An easy to grow, long-blooming Garden 
Dressed in Pink 

Pink is one of the most common flower colors, especially in the cottage garden.

Feel free to switch out plants for those you might prefer. Be sure to check for cold hardiness and the same attributes.
Add potted pink perennial plants and place wherever you like among or around these suggested plantings.

4-Plant Planting List:

Design the size you'd like for your garden, and plant as many of these suggested plants that would fit in those spaces. Add more of these plants in pretty bright, hot pink, and candy pink planters. Expand this garden every season if you have the room.

A - Ninebark "Tiny Wine"
A pretty backdrop color for the pink garden.
Type Shrub 
Blooms Deep burgundy foliage, white flowers
Size 3 to 5 ft. tall, 3 to 4 ft. wide 
Hardiness Cold-hardy in USDA zones 3 to 7

B - Coneflower (Echinacea purpurea Prairie Splendor)
Choose any pinks, rubies or purples. Mix them up if you like.
Try a variety called "Lime Twister" along with just pink perennials - The blooms are a beautiful combination of deep pink and lime. 
I grow these, and they're an awesome and easy to care for plant. Bonus: The dried cone (seed head) feeds the birds in the fall. Medicinal teas are often made from the dried leaves and seed heads.
Type Perennial 
Blooms Purple-pink flowers in early summer to fall
Size 14 to 16 in. tall, 12 to 14 in. wide 
Hardiness Cold-hardy in USDA zones 3 to 9

C - Pink Veronica "Fairytale"
Type Perennial
Blooms Pale pink in early summer and fall 
Size 12 to 16 in. tall, 12 to 15 in. wide 
Hardiness Cold-hardy USDA zones 3 to 8
See substitution pic below

D - Dianthus ‘Sweetie Pie’
Type Perennial
Blooms Pink flowers in early summer
Size 8 to 10 in. tall, 16 to 20 in. wide
Hardiness Cold-hardy in USDA zones 4 to 9

More Pink Perennials For Your Garden
Any 4 you choose can replace plants of the same size suggested above.
When substituting, check the USDA Cold Hardiness Map for appropriate varieties for your zone