Initially, I wrote this for myself, but maybe someone else finds it useful too.

Update: added categorization by color for easier color-oriented garden design.

• all 22x plant species (incl. 2x from the Supporter Pack DLC)
  
  
• all 126x plant varieties (spoilers!) including their seed color names¹
  
  
• convenient plant categorization by growth type²:
  
  🌱 climbing plants (need vertical support to grow)
  
  🌿 small bushes (grow bushy and need more space in planters)
  
  🌳 big bushes (grow broad and need space)
  
  🌾 tall plants (don't grow broad but high)
  
  🌷 small plants
  
  
• useful plant categorization by color³:
  
  
  • Yellow
    
  • Orange
    
  • Red
    
  • Pink
    
  • Purple
    
  • Blue
    
  • Green
    
  • Black
    
  • White
    
  • Wild
    
  • Special

¹ Note: you won't find color names in the in-game plant book; feel free to use this guide as a reference to see what varieties you might be missing for the 'I Want It All!' achievement.
² To know where/how to plant, especially when considering aesthetic placement of differently-sized plants. You will not believe how long I thought Morning Glory was a small plant. Oh gosh.
³ Useful when grouping flower colors together while designing the community garden.


Beware, this guide contains spoilers.

4 out of 22 plant species in this category.

These plants need vertical support for growth. Plant them near items such as a plant tag or a trellis. They will climb up the item when growing.

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Clematis (6x color varieties)

• Pale Pink Clematis
  
• Pink Clematis
  
• Lilac Clematis
  
• Purple Clematis
  
• White Clematis
  
• Wild Clematis

Ivy (4x color varieties)

• Pale Yellow Ivy
  
• Pale Green Ivy
  
• Dark Green Ivy
  
• Cream Ivy

Morning Glory (4x color varieties)

• Dark Pink Morning Glory
  
• Purple Morning Glory
  
• White Morning Glory
  
• Wild Morning Glory

Jasmine (3x color varieties)

• Yellow Jasmine
  
• Pink Jasmine
  
• White Jasmine

2 out of 22 plant species in this category.

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Bleeding Heart (4x color varieties)

• Red Bleeding Heart
  
• Pink Bleeding Heart
  
• Black Bleeding Heart
  
• White Bleeding Heart

Hosta (4x color varieties)

• Pale Pink Hosta
  
• Lilac Hosta
  
• White Hosta
  
• Wild Hosta

5 out of 22 plant species in this category.

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Fatsia (3x color varieties)

• Dark Green Fatsia
  
• Cream Fatsia
  
• Wild Fatsia

Hydrangea (8x color varieties)

• Dark Red Hydrangea
  
• Pale Pink Hydrangea
  
• Dark Pink Hydrangea
  
• Purple Hydrangea
  
• Pale Blue Hydrangea
  
• Blue Hydrangea
  
• Pale Green Hydrangea
  
• White Hydrangea

Peony (5x color varieties)

• Yellow Peony
  
• Dark Red Peony
  
• Pink Peony
  
• Dark Pink Peony
  
• White Peony

Rose (10x color varieties)

• Yellow Rose
  
• Orange Rose
  
• Red Rose
  
• Pink Rose
  
• Purple Rose
  
• Black Rose
  
• White Rose
  
• Wild Rose
  
• Alfred Rose
  
• Claude Rose

Lilac (5x color varieties)

• Pink Lilac
  
• Dark Pink Lilac
  
• Pale Blue Lilac
  
• White Lilac
  
• Wild Lilac

5 out of 22 plant species in this category.

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Amaryllis (7x color varieties)

• Yellow Amaryllis
  
• Peach Amaryllis
  
• Red Amaryllis
  
• Dark Red Amaryllis
  
• Pale Pink Amaryllis
  
• Dark Pink Amaryllis
  
• White Amaryllis

Sunflower (7x color varieties)

• Yellow Sunflower
  
• Orange Sunflower
  
• Red Sunflower
  
• Dark Red Sunflower
  
• Purple Sunflower
  
• White Sunflower
  
• Wild Sunflower

Iris (3x color varieties)

• Purple Iris
  
• Blue Iris
  
• Black Iris

Lily (7x color varieties)

• Yellow Lily
  
• Orange Lily
  
• Red Lily
  
• Pale Pink Lily
  
• Dark Pink Lily
  
• White Lily
  
• Wild Lily

Gerbera (6x color varieties) - available with Supporter Pack DLC

• Yellow Gerbera
  
• Orange Gerbera
  
• Red Gerbera
  
• Pink Gerbera
  
• White Gerbera
  
• Wild Gerbera

6 out of 22 plant species in this category.

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Cyclamen (6x color varieties)

• Red Cyclamen
  
• Pale Pink Cyclamen
  
• Pink Cyclamen
  
• Dark Pink Cyclamen
  
• White Cyclamen
  
• Wild Cyclamen

Hellebore (7x color varieties)

• Yellow Hellebore
  
• Light Pink Hellebore
  
• Pink Hellebore
  
• Dark Purple Hellebore
  
• Green Hellebore
  
• White Hellebore
  
• Wild Hellebore

Daffodil (5x color varieties)

• Pale Yellow Daffodil
  
• Yellow Daffodil
  
• Orange Daffodil
  
• Red Daffodil
  
• White Daffodil

Poppy (6x color varieties)

• Yellow Poppy
  
• Orange Poppy
  
• Red Poppy
  
• Pink Poppy
  
• White Poppy
  
• Wild Poppy

Tulip (10x color varieties)

• Yellow Tulip
  
• Orange Tulip
  
• Red Tulip
  
• Pink Tulip
  
• Purple Tulip
  
• Black Tulip
  
• White Tulip
  
• Wild Tulip
  
• Candy Club Tulip
  
• Rainbow Tulip

Pansy (6x color varieties) - available with Supporter Pack DLC

• Yellow Pansy
  
• Dark Pink Pansy
  
• Purple Pansy
  
• Pale Blue Pansy
  
• Black Pansy
  
• White Pansy

• 14x Yellow plants
  
• 8x Orange plants
  
• 14x Red plants
  
• 26x Pink plants
  
• 11x Purple plants
  
• 5x Blue plants
  
• 5x Green plants
  
• 5x Black plants
  
• 21x White plants
  
• 13x Wild plants
  
• 4x Special plants

There are 126x different plants (combinations of species and color).

Including color shades (e.g. light pink) and all four special colors (e.g. Alfred Rose),
there are 26 color varieties.

2 out of 26 color varieties in this category.

Pale Yellow Ivy
Pale Yellow Daffodil

Yellow Tulip
Yellow Jasmine
Yellow Sunflower
Yellow Poppy
Yellow Pansy - available with Supporter Pack DLC
Yellow Gerbera - available with Supporter Pack DLC
Yellow Lily
Yellow Daffodil
Yellow Rose
Yellow Peony
Yellow Hellebore
Yellow Amaryllis

2 out of 26 color varieties in this category.

Peach Amaryllis

Orange Lily
Orange Gerbera - available with Supporter Pack DLC
Orange Poppy
Orange Tulip
Orange Rose
Orange Sunflower
Orange Daffodil

2 out of 26 color varieties in this category.

Red Lily
Red Sunflower
Red Gerbera - available with Supporter Pack DLC
Red Cyclamen
Red Poppy
Red Rose
Red Tulip
Red Daffodil
Red Bleeding Heart
Red Amaryllis

Dark Red Peony
Dark Red Sunflower
Dark Red Hydrangea
Dark Red Amaryllis

4 out of 26 color varieties in this category.

Pale Pink Lily
Pale Pink Hydrangea
Pale Pink Clematis
Pale Pink Hosta
Pale Pink Cyclamen
Pale Pink Amaryllis

Light Pink Hellebore

Pink Cyclamen
Pink Bleeding Heart
Pink Rose
Pink Poppy
Pink Tulip
Pink Gerbera - available with Supporter Pack DLC
Pink Hellebore
Pink Peony
Pink Lilac
Pink Clematis
Pink Jasmine

Dark Pink Morning Glory
Dark Pink Peony
Dark Pink Pansy - available with Supporter Pack DLC
Dark Pink Lily
Dark Pink Hydrangea
Dark Pink Lilac
Dark Pink Cyclamen
Dark Pink Amaryllis

3 out of 26 color varieties in this category.

Lilac Hosta
Lilac Clematis

Purple Hydrangea
Purple Tulip
Purple Rose
Purple Pansy - available with Supporter Pack DLC
Purple Sunflower
Purple Morning Glory
Purple Iris
Purple Clematis

Dark Purple Hellebore

2 out of 26 color varieties in this category.

Pale Blue Lilac
Pale Blue Hydrangea
Pale Blue Pansy - available with Supporter Pack DLC

Blue Hydrangea
Blue Iris

3 out of 26 color varieties in this category.

Pale Green Ivy
Pale Green Hydrangea

Green Hellebore

Dark Green Ivy
Dark Green Fatsia

1 out of 26 color varieties in this category.

Black Tulip
Black Iris
Black Bleeding Heart
Black Rose
Black Pansy - available with Supporter Pack DLC

2 out of 26 color varieties in this category.

White Bleeding Heart
White Daffodil
White Hellebore
White Hydrangea
White Cyclamen
White Peony
White Sunflower
White Hosta
White Poppy
White Pansy - available with Supporter Pack DLC
White Gerbera - available with Supporter Pack DLC
White Lily
White Rose
White Tulip
White Lilac
White Amaryllis
White Clematis
White Morning Glory
White Jasmine

Cream Ivy
Cream Fatsia

1 out of 26 color varieties in this category.

Wild Hellebore
Wild Hosta
Wild Sunflower
Wild Tulip
Wild Gerbera - available with Supporter Pack DLC
Wild Rose
Wild Cyclamen
Wild Lily
Wild Morning Glory
Wild Fatsia
Wild Clematis
Wild Lilac
Wild Poppy

4 out of 26 color varieties in this category.

Candy Club Tulip
Rainbow Tulip

Alfred Rose
Claude Rose

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