Sphaeromeria capitata
Rock Tansy
Also published as Tanacetum capitatum, Artemisia capitata. You are in the right place.
About the plant
What it is and where it grows — not part of any germination protocol.
- Habit
- Perennial, Forb/herbPLANTS Database
- Native range
- Native to the lower 48 statesPLANTS Database
- Note
- GBIF and POWO move this species to Artemisia; WFO and USDA PLANTS keep SphaeromeriaGBIF Backbone Taxonomy
Toxicity is noted only where a source states it. No note here is not a finding of safety.
Sources: PLANTS Database — USDA NRCS; GBIF Backbone Taxonomy — Global Biodiversity Information Facility.
This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Low
Start around March 27, 2027 for a May 3 last frost.
Sow and cover
Temperature: 70°F 21°C
No stated waiting before sowing. Then 9 days to germinate.
100% germination in 5–9 days.
Every seed, inside nine days, with no treatment of any kind.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low
Start around February 8, 2027 for a May 3 last frost.
Cold moist stratification
Temperature: 40°F 4°C
100%, over 4-8 weeks -- it germinates in the cold.
No stated waiting before sowing. Then 56 days to germinate.
100% germination in 28–56 days.
Cold gets there too, and takes a month or two longer about it.
This source doesn't state how long.