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Landscaping

Perennials for Season-Long Color in Colorado

Continuous color isn't about finding one magic plant — it's six reliable perennials with overlapping bloom windows and two well-timed haircuts.

Published
August 15, 2026
Reading
8 min
By
BigBoy Builders

The Relay-Race Bed

No perennial blooms from May to October. A bed that looks like it does is a relay race — early bloomers hand off to midsummer workhorses, which hand off to the fall closers, with a couple of long-runners bridging the gaps. Six plants are enough to run the whole race on the Front Range, and every one of them is comfortable on a modest water budget.

Salvia shrub

Salvia

Salvia nemorosa

Height
18–24 inches
Width
12–18 inches
Sun
Full sun
Water
Low
Bloom
May–June, reblooms with cutback

The early anchor — deep violet spikes open the season in May and draw the first bees of the year. Shear it back hard after the first bloom collapses and it returns with a second flush in late summer.

Rigid, upright, and deer-resistant; it gives the front third of a bed its structure.

Catmint shrub

Catmint

Nepeta racemosa

Height
12–18 inches
Width
18–30 inches
Sun
Full sun
Water
Low
Bloom
May–September with one haircut

The longest-running bloomer in the lineup — soft lavender-blue clouds that start with the salvia and, given one mid-season shearing, keep going into September. It softens walk edges and spills over walls without becoming a thug.

Nearly unkillable in Colorado conditions; if a bed can only have one plant, this is the argument.

Yarrow shrub

Yarrow

Achillea spp.

Height
18–30 inches
Width
18–24 inches
Sun
Full sun
Water
Very low
Bloom
June–September

Flat gold landing pads over ferny foliage, all summer, on almost no water. Cut spent heads to a side bud and it repeats into fall.

It earns the middle of the bed — tall enough to layer, tough enough to ignore.

Purple Coneflower shrub

Purple Coneflower

Echinacea purpurea

Height
24–36 inches
Width
18–24 inches
Sun
Full sun to light afternoon shade
Water
Low to moderate
Bloom
July–September

The midsummer centerpiece — big purple daisies that butterflies treat as furniture. It bridges the gap between the June bloomers and the fall finishers.

Leave the seed cones standing after frost; goldfinches work them all winter and the stalks carry the bed's structure into the snow.

Blanket Flower shrub

Blanket Flower

Gaillardia aristata

Height
12–24 inches
Width
12–18 inches
Sun
Full sun
Water
Very low
Bloom
June–frost

The iron man — red-and-gold blooms from June until a hard freeze with no meaningful care. A native that treats poor soil, heat, and neglect as normal working conditions.

Deadhead when you're nearby and it blooms harder; ignore it and it blooms anyway.

Hummingbird Mint shrub

Hummingbird Mint

Agastache spp.

Height
24–36 inches
Width
18–24 inches
Sun
Full sun
Water
Low
Bloom
August–October

The fall closer. When most beds fade in August, agastache is just getting loud — orange-pink spires that carry color and hummingbirds into October.

Give it sharp drainage and skip the winter cutback; its standing stems protect the crown and feed birds.

The Calendar, Assembled

MonthCarrying the color
MaySalvia, catmint
JuneSalvia, catmint, yarrow, blanket flower
JulyConeflower, yarrow, blanket flower, catmint
AugustAgastache, coneflower, blanket flower
SeptemberAgastache, blanket flower, catmint (round 2), salvia (round 2)
OctoberAgastache, blanket flower — to frost
  • Plant in drifts of three to five; a repeated drift pattern reads as designed, singles read as collected.
  • Layer by height — catmint and blanket flower in front, salvia and yarrow mid, coneflower and agastache behind.
  • The two haircuts that earn their time: shear salvia hard after first bloom, shear catmint by half in midsummer. Both come back swinging.
  • One drip zone with per-plant emitters covers the whole list; deep soak weekly in summer, less after year one.
  • Leave everything standing through winter — the seed heads feed birds and the stems insulate crowns. Cut back in March.

Questions / Field Notes

Frequently asked questions

Want the bed built, not just planned?

BigBoy designs and installs perennial beds — soil prep, drip, plants in drifts, and mulch or rock finishes with clean edges.

When it's past DIY

The services this connects to.

Built different.

Questions this guide didn't answer?

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