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  • Home
  • About, Services, Contact
  • Ask Amanda
  • Roses
    • Types of Roses
    • Easy Roses
    • Climbing Roses
    • Portland's Rose Test Garden
    • Rose Insects & Diseases
    • Pruning Roses
    • Rose Sawfly
    • Rose Bloom Balling
  • Pruning Basics 101
    • Pruning Tools
    • Winter Pruning
    • Pruning Grapes
    • Pruning Clematis
    • Prune Your Own Garden Registration
  • Lawn Basics
    • Lawn Reno, Seed & Sod
    • Lawn Maintenance Schedule
    • Spring Lawn Care
    • Moss in Lawns
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  • Mulch & Mulching
    • Living Mulches - Groundcovers
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    • Taking Cuttings
    • Seed & Plant Catalogues
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    • Sheet Mulching, Lasagna Gardening
    • Cover Crops
    • Composting
    • Compost Tea
    • Houseplant Winter Care
    • Hummingbirds in Winter
    • Winterize Your Garden
    • Ponds in Winter
  • Growing Food
    • Spring Veggie Gardening
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    • Harvesting
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    • Winter Veggie Gardening
    • Taming Tomatoes
    • Speeding up Tomato Harvest
    • Tomato Tips
    • Saving Tomato Seeds
    • Tomato Troubles
  • Plant Pests 1
    • Plant Pests Part 2 - Controlling Insects
    • Garden Inspections
    • Helping Pollinators
    • Dogwood Anthracnose
    • Viburnum Leaf Beetle
    • Dormant Oil/Lime Sulfur
    • Japanese Beetles
    • Peony Blotch/Measles
    • Slugs & Snails
    • Horsetail, the Weed
    • June Beetle
    • Powdery Mildew
    • Soil Solarization
    • Rhododendron Leaf Spot
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    • American Sweetgum
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    • Autumn Crocus
    • Bear's Breeches
    • Beautyberry, Callicarpa
    • Black-eyed Susans
    • Bleeding Heart, Lamprocapnos spectabilis
    • Calla Lilies
    • Dahlias
    • Daylily
    • Delphiniums
    • Devil's Walking Stick, Aralia spinosa
    • Dwarf Alberta Spruce
    • Dwarf Burning Bush
    • Evergreen Clematis
    • Fall Asters
    • Flowering Currants
    • Flowering Quince
    • Fritillaria
    • Garden Peonies
    • Garden Phlox
    • Ginkgo biloba
    • Grape-hyacinths
    • Handkerchief or Dove Tree
    • Harry Lauder's Walking Stick
    • Heathers
    • Hellebores, Lenten roses
    • Himalayan Sweet Box
    • Jack-in-the-pulpit, Cobra Lily
    • Japanese Anemones
    • Japanese Forest Grass
    • Japanese Maples
    • Japanese Skimmia
    • Japanese Spurge
    • Laurustinus viburnum
    • Lavenders
    • Lily-of-the-Valley Shrub, Pieris japonica
    • Mediterranean Spurge
    • Mexican Mock Orange
    • Montana Clematis
    • Mountain Ash
    • Oriental Poppies
    • Oriental Lilies
    • Paperbark Maple
    • Pink Dawn Bodnant Viburnum
    • Poinsettias
    • Oregon Grape Holly
    • Ornamental Kale
    • Peruvian Lily, Alstroemeria
    • Phalaenopsis, Moth Orchids
    • Persian Silk Tree
    • Portuguese Laurel
    • Rose of Sharon
    • Sneezeweed, Helenium
    • Snowberry
    • Snowdrops
    • Star Magnolia
    • Strawberry Tree, Pacific Madrone
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    • Torch Lily, Kniphofia uvaria
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Delphiniums
July's Plant of the Month 2022

Elegant, beautiful, blue & Fussy

Blue Lace New Millennium Delphinium larkspur
Blue Lace New Millennium Delphinium.
blue flowers,summer flowers
The white 'bee' of a Pacific Giant delphinium.
swallowtail,butterfly plants,delphiniums and butterflies
Butterflies love their sweet nectar.
Excalibur Pink delphinium,
Excalibur Pink is a cultivar with sturdy stems to support the densely packed flower spikes.
Delphinium,larkspur,summer flowers,blue flowers,cut flower garden
Delphiniums are an old-fashioned cottage garden favorite.
Picture
Blue Lace New Millennium Delphinium blossoms are light blue with a pink tint.
pink delphiniums,larkspur
A single blossom of the Excalibur Pink delphinium.
Picture
Pacific Giants are so tall, they often need gentle staking.
Picture
Allow some seeds to mature on the plant so they will self-seed.
Picture
Flowering lasts for months, starting in late spring and well into fall.
​Common Name:  delphinium, perennial larskspur
Botanical Name:  Delphinium
Form:    upright, narrow, columnar
Family:  Ranunculaceae (buttercup family)
Genus:  Delphinium
Species:  300 species
Plant Type: herbaceous deciduous perennial
Mature Size:  depends on type, generally 5 to 6ft tall and 2ft wide
Growth: fast
Origin:  Northern hemisphere, mountain regions of Africa
Hardiness Zone: 3 to 8
Foliage:  3 to 7 deeply pointed lobes per leaf palmately arranged, toothed margins, green leaves cluster at the bottom of the plant
Flowers: Borne on erect stems from 10 cm (3.9”) to meters (6’.62”) depending on species, raceme inflorescences (flower clusters), five sepals form a tube with a nectar rich spur at its base. Four small true petals lie inside the flower (referred to as a ‘bee’), which may or may not be the same colour of the sepals. Flowers are usually deep blue, but there’s also pink, red, yellow or white species, hybrids and varieties. Blossoms June, July and August.
Fruit:  silique pod with many small black seeds
Stems:  non woody, tall, herbaceous and will bend with the weight of the flowers
Exposure:  full sun for 6 to 8 hours, shelter from wind
Soil:  must be well-drained
Uses:  pollinator garden for bees and butterflies, garden borders, cut flowers, hummingbirds
Propagation:   seeds, cuttings, root divisions
Pruning:  cut off flower spikes after flowering, cut off faded foliage in fall and discard
​Problems:  All parts are toxic to animals and humans when ingested. Aphids, crown rot, slugs, botrytis grey mold, mildew, leaf miners

Comments: Delphiniums are one of my favorite perennials.  Their narrow elegant profile, fern-like foliage, and spires of blue flowers are difficult to resist. In the garden, they provide a much-needed vertical accent for round, weeping, horizontal and vase shaped plants.
 
Persnickety plants: I wish delphiniums weren’t so finicky. Growing them in the Pacific Northwest is a bit tricky due to all the rain. Combine that with clay soil and plants inevitably rot. Delphiniums must have good drainage as they are prone to many types of diseases, especially crown and root rot. I’ve lost quite a few myself due to crown rot. To prevent diseases, plant them where there’s good air circulation and don’t overcrowd.
 
Garden location: Plant delphiniums in sunny location where they’ll receive 6 to 8 hours of sun per day. Morning sun is best, so morning dew quickly evaporates. Shelter from strong winds to prevent their flower stalks from flopping over. It’s best to keep them staked from the get-go. When stems bend, cut them back by one half so new growth will develop at the base. Place any flower spikes in a vase as delphiniums are excellent cut flowers.
 
Deadheading & Seeding: To ensure new generations and longevity, allow some seeds to develop. Delphinium’s seeds are viable and will grow into new plants, but don’t worry, they are not invasive. It is important to deadhead them after flowering so they don’t waste energy producing seeds, however, leave a few faded flower stalks so they will self-seed and will germinate the following spring.
 
Types of delphiniums: There are many varieties of delphiniums. The tallest varieties are found within the Delphinium elatum group, with stalks typically 5 to 6 feet tall with a spread of 2 feet. The majority of garden delphinium hybrids and cultivars are derived from the elatum species. The D. belladonna group averages 3 to 4 feet tall with a spread of 2 feet. Dwarf varieties, like D. grandiflorum, range 1 to 2-feet tall and 12 to 18 inches wide.
 
Annual delphiniums (Delphinium, Consolida) are commonly referred to as larkspurs. They resemble perennial delphiniums, but they do not regrow in spring. There are numerous types available with a wide range of colours. Purchase plants from plant nurseries in spring or grow them from seed.
 
Planting: Plant potted delphiniums in the spring. Improve existing soils by mixing in a couple of inches of compost, SeaSoil or composted manure. When planting, dig a hole in the amended soil at the same depth of the rootball and twice as wide. The crown, where the stems and roots meet, should be level with the soil.
 
Toxicity: All types of delphiniums, and their parts, are poisonous to animals and humans if ingested. Touching the plant can cause skin irritation with some people so it’s a good idea to wear gloves when handling them, including the annual species. FYI delphiniums are used in asthma medications.  
Picture
Can you spot the bee inside the delphinium's 'bee'?
Picture
At base  of each flower is a nectar-filled spur.
Delphiniums must have full sun and soil that drains well.
delphinium seeds,silique pod
Delphinium are self-sowing when conditions are right, but are not considered to be invasive
Picture
Their attractive lacy foliage is deeply lobed.
Picture
At base of each flower is a nectar-filled spur.

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  • Home
  • About, Services, Contact
  • Ask Amanda
  • Roses
    • Types of Roses
    • Easy Roses
    • Climbing Roses
    • Portland's Rose Test Garden
    • Rose Insects & Diseases
    • Pruning Roses
    • Rose Sawfly
    • Rose Bloom Balling
  • Pruning Basics 101
    • Pruning Tools
    • Winter Pruning
    • Pruning Grapes
    • Pruning Clematis
    • Prune Your Own Garden Registration
  • Lawn Basics
    • Lawn Reno, Seed & Sod
    • Lawn Maintenance Schedule
    • Spring Lawn Care
    • Moss in Lawns
    • Lawn Alternatives
    • Lawn Grub Control
  • Mulch & Mulching
    • Living Mulches - Groundcovers
  • Propagation
    • Growing Seeds Outdoors
    • Growing Seeds Indoors
    • Taking Cuttings
    • Seed & Plant Catalogues
  • How to Garden Topics
    • Fall Garden Chores
    • Planting Know-How
    • Soil Building
    • Watering Tips & Techniques
    • Drought Gardening
    • Sheet Mulching, Lasagna Gardening
    • Cover Crops
    • Composting
    • Compost Tea
    • Houseplant Winter Care
    • Hummingbirds in Winter
    • Winterize Your Garden
    • Ponds in Winter
  • Growing Food
    • Spring Veggie Gardening
    • Crop Rotation, Succession & Companion Planting
    • Harvesting
    • Growing Potatoes
    • Winter Veggie Gardening
    • Taming Tomatoes
    • Speeding up Tomato Harvest
    • Tomato Tips
    • Saving Tomato Seeds
    • Tomato Troubles
  • Plant Pests 1
    • Plant Pests Part 2 - Controlling Insects
    • Garden Inspections
    • Helping Pollinators
    • Dogwood Anthracnose
    • Viburnum Leaf Beetle
    • Dormant Oil/Lime Sulfur
    • Japanese Beetles
    • Peony Blotch/Measles
    • Slugs & Snails
    • Horsetail, the Weed
    • June Beetle
    • Powdery Mildew
    • Soil Solarization
    • Rhododendron Leaf Spot
    • Plant Rusts
    • Black Knot
  • Container Growing
    • Choosing a Container
  • Feeding Plants 101
    • Fertilizers & Ratios
    • Nutritional Deficiencies & Toxicities
    • Organic Plant Food
  • Plant of the Month
    • Spring Flowering Bulbs
    • Colourful Fall Plants
    • Abelia
    • American Sweetgum
    • Ash (Fraxinus) Trees
    • Astilbes
    • Aubretia, Rock Cress
    • Aucuba, Japanese Spotted Laurel
    • Autumn Crocus
    • Bear's Breeches
    • Beautyberry, Callicarpa
    • Black-eyed Susans
    • Bleeding Heart, Lamprocapnos spectabilis
    • Calla Lilies
    • Dahlias
    • Daylily
    • Delphiniums
    • Devil's Walking Stick, Aralia spinosa
    • Dwarf Alberta Spruce
    • Dwarf Burning Bush
    • Evergreen Clematis
    • Fall Asters
    • Flowering Currants
    • Flowering Quince
    • Fritillaria
    • Garden Peonies
    • Garden Phlox
    • Ginkgo biloba
    • Grape-hyacinths
    • Handkerchief or Dove Tree
    • Harry Lauder's Walking Stick
    • Heathers
    • Hellebores, Lenten roses
    • Himalayan Sweet Box
    • Jack-in-the-pulpit, Cobra Lily
    • Japanese Anemones
    • Japanese Forest Grass
    • Japanese Maples
    • Japanese Skimmia
    • Japanese Spurge
    • Laurustinus viburnum
    • Lavenders
    • Lily-of-the-Valley Shrub, Pieris japonica
    • Mediterranean Spurge
    • Mexican Mock Orange
    • Montana Clematis
    • Mountain Ash
    • Oriental Poppies
    • Oriental Lilies
    • Paperbark Maple
    • Pink Dawn Bodnant Viburnum
    • Poinsettias
    • Oregon Grape Holly
    • Ornamental Kale
    • Peruvian Lily, Alstroemeria
    • Phalaenopsis, Moth Orchids
    • Persian Silk Tree
    • Portuguese Laurel
    • Rose of Sharon
    • Sneezeweed, Helenium
    • Snowberry
    • Snowdrops
    • Star Magnolia
    • Strawberry Tree, Pacific Madrone
    • Stewartia
    • Torch Lily, Kniphofia uvaria
    • Tree Peonies
    • Tuberous Begonias
    • Virginia Creeper
    • Weigela
    • Winterhazel, Corylopsis
    • Winter Camellia, C. sasanqua
    • Wintergreen, Gaultheria procumbens
    • Witch Hazel
    • Wood Anemones
    • Yews
  • Garden Tour Blogs
  • Monthly Flower Arrangements
  • Website Index
  • Subscribe
  • Need Help?
  • Garden Club Events