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Fabaceae family

Warminster Broom Cytisus ×praecox hybrid

Warminster Broom is an introduced perennial shrub, found in the lower 48 states.

More about this plant

Cytisus × praecox, the Warminster broom, is an artificial hybrid species of flowering plant in the family Fabaceae. Its parents are Cytisus multiflorus and Cytisus oromediterraneus. A deciduous shrub, it is available from commercial suppliers. It has a number of cultivars, including 'Allgold' and 'Warminster', which have both gained the Royal Horticultural Society's Award of Garden Merit. Other commercially available cultivars are 'Albus' and 'Lilac Lady'. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 7 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Perennial
In the garden
Shrub layer — Sits in the shrub of a layered food forest or polyculture.Open guide →
derived roles
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 ~8 caterpillar species

Cytisus supports ~8 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 a modest genus for introduced plants — native genera typically support far more.

Recorded feeding on Cytisus in North America, including:

Aethalura intertexta · Four-Barred Gray Agonopterix nervosa · concealer moth Arctia caja · Garden Tiger Argyrotaenia citrana · leafroller moth Discestra trifolii · owlet moth Ectropis crepuscularia · Small Engrailed
+ 4 more species →
Etiella zinckenella · snout moth Leucoptera spartifoliella Spilosoma virginica · Virginian Tiger Moth Uresiphita reversalis · Genista Broom 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).
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 (10) 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)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[06] Description — Wikipedia (CC BY-SA)
[07] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[08] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[09] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[10] Caterpillar species — NHM HOSTS (CC0)
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