Why Shade Gardening Is Different at Colorado Elevation
Shade gardening in Colorado isn’t quite the same as shade gardening at sea level. Because Colorado’s elevation is considerably higher than most of the country, sunlight reaching the ground is generally more intense, so areas described as “partial shade” can behave more like full sun elsewhere. This means a plant tag that says “partial shade” based on testing at lower elevations may need adjusting for a Colorado yard — a spot that gets a few hours of direct afternoon sun at altitude may stress a plant that would be fine with that much sun at sea level. It’s a reasonable idea to treat shade and sun ratings on plant tags as a rough starting point in Colorado rather than an exact rule.
Dry Shade vs. Moist Shade: Figuring Out Which You Have
Before picking plants, it generally helps to figure out which type of shade you’re actually dealing with:
- Dry shade — typically found under mature trees, where tree roots compete heavily for available water and the canopy blocks rain from reaching the soil evenly. This is a common condition in established Colorado yards with large shade trees.
- Moist shade — typically found on north-facing foundation beds, near downspouts, or in other spots that stay shaded but still get regular moisture.
These two conditions call for different plants, and trying to grow a moisture-loving plant in dry shade (or the reverse) is a common source of frustration. Watching a spot for a season, including after watering or rain, is a reasonable way to tell which category it falls into.
Best Plants for Dry Shade in Colorado
For dry, shaded spots under trees, tougher and more drought-tolerant plants tend to be a better fit. Commonly suggested options include:
- Creeping Oregon grape (Mahonia repens) — a low-growing evergreen shrub generally considered tolerant of both shade and dry soil.
- Waxflower (Jamesia americana) — a native shrub noted for handling dry, shaded conditions reasonably well.
- Coral bells (Heuchera) — grown mainly for foliage color, and generally tolerant of some dryness once established.
Best Plants for Moist Shade in Colorado
Where shade stays consistently damp, a wider range of classic shade perennials tends to do well, including:
- Hostas — reliable foliage plants in moist shade, though they may need supplemental water during dry spells even in a shaded spot.
- Ferns — generally suited to consistently moist, shaded conditions.
- Astilbe — valued for feathery summer flower plumes and a general preference for moist soil.
- Rocky Mountain columbine (Aquilegia coerulea) — Colorado’s state flower, generally considered a good fit for cooler, moist shade.
Perennials That Generally Hold Up Well in Shade
Among the plants above, coral bells and Rocky Mountain columbine are worth calling out specifically as perennials that tend to be dependable in shade — coral bells for its tolerance of drier conditions and long-lasting foliage color, and columbine for its adaptation to Colorado’s climate and its ability to self-seed modestly in suitable spots. Hostas are also a frequently recommended shade perennial, though they lean toward the moist-shade side of the spectrum described above.
What Can Grow in Very Deep (Near 100%) Shade?
Very deep shade — for instance, under a dense evergreen canopy or close against a north-facing wall with little reflected light — is a harder condition for most plants, including many on the lists above. In these near-100%-shade spots, foliage-focused groundcovers and ferns tend to be a more realistic choice than flowering perennials, since flowering generally slows or stops without at least some filtered or indirect light. It’s worth treating very deep shade as its own category and expecting a narrower, foliage-heavy plant list rather than assuming typical “shade plants” will perform the same way they would in dappled or partial shade.
Soil and Mulch Prep for Colorado Shade Beds
Because Colorado’s climate is generally dry and shade beds are often also competing with tree roots, soil prep tends to matter more here than in wetter regions. Working organic compost into the soil before planting can help improve moisture retention, and a layer of wood mulch over the bed can help reduce evaporation between waterings. This combination is particularly relevant for dry-shade areas under trees, where soil can otherwise stay persistently depleted of both nutrients and moisture.
Quick Tips for a Colorado Shade Garden
- Identify dry vs. moist shade first, since plant needs differ meaningfully between the two.
- Discount plant-tag sun ratings slightly to account for Colorado’s more intense high-altitude sunlight.
- Prep soil with compost and mulch, especially in dry shade under mature trees.
- Favor native and regionally adapted species where possible — options like creeping Oregon grape, waxflower, and Rocky Mountain columbine tend to be reasonably well suited to Colorado conditions specifically, more so than shade plants selected without regard to region.
- Treat very deep shade as a separate planning category, leaning on foliage plants and ferns rather than bloom-focused perennials.
For gardeners weighing a broader low-upkeep approach to shade beds generally, not specific to Colorado’s climate, this guide to low-maintenance shade garden design covers plant choices and layout ideas that can be adapted to a Colorado yard with the regional notes above in mind.