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Pictured: Rubus idaeus — the species. This subspecies isn’t separately illustrated.
Rosaceae family

Grayleaf Red Raspberry (subsp. strigosus) Rubus idaeus subsp. strigosus subspecies

Native Specialist-bee host
Deer favourite — Rated highly palatable to browsing deer — so where deer are around, expect this one to get nibbled. It's a documented preference, not a certainty: pressure swings with the place and season, and a fenced or low-deer yard may be untouched.

Grayleaf Red Raspberry (subsp. strigosus) is a perennial shrub native to Alaska, Canada, and the lower 48 states. It grows to 4 ft and blooms Aug in part shade – shade, with red fruit. A host for pollen-specialist native bees.

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
USDA PLANTS — Sun
USDA — SoilPH — Soil pH
USDA PLANTS (DwCA, Zenodo 17903503) — Fertility Requirement / Soil Adaptation — Adapts to
USDA — Temp-Min °F — Hardiness
Sun
Part shade – shade
Soil pH
5–7.5
Adapts to
Coarse (sandy), Medium (loam)
Hardiness
USDA zone 1+
Size & form
Sources · Size & form
USDA PLANTS (DwCA, Zenodo 17903503) — Height, Mature — Height
USDA PLANTS (DwCA, Zenodo 17903503) — Planting Density (per acre) — Spacing
USDA PLANTS (DwCA, Zenodo 17903503) — Growth Rate / Spread / Growth Form / Lifespan / Active Growth Period / Seed Period — Growth rate · Growth form
USDA PLANTS — Lifespan
TRY Plant Trait Database (CC BY 4.0) · USDA PLANTS — Foliage
USDA PLANTS (DwCA, Zenodo 17903503) — Fruit/Seed Color / Fruit Persistence — Fruit
Height
4 ft
Spacing
3–6 ft apart from USDA planting density
Growth rate
Rapid
Growth form
Thicket-forming
Lifespan
Perennial · short-lived
Foliage
Broadleaf · coarse texture
Fruit
Red
In the garden
Sources · In the garden
USDA PLANTS (DwCA, Zenodo 17903503) — Propagation Method / Commercial Availability — Propagate by
USDA PLANTS (DwCA, Zenodo 17903503) — Germination (cold stratification) — Seed starting
USDA PLANTS — Seed Period — Seeds ripen
USDA PLANTS (DwCA, Zenodo 17903503) — Foliage Texture / Browse Palatability / Resprout — Deer browsing · Resprouts if cut
Propagate by
Cuttings
Seed starting
No stratification needed
Seeds ripen
Summer – Autumn seed-collection / harvest window
Deer browsing
High browsed readily
Resprouts if cut
No
Shrub layer — Sits in the shrub of a layered food forest or polyculture.Open guide →
derived roles
The garden year bloom → fruit → fall colour
J
F
M
A
M
J
J
A
S
O
N
D
Bloom
Fruit
Bloom (the flower's colour) Ripe fruit
Bloom · Aug — USDA PLANTS (DwCA, Zenodo 17903503) — BloomPeriod
Fruit · approximate season (USDA Seed Period), clamped to after bloom
When to sow · for your area

Sow timing keys off your local last- and first-frost dates.

Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts ~163 caterpillar species

Rubus supports ~163 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 Rubus in North America, including:

Abagrotis pulchrata · owlet moth Acharia stimulea · Saddleback Caterpillar Moth Acleris bowmanana · leafroller moth Acleris britannia · Brittania Moth Acleris fragariana · leafroller moth Acleris keiferi · leafroller moth
+ 8 more species →
Acleris laterana · leafroller moth Acleris macdunnoughi · leafroller moth Acleris variegana · leafroller moth Acronicta americana · American Dagger Moth Acronicta brumosa · Charred Dagger Acronicta distans · owlet moth Acronicta funeralis · Funerary Dagger Acronicta impressa · Impressed Dagger Moth
Keystone count (genus-level) from Warren II 2026 (CC0) · Tallamy host-use records. Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
✦ Bees specialist-bee host

Specialist native bees depend on it.

Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Rubus is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.

Xerces pollinator conservation →
Specialist hosts from Smith et al. 2024.
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (26) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[18] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[19] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts · Smith et al. 2024 (CC BY)
[20] Conservation rank — NatureServe Explorer (CC BY)
[22] Functional traits — TRY Plant Trait Database (CC BY 4.0)
[24] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[25] Caterpillar species — NHM HOSTS (CC0)
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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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