Rocky Mountain Goldenrod Solidago multiradiata
Rocky Mountain Goldenrod is a perennial shrub native to Alaska, Canada, and the lower 48 states. It grows to 1 ft and blooms Aug in part shade – shade. A host for pollen-specialist native bees.
Growing & care
USDA PLANTS · TRY- Sun
- Part shade – shade
- Soil pH
- 5–7.3
- Fertility need
- Medium
- Adapts to
- Coarse (sandy)
- Hardiness
- USDA zone 1+
- Height
- 1 ft
- Mature width
- ~ 1 ft wide DERIVED derived estimate — open-grown crown allometry (height × growth-form ratio); not a measurement
- Spacing
- 1.5–3 ft apart from USDA planting density
- Growth form
- Single stem
- Lifespan
- Perennial · short-lived
- Foliage
- Broadleaf · medium texture
- Active growth
- Spring & summer
- Flower colour
- Yellow AI AI image-analysis of community-science photos (~87% expert agreement) — not a botanical record
- Seed starting
- Needs cold stratification a cold-moist spell before it germinates
- Resprouts if cut
- No
Sow timing keys off your local last- and first-frost dates.
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts ~118 caterpillar species
Solidago supports ~118 caterpillar species.
Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is an exceptional genus.
Recorded feeding on Solidago in North America, including:
+ 8 more species → ↑ show fewer
✦ Bees specialist-bee host · 22 bee visitors
Specialist native bees depend on it.
Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Solidago is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.
22 native & managed bee species are documented visiting Rocky Mountain Goldenrod — the 12 most-recorded:
Wildlife & visitors 1 mammal · 12 nectaring
Open records of who else uses Rocky Mountain Goldenrod — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 1 mammal species (fruit, seed, browse):
12 adult butterfly & moth species are recorded nectaring at its flowers — the most-recorded:
Across 66 U.S. vegetation-survey plots that recorded Rocky Mountain Goldenrod, these catalog species turned up most often in the same plot — a real field co-occurrence signal, not a planting prescription.
Related plants
More Solidago →
How we know this (3) Methods & honest limits
We take the plant’s U.S. county range and look up each county’s long-term climate, then summarise: native rainfall = the median annual rainfall across its counties; heat tolerance = the warm end (90th percentile) of average temperature across its range (mirroring how our cold-hardiness floor uses an extreme). Counties + medians blunt the roadside/observer bias that makes point-level climate unreliable. Needs at least five placeable counties.
Honest limits: A realized, sampling-biased niche (where it has been recorded, not its physiological optimum), and county climate is coarse — large Western counties span deserts and mountains. Derived guide, never a measured fact.
For woody plants that have a height but no measured crown, we estimate width = height × a crown-to-height ratio fit for that plant’s form (conifers narrower than broadleaf trees, shrubs widest), calibrated on our measured open-grown crowns and capped at the largest one ever measured. A measured crown always wins; herbaceous plants get nothing (no anchor).
Honest limits: A coarse class-median estimate for garden-scale spacing, not a measurement; woody single/multi-stem forms only.
McKenzie et al. assigned each species a flower colour with a GPT-4V vision model over iNaturalist photos. We use the confident tier plus a separately-labelled lower-confidence top-up (mostly inconspicuous green/brown flowers), and render it as a small tint — never as an asserted fact, and kept out of the written synopsis.
Honest limits: AI image inference (~87% expert agreement on the confident tier); a decorative, confidence-tiered indicator, not a measured trait.
Sources for this entry (36) Open & cited
Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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