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
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
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
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
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
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
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
| Month | Carrying the color |
|---|---|
| May | Salvia, catmint |
| June | Salvia, catmint, yarrow, blanket flower |
| July | Coneflower, yarrow, blanket flower, catmint |
| August | Agastache, coneflower, blanket flower |
| September | Agastache, blanket flower, catmint (round 2), salvia (round 2) |
| October | Agastache, 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
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