Plants that I am familiar with as a landscaper. Not a complete or exhaustive list. The title "Landscapers palette" comes from the fact that these are the plants that for 95% of the time I would choose from when planning a planting scheme.

Exclusion doesn't always mean that a plant doesn't deserve a place here on merit, it may be because it's uncommon or difficult to get hold of - or of course that it doesn't deserve a place here on merit.

Name	picture	habit	difficult	seasons	height	spread	flower	everg	shd	sshd
Ajuga, Bugle		spreading			6in	2-3ft		Y	Y	Y
Alcea, hollyhock		upright		Su	8ft	2ft
Alchemilla mollis		clump	any, sun	SpSu	2ft	3ft		Y
Anemone huphensis japonica Honorine Jobert | Anemone japonica  | Anemone japonica seeds		upright		SuAut	2-4ft	?			Y	Y
Aquilegia - Columbine Black Collection | clematiflora Green Apples | clematiflora Mixed | Crown Jewels Mixed | McKana Giants | Nora Barlow | Sweet Rainbows Aquilegia viridiflora | William Guinness Doubles		clump		SpSu	2ft	1ft				Y
Aster hardy perennial		clump	sun, dry	Su	2ft	2ft
Artemesia "Powis Castle" - wormwood		woody		all	2ft	3ft		Y
Campanula - bell flower Bussage Blue | glomerata | lactiflora Pouffe | pers. Wortham Belle | Purple Sensation		upright		SpSu	2-6ft	2ft				Y
Crambe cordifolia		clump		SpSu	8ft	5ft
Delphinium Blackjack | Coral Sunset | Darwin's Blue Indulgence | Darwin's Pink Indulgence | Delft Blue | Duo Collection | Green Expectations | Green Twist | Hybrids | Lucia Sahin | Magic Fountains | Merel | New Zealand Hybrids | Pagan Purples | Sarita | Susan Edmunds		upright		SpSu	2-5ft	2ft
Name		habit	difficult	seasons	height	spread	flower	everg	shd	sshd
Echinacea angustifolia | Arts Pride | Collection | Kim's Duo Collection | Kim's Knee High | Kim's Mop Head | paradoxa | purpurea Magnus | Razzmatazz | Twosome | Vintage Wine		erect		SpSum	2-4ft	1-2ft
Eryngium - sea holly alpinum | Sea Holly bare root | E. alpinum - Sea Holly plants		clump	sun, dry	SuAut	3ft	1.5ft
Euphorbia griffithii Dixter | Mini Martini		upright or spread	exposed	Su-Win	1-4ft	3-4ft		Y
Fern Collection | Athyrium Lady in Red | Athyrium Ursula's Red		clump		all	2-3ft	2-3ft		Y	Y	Y
Grasses		clump		all	1-8ft	1-6ft		Y		Y
Hemerocallis - day lily Hemerocallis / day lily | x Ribbonette | ''Anne Welch'' | ''Baley Hay'' | ''Barbara Mitchell'' | ''Bela Lugosi''  | 'Blackberry Candy''  | Bonanza  | ''Bonanza''  | ''Canadian Border Patrol''  | ''Dominic''  | Double Firecracker  | ''Frans Hals''  | 'Golden Chimes''  | ''Joan Senior''  | ''Lilioasphodelus''  | Little Show Stopper  | Longfield  Twins  | ''Moonlit Masquerade''  | Piano Man		clump	clay, sun	SpSu	2-3ft	2-3ft		Y
Hosta Antioch | Aphrodite | Blue Dimples | Christmas Candy| Elisabeth | Fire and Ice | Flowering Collection| Francee | Guacamole - sweetly scented | Invincible | Parky's Gold | Patio Collection| Pearl Lake | Red October | Slug-free Collection| Sum and Substance | Thunderbolt | Wolverine | x tardiana Paradise Joyce		clump	shade, darker varieties	Sp-Aut	1-2ft	2-3ft			Y	Y
Name		habit	difficult	seasons	height	spread	flower	everg	shd	sshd
Iris Butter and Sugar | Caesar's Brother | Bearded Irises Collection | Japanese Collection | Bearded Mixed | Black Gamecock (Louisiana) | Black Taffeta | chrysographes | ollection | Dancer's Veil | danfordiae | Dwarf Mixed | Eden's Paintbrush | foetidissima | Her Highness (Louisiana) | Jane Phillips | Katharine Hodgkin | Light and Dawn | Louisiana Brookvale Nocturn | Louisiana Cajun Capers | Louisiana Collection | Louisiana Colorific | Louisiana Patient Reward | Louisiana Rhett | Louisiana Silent Woods | Madi Moonlight | Natchez Trace | Pegaletta (Louisiana) | Pin Stripe | Sea Wisp (Louisiana) | sibirica Collection | sibirica Mixed | Sorcerer's Triumph | Sparkling Rose | Umi-Kaze | unguicularis Mary Barnard		rhiz	dry shade - only foetidissima	Su-Win	1-3ft	1-3ft		Y	Y	Y
Kniphofia - red hot poker Green Jade | Little Maid - Dwarf Hot Poker		rhiz	exposed	Su	3ft	2ft		Y
Lavandula lavender		bushy	poor soil	Sp-Aut	1-2ft	2-4ft		Y
Lupin Dwarf Mixed | Russell Hybrids | Tutti Frutti™		upright		SpSu	5ft	2ft
Perovskia atripifolia - Russian sage		upright		SuAut	3-4ft	3-4ft
Phormium Bronze Baby | Collection | Jester | Rainbow Maiden		clump	clay, exposed	all	8-12ft	6ft		Y		Y
Rudbeckia Cherokee Sunset | fulgida Goldsturm | Goldsturm		rhiz		SuAut	3ft	3ft
Name		habit	difficult	seasons	height	spread	flower	everg	shd	sshd
Salvia - sage ictineria | tricolour | purple		erect / spread		Sp-Aut	1ft	1-2ft		Y
Santolina		clump	sun	all	3ft	3ft		Y
Scabiosa - Scabious Burgundy Bonnets | Blue Diamond | caucasica Clive Greaves | Misty Butterflies		clump		SpSu	2ft	2ft
Sedum - Ice - plant Citrus Twist | Lynda Windsor | Pink Chablis		erect	any, sun exposed	SuAut	2ft	2ft		Y		Y
Name		habit	difficult	seasons	height	spread	flower	everg	shd	sshd