Long Blooming Perennials

Dennis Morgeson

Agent For Horticulture

Washington County

What are perennials?

0 Plants that live for several years

0 Mostly herbaceous in nature

0 Multiply by seeds and increase in size of parent plant

0 Most grow from a crown, stolon's or rhizomes

0 Some live for a few years, some for decades

Perennials

Care issues:

Preparing the soil

Spacing

Planting and transplanting

Propagation

Watering, one inch per week

Fertilizing, 2-3 lbs. 5-10-10, two spring applications

Perennial Considerations

Design issues:

0 Height, placement in the bed or border

0 Color combinations

0Continuation of bloom!!!! 0 Foliage textures

Achillea filipendulina- Yarrow

0Many colors, flower in late spring to summer

02-3 feet tall and wide, dwarf varieties 8-15 inches

0Few pests

0Borders, cut flowers, dried

0Cuttings or division in spring or fall, some by seed

0Varieties-Coronation Gold, Gold Coin Dwarf, Goldie, Moonshine

0Trim back after bloom for rebloom

Achillea millifolium- yarrow 0 Wider range of colors

than previous species

0 Generally grows no more than 2 feet tall

0 Spreads faster, can become aggressive

0 Performs well in dry areas

0 Lots of varieties such as Paprika, Strawberry Seduction, Pomegranate, Summer Wine, etc.

0 Trim back after bloom for rebloom

Agastache (Hyssop) 0 Likes full sun and well

drained soils

0 Grows up to 3 feet wide and tall

0 Pinch early to keep them more compact but not required

0 Doesn’t do well in wet heavy clay but thrives in well drained soils

0 Pollinator and insect magnet

0 Blooms all summer

Agastache Varieties

Black Adder Blue Fortune Golden Jubilee

Kudos Gold Raspberry Summer

Aster spp. - Asters

0Flowers in blues, violets, whites in summer and fall

01-6 feet tall, taller varieties must be staked

0Powdery mildew is the major pest

0Used for borders and cut flowers

0Propagate by division in spring

Asters

Blue Autumn Little Carlow

Winston Churchill

Aster tataricus “Jindai”

Baltonia asteroides (False Aster)

0 Grows 3-5 feet tall and wide will need staking

0 Plant in full to part sun, tolerant of a variety of soils

0 This is an undemanding native loved by butterflies!

0 Blooms August until frost

Pink Beauty

Snowbank

Centranthus ruber- Jupiter’s beard

0 Vigorous perennial for well-drained soils

0 Tolerates poor soils if drainage is good

0 Dead head to extend bloom season

0 Red Valerian

Ceratostigma plumbaginoides – leadwort

Plant in full to part sun

Will tolerate some shade

but prefers full sun in

average soil

Generally late to emerge

but blooms from mid

summer until frost and

gives a nice fall color

Wiry semi woody

groundcover, grows 9-12

inches tall and 18 inches

wide

Chrysanthemum x superbum (Lucanthemum x superbum)– Shasta

Daisy 0White flowers in early spring

01-3 feet tall

0Major pest – aphids

0Used in borders, cut flowers

0Propagate by division in fall, seed

Shasta Daisy

Summer Ice Lacrosse (Compact Habit) Becky

Coreopsis -tickseed

0 Many species with varying plant habits

0 New colors and all bloom for an extended period, also varying foliage types

0 Dead head to extend bloom season

0 Best divided regularly to maintain vigor

Coreopsis

Cosmic Eye 12-20” Crème Brulee 8-12” Full Moon 18”

Coreopsis

Jethro Tull Red Satin Route 66 Sienna Sunset

Sweet Dreams

Zagreb Moonbeam

Dianthus - pinks

0 Many species and forms, many evergreen, prefers full sun and well drained soil

0 Most are easily grown

0 Range in height from 4”-3’

0 Many form spreading groundcovers

0 Attractive spiky silver foliage

0 Fragrant, rebloom after cut back and in fall

0 Attracts butterflies

Dianthus

Agatha Arctic Flame Bath’s Pink Pink Swirl

Desmond Horatio Helen

Greystone

Echinacea – Coneflower

0Varied flower colors but the purple and white still seem hardier 0Varying heights from 1-5 feet tall 0Major pest is powdery mildew 0Used as border or cut flowers 0Divide clumps in spring or by seed 0Deadhead for repeat bloom 0Yellow Finch will eat seeds if allowed to mature

Coneflower

Cheyenne Spirit Firebird Double Decker

Leilani

Pallida*

Paradoxa* Secret Pride Pink Poodle

Geranium sanguineum - Cranesbill Geranium

0Flowers in white, violet, red in late spring 01 - 1½ feet tall 0Few pests 0Used as a border or edge plant, protect from afternoon sun 0Propagate by seed, some by cutting 0Deer resistant, groundcover, attracts butterflies

Hardy Geranium

Ballerina Bevans Variety Biokova

Dark Reiter

Purple Who Samobor

Rozanne Wlassovianum

Eupatorium coelestinum – hardy ageratum

0 Very vigorous plant, particularly in moist soils

0 Cut back in summer to shorten and increase flowering

0 Divide regularly

Wayside

Eupatorium rugosum

0 Grows 3-5 feet tall and 3 feet wide

0 Mid summer to fall bloom

0 Full Sun to half sun

0 Normal soil even clay

0 Attracts butterflies, wet site tolerant as well

0 Purple green foliage also ads interest Chocolate

Eupatorium purpureum* – Joe pye weed

0 Stately perennial can grow to 10‘ Native plant attracts butterflies

0 Smaller dwarf versions are available

0 May reseed around the garden

0 Enjoys wet locations but will grow in average garden soil

Joe Pye Weed

Gateway 6’ Fistulosum* 3-4’ Little Joe 3-4’

Euphorbia - spurge

0 Many different forms, some evergreen

0 Very tolerant of poor dry soils

0 Milky sap may be an irritant to skin or eyes

0 Deer resistant and drought tolerant

0 Often self seeds Robbiae

Euphorbia

Bonfire Polychroma* Tiny Tim

Jade

Dragon Chameleon

Gaillardia x grandiflora – blanket flower

0 Very long bloom period in summer

0 Tends to be short lived

0 Excellent for dry areas

0 Often seeds itself in good soils

0 Deer resistant

0 Attracts butterflies

0 Drought Tolerant

Gaillardia

Bright Bicolour Yellow Peach Sun Flare

Red Sun Sun

Devil

Helenium autumnale- sneezeweed

0 Tall perennial valued for its fall blooms in yellow orange and red (newer shorter varieties)

0 Prune in summer or stake to support

0 Adaptable plant tolerates many soil types

0 Native

0 Can reseed

Sneezeweed

Mardi Gras

Moerheim

Beauty Autumnale*

Tiny Dancer

Red Jewel Carnival

Double Trouble

Heliopsis helianthoides

0Yellow flowers in summer and early fall

03-4 feet tall

0Few pests

0Used as a border or cut flower

0Propagate by seed or division

0Touch Plant!

Heliopsis helianthoides

Summer Nights Summer Sun Lemon Queen

Lorraine

Sunburst

Asahi

Hibiscus moscheutos – Hardy Hibiscus

White, red, pink and bicolors in summer, newer varieties bloom until late fall 3-8 feet tall, taller ones require staking Major pests are Japanese beetles and caterpillars Used as border plants Propagate by division or seed Prefers moisture but tolerates drought

Hardy Hibiscus

Fantasia Fireball Kopper King Lady Baltimore

Lord

Baltimore Plum Crazy

Hardy Hibiscus

Robert

Flemming

Sweet Caroline Moscheutos* Blue River II Heartthrob

Cherry

Cheesecake

Midnight

Marvel Summer Storm

Monarda - beebalm

0 Very vigorous plant is invasive in good soils

0 Loved by hummingbirds and butterflies

0 Tolerates moist areas

0 Powdery mildew is a huge problem prune hard to control or select mildew resistant varieties Jacob Cline

Beebalm Petite

Delight

Raspberry

Wine Claire Grace

Blue Stockings

Fireball Pardon My

Purple

Grand Mum

Oenothera fruiticosa

0 Rapidly spreading plant with yellow flowers in spring

0 Often short lived

0 Reddish stems

0 Tolerates dry soils

Fireworks

Other Oenothera

Summer Solstice

(tertragona)

Sunset

Boulevard

(versicolor)

Oenothera speciosa – showy primrose

0 Aggressive- leaning toward invasive

0 Large pink flowers over a long period in spring and summer

0 Cut back after bloom to encourage repeat

0 Deer Resistant

0 Groundcover

Siskiyou

Perovskia atriplicifolia - Russian Sage

0Blue flowers in summer

04-6 feet tall, shrubby

0Few pests

0Used as a border

0Propagate by cuttings, division, or seed

Little Spire

Filigran

Superba

Physostegia virginiana – obedient plant

0 Native plant in pink or white

0 Spreads aggressively in good soils

0 Tolerates moist areas

0 Good cut flower

0 Divide frequently

Miss Manners

Pink Manners

Vivid

Rudbeckia fulgida - Black-eyed Susan

0Yellow flowers in summer to fall

02-3 feet tall

0Powdery mildew is the main pest problem

0Used as a border, cut or meadow flower

0Propagation by division or seed

Goldstrum

Rudbeckia Fulgida Little Goldstar

lancinata* Autumn Sun

maxima*

Henry

Eilers

Salvia nemorosa – Garden Sage

0 Reliable plant with long bloom season in late spring

0 good for drier areas

0 Aromatic foliage

0 Cut back after bloom for a second, smaller flush of bloom

Blue Hill

Garden Sage

Caradonna

New Dimension

Blue Marcus May Night

Sensation

Deep Rose

Plumosa

Swan Lake

Sedum spp. - Stonecrop

0Yellow, orange, red flowers in summer but generally grown more for foliage

03-8 inches

0Few pests

0Used for edging, ground covers, rock gardens

0Propagation by division or seed

Sedum spectabile - Showy Sedum

0Pink, red, white, lilac flowers in late summer and early fall

012-18 inches tall

0Few pests

0Used as a border, edging, cut flower or dried

0Propagation by division or cuttings

0Drought tolerant Autumn Joy

Sedum Autumn Charm

Autumn

Fire Blade Runner Blue Spruce Brilliant

Carl Cherry Tart Dragons Tongue Munstead Red Murale

Sedum Neon Pool Party

Purple

Emperor

Red Cauli

T Rex Turkish

Delight

Mendoza

Begonia grandis - Hardy Begonia

0Pink flowers in summer

018-24 inches tall

0Few pests

0Used in borders

0Propagate by tubers (may not be hardy) or bulbils

0Full to part shade in protected sites only

Helleborus orientalis – Lenten Rose

0White or purple flowers in late winter and early spring

012-15 inches tall

0Few pests

0Used as a border plant

0Propagate by division or seed

0Shade!

Hellebores Amber Gem

Cotton

Candy Rose Queen

Sunshine Selections

Black Onyx Golden Lotus

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Questions?