a sheltered position, avoiding a very dark north-facing site. Choose fertile, organic-rich soil that retains moisture while draining freely. Dig a hole wider than the root ball and set the crown 5 to 8 cm below the surface to encourage replacement stems. Install support before planting and position the crown away from a wall so rainfall can reach the roots. Water deeply after planting, then maintain consistent moisture without saturation. Light mulch or flat stones keep roots cool without covering the crown. Guide young stems with loose ties. In spring, add compost or balanced fertilizer. After the first flowering period, light feeding and steady moisture can support the early-autumn repeat. Inspect stems periodically for sudden wilt, slugs or aphids. Complete light Group 2 pruning in late winter or early spring, removing damaged growth and shortening remaining stems by approximately one third to strong buds. During flowering, avoid wetting the blooms unnecessarily and space stems so air can circulate. The large double flowers will remain better presented after rain. Remove only damaged material during active bloom, and keep the crown visible whenever mulch is renewed around the container or garden planting.
Soil and care
The right care,at the right time.
Soil pH
Acid to alkaline
Minimum temperature
-34 °C (-29 °F)
Care level
Intermediate
Watering
Water deeply and regularly during establishment so the root ball stays evenly moist without becoming saturated. In hot weather, check containers and plants growing beside walls more often because these sites dry quickly. Direct water toward the base instead of wetting foliage. Established clematis still perform best with consistent moisture and should not be treated as highly drought tolerant, especially while actively extending and flowering.
Soil type
Diamantina™ prefers fertile, organic-rich soil that remains moist yet drains well. Loam, clay, sand or chalk-based soil can be suitable when excess water escapes freely. Add mature compost before planting and avoid sites that remain waterlogged. Light mulch maintains moisture and cool conditions around the roots without directly covering the crown or restricting the emergence of new shoots. In containers, refresh the upper layer periodically with mature compost.
Fertilization
In spring, add mature compost or apply a balanced fertilizer according to label directions. A second light feeding after the first flush can support Diamantina™ repeat bloom. Avoid excessive nitrogen, which encourages foliage at the expense of flowers. Water before and after feeding, then stop fertilizing early enough for stems to mature before winter. In containers, use smaller applications when needed because nutrients leach more quickly with frequent watering.
Moisture
Moist soil without standing water
Seasonal care
In late winter or early spring, examine Diamantina™ from the base before cutting. First remove dead, broken or clearly weak stems. Then shorten the remaining top growth by approximately one third to a pair of strong buds. This light Group 2 pruning retains enough older wood for late-spring bloom while stimulating shoots that carry the repeat display. Tie new stems loosely and distribute them across the support. In spring, renew a thin layer of compost and begin regular watering as growth accelerates. During the first flowering period, remove only damaged material. After the midsummer wave, light feeding and stable moisture support early-autumn buds. Check containers daily during hot weather. In fall, collect diseased foliage and inspect ties. In cold climates, shelter pots from wind and repeated freeze-thaw cycles. Wear gloves during pruning because clematis sap may irritate sensitive skin. Keep the crown visible for quick inspection, and replace any mulch that has shifted against emerging stems after heavy rain. Protect emerging shoots from slugs and snails as growth begins. Monitor aphids and remove any stem that wilts suddenly. During flowering, direct water toward the base instead of the layered blooms. After heavy rain, allow flowers to drain without crushing their many floral parts. Keep support stable and leave enough room in ties for stems to thicken. When renewing mulch, preserve a clear ring around the crown so emerging shoots remain visible and air can move freely. Regular observation makes seasonal care easier and helps the repeat display develop evenly across the support.
Container growing
A garden,within reach.
Recommended pot size
At least 50 cm (20 in) deep and wide
Diamantina™ performs very well in a large container because of its bushy habit and usual height of 150 to 180 cm. Choose a frost-resistant pot at least 45 to 50 cm deep and wide with several drainage holes. Add a stable obelisk or trellis before filling the container. Use rich potting mix that retains moisture while allowing excess water to escape. Set the crown 5 to 8 cm below the surface, water thoroughly and keep the base lightly shaded. Distribute stems with loose ties so double flowers remain visible without crowding. Check moisture daily during hot periods because containers dry quickly. Feed moderately in spring and after the first wave. In late winter, remove dead growth and reduce the remainder by approximately one third. In cold climates, raise the pot, insulate its sides and shelter it from wind without moving the dormant plant into a heated room. Keep drainage openings clear throughout winter thaws. Rotate a movable container periodically for balanced light and inspect the support after strong winds. Remove damaged flowers or leaves, keep the crown visible when renewing mulch and leave enough space around the pot for convenient watering. A saucer should never retain water around the roots for long periods.
Bloom and dimensions
Its place,in your garden.
Mature height
Approximately 150 to 180 cm (5 to 6 ft); potentially to 250 cm when mature
Width / spread
Approximately 50 to 100 cm (20 to 39 in)
Flower color
Mauve shaded with lavender and purple
Foliage color
Vibrant green, deciduous
Foliage type
Deciduous
Growth rate
Moderate to fast
Growth habit
Climbing, bushy and dense
Fragrance
Slightly scented or without noticeable fragrance
Bloom period
Diamantina™ carries double flowers 10 to 15 cm across with more than 25 mauve, lavender and purple floral parts. Their ruffled centre gradually opens like a fountain, and each flower can remain attractive for up to approximately four weeks. The first flowering period begins in late spring and continues into midsummer. A repeat display appears in early autumn on fresh growth encouraged by steady moisture and suitable light pruning.
Fruiting
Achenes with decorative feathery styles late in the season
Garden associations
In goodcompany.
Companion plants
Pair Diamantina™ with wall-trained shrubs carrying grey or variegated foliage, creamy-white roses, coral bells or silver artemisias. These neutral tones highlight the mauve, lavender and purple flowers without competing with their very double structure. Low perennials can keep the soil cool, but preserve clear space around the crown for watering and pruning. Choose companions that enjoy fertile moist soil. Avoid overly vigorous plants or aggressive roots that could reduce available moisture and hide emerging clematis shoots in spring. Leave enough room to inspect and tie emerging stems safely.
Plants to avoid
Avoid highly invasive plants or aggressive roots immediately around the crowns
Frequently asked questions
Your questions,answered.
How should Diamantina clematis be pruned?
Diamantina™ belongs to pruning Group 2. In late winter or early spring, begin by visually tracing stems from the base. Remove dead, broken or weak wood. Then reduce the remaining top growth by approximately one third, cutting just above a pair of strong buds. This light pruning retains older wood for late-spring flowering while encouraging fresh shoots responsible for the repeat display. Use clean pruners, wear gloves and collect debris because clematis sap can irritate skin. Inspect the support, replace worn ties and distribute young stems before they become tangled. Avoid cutting every stem to ground level unless severe damage makes renovation necessary, because that would delay the earliest flowers.
Why do Diamantina clematis flowers last so long?
Each double Diamantina™ flower contains more than 25 floral parts arranged around a ruffled centre. This centre does not open all at once: it unfolds gradually like a fountain, so the bloom’s appearance changes over several weeks. Under suitable conditions, an individual flower can remain attractive for up to approximately four weeks. Consistent moisture, a sheltered position and good air circulation reduce stress and damage to the layered flower parts. Avoid severe gusts and prolonged dryness, especially in containers. Mauve, lavender and purple shades remain particularly easy to appreciate against a pale support or grey or variegated foliage near a patio, entrance or frequently used garden path.
Does Diamantina clematis suit containers?
Yes. Diamantina™ suits a large frost-resistant container at least 45 to 50 cm deep and wide. Choose a pot with several drainage holes and install a stable obelisk before planting. Use rich potting mix that holds moisture without remaining waterlogged, then set the crown 5 to 8 cm below the surface. Water until excess drains freely and check moisture daily during hot periods. Its usual height of 150 to 180 cm creates a strong vertical presence on a patio. In winter, raise the pot, insulate its sides and protect it from wind and standing water. Keep the dormant plant outdoors rather than moving it into a heated room.
What site suits Diamantina clematis?
Choose full sun or partial shade in a sheltered position. The breeder recommends avoiding a very dark north-facing site, while sufficient light supports both flowering periods. Soil should be fertile, organic-rich, moisture-retentive and well drained. Position the crown 30 to 60 cm away from a foundation so rainfall reaches the roots. Light mulch, flat stones or a low companion can keep soil cool without covering the crown. Install the trellis or obelisk before planting. Good air circulation helps foliage dry after rain, but avoid severe gusts that can damage the large double flowers. Leave easy access to the base for watering, feeding, inspection and annual light pruning.
Is Diamantina clematis toxic?
Yes. Like other clematis, Diamantina™ contains protoanemonin and is toxic when eaten. It may cause mouth irritation, drooling and digestive upset in dogs, cats, horses or people who chew the plant. Sap can also irritate sensitive skin. Position the container or support away from young children and animals that chew garden plants. Wear gloves during pruning, avoid touching your face and wash your hands after maintenance. Collect cut stems promptly and do not use them in food or decorative activities accessible to pets. If ingestion is suspected or symptoms appear, contact a veterinarian, poison-control service or medical professional for case-specific guidance rather than attempting a home remedy.
Wildlife and pets
Life,around your plants.
Reported toxicity
Yes
Supporting wildlife
The very double flowers of Diamantina™ may provide less accessible pollen than single clematis blooms. Insects may still visit, but this cultivar is selected mainly for ornamental value. To support more pollinators, add nearby single flowers rich in nectar that bloom during the same late-spring, summer and early-autumn periods.