Colour Wheel - Plant Use and Flower Shape Gallery

Site Map

Introduction explains the 54 links to the 54 colour pages in the Colour Wheel links map below and the tabular Colour Wheel at the top of the middle table in that page.

Dark Tone
or Shades (Colours mixed with Black) is the outer circle of colours.

Mid-Tone
(Colours mixed with Grey) is the next circle of colours.

Pure Hue
(the Primary, Secondary or Tertiary Colour named) is the next circle of colours.

Pastel
(Colours mixed with White) is the innermost circle of colours.

These 12 colour spokes of Dark Tone, Mid-Tone, Pure Hue and Pastel are split into:-

Plant Bloom
Dec-Jan
Feb-Mar

Plant Bloom
Apr-May
Jun-Aug

Plant Bloom
Sep-Oct
Nov-Dec

There are other pages on Plants which bloom in each month of the year in this website:-

• 12 Bloom Colours per Month Index
• Plants Blue, Orange, Red, Yellow, White, Other Colours which lead on to other pages
• Colour Wheel - All Flowers per Month 12

• Bedding
• Bulb
• Climber
• Deciduous Shrub
• Deciduous Tree
• Evergreen Perennial
• Evergreen Shrub
• Evergreen Tree
• Herbaceous Perennial
• Rhododendron
• Rock Garden and Alpine Flower Colour Wheel
  Rock Plant Flowers 53
• Rose
• Wild Flower

When you have reached the required Flower Colour Page, then click on Flowering Months of the required plant to compare this flower with others
from the same Plant Type - Bulbs, Climbers, Evergreen perennials - in that month
OR
with others from the plants at RHS Wisley in that month

Plant Selection by Flower Colour

Blue Flowers

Bedding.
Bulb.
Climber.
Evergr Per.
Evergr Shrub.
Wild Flower.
 

Orange Flowers

Bedding.
Wild Flower.

Other Colour Flowers

Bedding.
Bulb.
Climber.
Evergr Per.
Evergr Shrub.
Wild Flower.

Red Flowers

Bedding.
Bulb.
Climber.
Decid Shrub.
Evergr Per.
Evergr Shrub.
Herbac Per.
Rose.
Wild Flower.

White Flowers

Bedding.
Bulb.
Climber.
Decid Shrub.
Decid Tree.
Evergr Per.
Evergr Shrub.
Herbac Per.
Rose.
Wild Flower.
 

Yellow Flowers

Bedding.
Bulb.
Climber.
Decid Shrub.
Evergr Per.
Evergr Shrub.
Herbac Per.
Rose.
Wild Flower.
 

Site design and content copyright ©September 2019. Amending Table Layout and adding Plant data, December 2022. Chris Garnons-Williams.

DISCLAIMER: Links to external sites are provided as a courtesy to visitors. Ivydene Horticultural Services are not responsible for the breakage of the link to the Safety Regulations for man walking with Red Flag before Automobile.  

If you are looking for specialist nurseries or garden centres in the UK our plant finder comes complete with an easy to use A-Z list of garden plants that makes finding plants for sale online easy. To help with plant identification we include many photographs and individual plant descriptions.

Once you have found the plant you are looking for we provide easy access to growers and nurseries who have these species for sale, many with mail order or 'online' buying facilities

The Complete Book of Container Gardening . Consultant Editor: Alan Toogood. Authors: Peter McHoy, Tom Miles , Roy Cheek. Published 1991. ISBN 0-7472-0415-2.

The plants for the containers are split into the following Planting Plans:-

• Alpines and Miniatures within Plant Use in Patio Pot Page
• Attracting Wildlife within Plant Use is Attracting Birds and Attracting Butterflies Pages
• Containers for All Seasons within Plant Use in Patio Pot Page
• Containers for Scent within Plant Use in Patio Pot Page
• Country Containers within Plant Use in Patio Pot Page
• Fruit in Containers within Plant Use in Patio Pot Page
• Functional Containers within Plant Use in Patio Pot Page
• Summer Baskets within Plant Use in Patio Pot Page
• Summer Boxes and Troughs within Plant Use in Patio Pot Page
• Summer Pots, Tubs and Urns within Plant Use in Patio Pot Page
• The Exotic Look within Plant Use in Patio Pot Page
• The Oriental Influence within Plant Use in Patio Pot Page
• Vegetables and Herbs within Use as Potted Veg Outdoors Page
• Water Displays within Plant Use in Patio Pot Page
• Winter and Spring Displays within Plant Use in Patio Pot Page

For the Characteristics, Position, Compost and Special Maintenance of the following plants, consult the book.

Botanical
Plant Name for suitable plant for container growing outside

Common Name

Deciduous
(Herbaceous)/ Evergreen/ Semi-evergreen
Plant Type

Flower Colour and Flowering
Season
or
used primarily for its Foliage or Fruit rather than its flowers

Height x Width in inches (cms) -
1 inch = 2.5 cms,
12 inches = 1 foot,
36 inches = 3 feet = 1 yard,
40 inches = 100 cms

Foliage Colour

Full Sun,

0.25 shade-0.75 sun,

0.5 shade - 0.5 sun.

0.25 sun - 0.75 shade,

Full Shade

Zone

Needs winter protection

Plant Use

Other kinds to try

Daphne odora 'Aureo-marginata'
(Daphne japonica 'Striata' 
Daphne odora 'Marginata')

Gold-edged winter Daphne

Evergreen Shrub

Rounded clusters of white flowers flushed purplish pink dot the bush and give off a delightful perfume in the cold and dreary days of winter and early spring.

24 (60)

Rounded bush with irregular outline. Light green glossy elliptical leves with a thin cream margin. A pleasant shrub at all times of the year.

Full Sun to
0.25 Sun - 0.75 Shade

7

Worth a place in a windowbox or trough for the winter scent alone. Gives height and background to small winter-flowering bulbs, such as crocus - especially Crocus chrysanthus 'Blue Pearl', irises and snowdrops.

Resents transplanting.

• Daphne x burkwoodii 'Somerset', 24 (60), semi-evergreen, with smaller lance-shaped leaves and more branching habit than the daphne odora 'aueo-marginata'. Delightfully scented, light pink flowers in late spring. It looks good with lily-flowered tulips, such as ruby-purple 'Captain Fryatt', Zone 7.5;
• Daphne mezereum, deciduous upright shrub, 18 (45), purple flowers in late winter to early spring. Looks good in a windowbox or trough springing from a drift of Crocus chrysanthus 'Snowbunting', with ivy trailing over the edge, Zone 5.

Datura 'Grand Marnier'
(Brugmansia 'Grand Marnier',
Brugmansia aurea 'Grand Marnier', 
Brugmansia versicolor 'Grand Marnier', Brugmansia versicolor 'Versicolor Grand Marnier', Datura versicolor 'Grand Marnier',
Brugmansia x candida 'Grand Marnier')

Angel's Trumpet 'Grand Marnier'

Tender Evergreen Tree

Huge trumpet-like flowers hang from the top shoots in late spring through till mid autumn. They are about 8 (20) long and 7 (18) across, a most delicate peach colour for all the world like a lady's silk swirling dress. The scent is marvellous and is even greater in the evenings.

84 (210)

Stout vertical stems have soft green oval pointed leaves about 8 (20) long.

Full Sun to
0.25 Sun - 0.75 Shade

10

One plant in a tub or large urn is a sensation worthy of a sheltered patio or poolside.

Brugmansia Growers International is the International Cultivar Registration Authority for Brugmansia and Datura

• Datura suaveolens, similar but with white flowers;
• Datura cornigera (Datura arborea), white double flowers;
• Datura sangunea, slimmer yellow tube with scarlet-orange trumpet, slightly tougher, Zone 9.

Daucus carota 'Favourite'

Carrot

Vegetable

No flowers

12 (30)

The upright but slightly spreading leaf stems of carrots carry hundreds of leaflets, as fine as any fern and a most pleasant green. The root develops gradually, swelling and becoming orange-red, but this is not visible above ground. In this kind the roots are short so that it can be grownin containers with a depth of only 6 (15)

Full Sun to
0.5 shade - 0.5 sun

5

Pick fresh for salads or for ooking. As a growing plant the foliage is a fine edging for the broad colourful leaves of Swiss chard, or indeed many other vegetables.

Wild carrot is attractive to a wide variety of specialized pollen and nectar feeding insects such as bees, hoverflies and beetles.

• 'Nantes', similar to above, stump-rooted about 6 (15) long;
• 'Parmex', globe-shaped and about 3 (7.5) long, ideal fr shallow containers.

Dianthus nanus giganteus
(Dianthus chinensis
'SnowFire')

Indian Pink

Annual

The flowers are borne at the top of the shoots in open clusters in summer. Each one is about 1 (2.5) wide, with serrated petals; 'Snow Fire' is white with a brilliant scarlet eye.

8 (20)

Slender blue-green stems give rise to pairs of narroe grass-like blue-green leaves.

Full Sun to
0.5 shade - 0.5 sun

7

For achieving a cottage garden effect this plant is a must. It looks like the old-fashioned Sweet William and, as a fine-leaved rounded plant, it contrasts perfectly with the towering hollyhock (Althaea rosea). Add to these blue love-in-a-mist (Nigella) and silver-leaved helichrysum flowing over the edge of a wooden half barrel for perfection.

• 'Strawberry Parfait', 6 (15), pink flowers with a strawberry eye;
• 'Rspberry Parfait', 6 (15), white stripes on deep crimson;
• 'Priness Purple', 8 (20), violet-purple. The Princess strain is also available in crimson, scarlet, salmon, white and mixed;
• Dianthus barbatus 'Giant Auricula Eyed', 18 (45), the true and very scented Sweet William, scarlet, crimson and pink forms all with white-eyed or white-edged flowers;
• Dianthus alpinus, a perennial, 8 (20), low tufted blue-green grassy foliage supports slim stems each topped with a few light pink or rose-coloured flowers.
• Old-fashioned pinks are compact, grey-leaved perennials:
  • 'Brympton Red', single, bright crimson with good scent;
  • 'Dad's Favourite', semi-double white with chocolate lacing, heavily scented.
• Modern pinks are longer flowering:
  • 'Denis', double magenta flowers;
  • 'Doris', pale pink with a red base.

Diascia cordata

Twinspur

See Diascia cordata Plant Description Page for photos and further details.

Prostrate Perennial

The vertical stems bear spike-like clusters of five-lobed flowers from mid summer to early autumn. The flowers are unique; pink, with a big lip, a yellow dusting inside and a spur at the back.

6 (15)

Horizontal stems clothed with tiny pale green heart-shaped leaves form a basal carpet from which vertical stems arise.

Full Sun to
0.5 shade - 0.5 sun

8

Perfect for a windbox or urn because the carpet of dainty foliage will trail over the edge and the striking flowers are best seen close up. It contrasts well with Osteospermum.

• Diascia vigilis, 12 (30), pale green rounded toothed leaves, upright branches with loose spikes of pale pink flowers;
• Diascia 'Ruby Field', 3 (8), wiry stems with pale green heart-shaped leaves, wide-lipped salmon-pink flowers on short spikes.

Dionysia tapetodes

Evergreen prostrate Perennial Alpine

In early spring cup-shaped flowers, each with five petals, gild the green cushion with gold.

0.5 (12mm)

A tight mat of tiny green leaf rosettes.

Full Sun to
Full Shade

6

A windowbox or sink where it can be seen properly is best to display the beauty of this miniscule plant. It should be associated with other alpines and low-growing plants that will not overpower it. Sempervivum tectorum (houseleek) with its succulent rusty red rosettes is a good companion.

• Dionysia aretioides, 3 (7.5), similar to this plant but greyish green leaves and scented flowers.

Eccremocarpus scaber

Chilean Glory Flower

Evergreen Climber grown as an Annual

84 (210)

Full Sun to
0.25 Sun - 0.75 Shade

8

Echeveria gibbiflora 'Rosea'

Rose Echeveria

Woody Succulent with an erct rosette

20 (50)

Full Sun to
0.25 shade - 0.75 sun

9.5

Eranthis hyemalis
(Eranthis cilicicus)

Winter Aconite

Tuberous Herbaceous plant

3 (7.5)

Full Sun to
Full Shade

7

Erica carnea 'Springwood Pink'
(Erica
herbacea)

Alpine Heath

Spreading woody Evergreen

6 (15)

Full Sun to
0.5 shade - 0.5 sun

5

Erigeron mucronatus
(Erigeron karvinskianus)

Lax spreading Perennial

4 (10)

Full Sun to
0.5 shade - 0.5 sun

7.5

Eucalyptus perriniana

Spinning Gum

Evergreen Tree

192 (480)

Full Sun to
0.5 shade - 0.5 sun

7

Euonymus fortunei 'Emerald 'n' Gold'

Everreen Shrub

20 (50)

Full Sun to
Full Shade

6

Euphorbia myrsinites

Evergreen prostrate Perennial

2 (5)

Full Sun to
0.5 shade - 0.5 sun

7.5

Euryops pectinatus

Evergreen upright Shrub

30 (75)

Full Sun to
0.5 shade - 0.5 sun

8.5

X fatshedera lizei 'Lemon and Lime'
(x Fatshedera lizei 'Annamikels')

Evergreen Shrub

48 (120)

Full Sun to
Full Shade

8

Fatsia japonica 'Variegata'

Japanese aralia

Evergreen Shrub

60 (150)

7.5

Feijoa sellowiana
(acca sellowiana)

Pineapple guava, Fruit Salad Bush

Evergreen Shrub

40 (100)

Full Sun to
0.5 shade - 0.5 sun

8

Felicia amelloides 'Santa Anita'
(Agathaea coelestis 'Santa Anita')

Evergreen Shrublet

12 (30)

Full Sun to
0.25 Sun - 0.75 Shade

9

Ficus carica

Fig

deciduous large Shrub

84 (210)

Full Sun to
0.5 shade - 0.5 sun

7.5

Foeniculum vulgare 'Purpureum'

Purple Fennel

Herbaceous Perennial

48 (120)

Full Sun to
0.25 Sun - 0.75 Shade

7

Fragaria x ananassa 'Variegata'

Strawberry

Semi-evergreen Herbaceous plant

5 (12)

Full Sun to
0.25 Sun - 0.75 Shade

7

Fremento-dendron 'California Glory'

Upright Evergreen Shrub

96 (240)

Full Sun to
0.5 shade - 0.5 sun

7.5

Fuchsia 'Dollar Princess'

Half-hardy Shrub

30 (75)

Full Sun to
Full Shade

9

Fuchsia magellanica gracilis 'Variegata'

Hardy Fuchsia

Hardy Deciduous Shrub

24 (60)

Full Sun to
Full Shade

7.5

Galanthus 'Atkinsii'

Snowdrop

Hardy Bulb

6 (15)

Full Sun to
Full Shade

6

Gazania 'Daybreak Bronze'

Tender Perennial grown as an Annual

8 (20)

Full Sun to
0.25 shade - 0.75 sun

9

Genista aetnensis

Mount Etna Broom

Small effectively Evergreen Tree

84 (210)

Full Sun to
0.5 shade - 0.5 sun

7

Gentiana sino-ornata

Gentian

Evergreen spreading Perennial Alpine

2 (5)

Full Sun to
0.5 shade - 0.5 sun

6

Geranium endressii

Semi-evergreen Herbaceous plant

12 (30)

Full Sun to
Full Shade

6

Glechoma hederacea 'Variegata'

Variegated ground ivy

Trailing Semi-evergreen Herbaceous plant

4 (10)

Full Sun to
Full Shade

7

Grevillea juniperina sulphurea

Sulphur Spider Flower

Evergreen Shrub

30 (75)

Full Sun to
0.5 shade - 0.5 sun

7.5

Gunnera manicata

Huge Herbaceous Perennial

72 (180)

7.5

Gypsophila paniculata 'Bristol Fairy'

Babies' Breath

Herbaceous Perennial

24 (60)

Full Sun to
0.5 shade - 0.5 sun

7

Hebe albicans 'Red Edge'

Evergreen Shrub

12 (30)

6

Hedera colchica 'Dentata Variegata'

Variegated Elephant's Ear Ivy

Evergreen self-clinging Climber

84 (210)

Full Sun to
Full Shade

7

Hedychium gardnerianum

Ginger Lily

Rhizomatous Perennial

48 (120)

Full Sun to
0.25 Sun - 0.75 Shade

9

Helianthemum 'Wisley Pink'

Rock Rose

Small spreading Evergreen Shrub

6 (15)

Full Sun to
0.5 shade - 0.5 sun

6

Helianthus tuberosus 'Dwarf Sunray'

Jerusalem Artichoke

Deciduous Tuberous Vegetable

60 (150)

Full Sun to
0.25 Sun - 0.75 Shade

7

Helichrysum petiolare
(Helichrysum petiolatum)

Trailing or Semi-Climbing Evergreen Shrub

12 (30)

Full Sun to
Full Shade

8.5

Heliotropium peruvianum
(Heliotropium arborescens)

Marine Cherry Pie

Evergreen bushy Shrub

24 (60)

Full Sun to
0.5 shade - 0.5 sun

10

Heuchera micrantha 'Palace Purple'

Purple Alum Root

Evergreen clump-forming Herbaceous plant

12 (30)

Full Sun to
Full Shade

7.5

Hosta 'Thomas Hogg'
(Hosta undulata 'Albo-marginata)

Clump-forming Herbaceous Perennial

24 (60)

Full Sun to
Full Shade

5

Hyacinthus orientalis 'Pink Pearl'

Hyacinth

Hardy Bulb

6 (15)

Full Sun to
Full Shade

7

Hydrangea serrata 'Bluebird'

Hydrangea

Deciduous Shrub

30 (75)

Full Sun to
Full Shade

6

Iberis sempervirens

Evergreen Candytuft

Spreading Evergreen Shrub

4 (10)

Full Sun to
0.5 shade - 0.5 sun

5

Ilex aquifolium 'Perry's weeping'

Perry's Weeping Holly

Weeping Evergreen Tree

60 (150)

Full Sun to
Full Shade

7

Impatiens 'Novette Red Star'

Busy Lizzie

Evergreen bushy Perennial grown as an Annual

6 (15)

Full Sun to
Full Shade

10

Ipomoea rubro-caerulea 'Heavenly Blue'

Fast-growing Annual Climber

120 (300)

Full Sun to
0.5 shade - 0.5 sun

9

Iris danfordiae

Bulb

3 (7.5)

Full Sun to
0.5 shade - 0.5 sun

7

Iris unguicularis
(Iris stylosa)

Algerian Iris

Evergreen Rhizomatous Herbaceous plant

8 (20)

Full Sun to
0.5 shade - 0.5 sun

6

Jasminum polyanthum

Jasmine

Evergreen Climbing Shrub

84 (210)

Full Sun to
Full Shade

9

Juniperus sabina 'Tamariscifolia'

Juniper

Evergreen spreading Conifer

24 (60)

Full Sun to
0.25 Sun - 0.75 Shade

2

Lactuca sativa 'Salad Bowl'

Lettuce

Rosette-leaf Annual Vegetable

8 (20)

Full Sun to
0.5 shade - 0.5 sun

7

Lantana camara 'Spreading Sunset'

Fairly tender Evergreen Shrub

30 (75)

Full Sun to
0.5 shade - 0.5 sun

9.5

Lathyrus odoratus 'Patio Mixed'

Dwarf Sweet Pea

Hardy Annual

12 (30)

Full Sun to
0.5 shade - 0.5 sun

7

Laurus nobilis

bay

Evergreen Shrub or Tree

60 (150)

Full Sun to
0.25 Sun - 0.75 Shade

7.5

Lavandula angustifolia 'Munstead'

Lavender

Evergreen Shrub

24 (60)

Full Sun to
0.5 shade - 0.5 sun

7

Lewisia Cotylledon Hybrids

Evergreen rosette-forming Alpine

12 (30)

6

Lilium speciosum rubrum

Lily

Bulb with stem roots

40 (100)

Full Sun to
0.5 shade - 0.5 sun

7

Linum arboreum

Shrubby Flax

Evergreen compact Shrub

12 (30)

Full Sun to
0.5 shade - 0.5 sun

7.5

Lobelia 'Queen Victoria'

Herbaceous Perennial

24 (60)

Full Sun to
0.25 Sun - 0.75 Shade

8

Lobelia erinus 'Blue Cascade'

Half-hardy Perennial grown as an Annual

4 (10)

Full Sun to
Full Shade

10

Lonicera japonica 'Aureo-reticulata'

Variegated Japanese Honeysuckle

Evergreen Climber

84 (210)

Full Sun to
Full Shade

6

Lonicera nitida 'Baggesen's Gold'

Shrubby Honeysuckle

Evergreen Shrub

40 (100)

Full Sun to
0.25 Sun - 0.75 Shade

7

Lotus berthelotii

Trailing Perennial grown as an Annual

6 (15)

Full Sun to
0.25 Sun - 0.75 Shade

9

Lycopersicon esculentum 'Pixie'

Tomato

Annual bush

18 (45)

Full Sun to
0.5 shade - 0.5 sun

10

Lysimachia nummularia 'Aurea'

Creeping Jenny

Creeping Evergreen Perennial

1.5 (4)

Full Sun to
Full Shade

7.5

Magnolia stellata

Star Magnolia

Deciduous Shrub

60 (150)

Full Sun to
0.5 shade - 0.5 sun

6

Mahonia japonica

Evergreen Shrub

48 (120)

Full Sun to
Full Shade

6

Malus 'Ellison's Orange'

Apple

Deciduous Fruit Tree

84 (210) on an M9 or M27 rootstock

Full Sun to
0.5 shade - 0.5 sun

6

Malus sargentii

Sargent's Flowering Crab Apple

Deciduous Tree or Shrub

60 (150)

Full Sun to
0.5 shade - 0.5 sun

5

Mandevilla x amabilis 'Alice du Pont'

Evergreen Climber

84 (210)

Full Sun to
Full Shade

9.5

Matteuccia struthiopteris

Ostrich Fern

Deciduous Fern

30 (75)

5

Matthiola incana

Brompton Stock

Bushy biennial

18 (45)

Full Sun to
0.5 shade - 0.5 sun

7

Melianthus major

Large Honey Flower

Evergreen Shrub

72 (180)

Full Sun to
Full Shade

8

Mentha rotundifolia 'Variegata'
(Mentha suaveolens 'Variegata')

Variegated Apple Mint

Herbaceous Perennial Herb

12 (30)

Full Sun to
Full Shade

6

Microbiota decussata

Siberian Cypress

Spreading Coniferous Shrub

12 (30)

Full Sun to
0.25 Sun - 0.75 Shade

2

Mimulus aurantiacus
(Diplacus glutinosus)

Shrubby Monkey Flower

Evergreen trailing Shrub

18 (45)

Full Sun to
0.5 shade - 0.5 sun

8

Miscanthus sinensis 'Zebrinus'

Zebra Grass

Herbaceous Perennial Grass

48 (120)

Full Sun to
0.25 Sun - 0.75 Shade

6

Musa ensete
(Ensete ventricosum)

Abyssinian Banana

Enormous Evergreen Herbaceous plant

120 (300)

Full Sun to
Full Shade

9.5

Muscari armeniacum

Grape Hyacinth

Hardy Bulb

6 (15)

Full Sun to
Full Shade

6

Myosotis alpestris 'Royal Blue'

Forget-me-not

Biennial

12 (30)

Full Sun to
Full Shade

6

Myrtus communis

Common Myrtle

Upright Evergreen Shrub

84 (210)

Full Sun to
0.25 Sun - 0.75 Shade

8

ZONES Chart - Zones designate the lowest range of temperatures in which a plant will normally survive. Thus a plant in Zone 8 will normally survive between -12C and -6C (10F and 20F). Britain and Ireland are within zones 7-9 inclusive.

Deciduous plant - normally loses all its leaves in the winter. It may have different coloured coloured spring or autumn foliage

Evergreen plant - normally retains most of its leaves throughout the year. Evergreens are effective visually all year round and are useful as a permanent screen or shelter

Semi-evergreen plant - normally retains some leaves during a typical winter or dormant season.

House in winter to protect plant from severe frost damage. Move the plant pot into a greenhouse, or near a window for light in the house, shed or garage.

Since there is some seasonal variation in when a plant blooms from year to year, it cannot be precise but is a useful guide. Seasons are given rather than months since the former apply worldwide.

Plants vary in their requirement of direct sunlight: some have a wide tolerance, others have precise needs. Generally the middle of the range shown will give the best results. The shade section shows the proportion of daylight hours that the plant should be without direct sun:-

Zone
1
2
3
4
5
6
7
7.5
8
9
10

Centigrade
below -45
-45 to -40
-40 to -34
-34 to -29
-29 to -23
-23 to -18
-18 to -15
-15 to -12
-12 to -6
-6 to -1
-1 to 5

Fahrenheit
below -50
-50 to -40
-40 to -30
-30 to -20
-20 to -10
-10 to 0
0 to 5
5 to 10
10 to 20
20 to 30
30 to 40

blooms mid winter
blooms late winter
blooms mid spring
blooms late spring
blooms mid summer
blooms late summer
booms mid autumn
blooms late autumn

Direct Sun all day
No direct Sun for a quarter of the day
No direct sun for half the day
No direct sun for 3 quarters of the day
No direct Sun

or

Full Sun,
0.25 shade-0.75 sun,
0.5 shade - 0.5 sun.
0.25 sun - 0.75 shade,
Full Shade