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Helianthemum salicifolium

Willowleaf Frostweed · Willow-leaved Rock Rose

Family CistaceaeGenus Helianthemum

Two small yellow five-petalled flowers with a red bud beside them, on a slim leafy stem in short turf.
FlowerKrzysztof Ziarnek, KenraizCC BY-SA 4.0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
annualPlants of the World Online
Habit
Annual, Forb/herbPLANTS Database
Flower
YellowRead from the photograph on this page
Native range
Albania, Algeria, Baleares, Bulgaria, Canary Is., Corse and elsewhereGBIF Backbone Taxonomy

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Read from the photograph on this page — Deno's Garden; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 29, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 7 days to germinate.

80% germination in 5–7 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, HelianthemumPublic domain
Show the original text
Helianthemum (Cistaceae). H. salicifolium germ. 70(80% in 5-7 d) and 40(71%)-70(12%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helianthemum. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

    71% germinated at 40 itself.

  2. Warm moist stratification

    Temperature: 70°F 21°C

    A further 12% after the move.

Germination happens during step 2; time not stated, 21 days assumed.

71% germination.

Either route works; sowing at 70 is faster.

This source doesn't state how long step 1 lasts.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, HelianthemumPublic domain
Show the original text
Helianthemum (Cistaceae). H. salicifolium germ. 70(80% in 5-7 d) and 40(71%)-70(12%).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Helianthemum. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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