Tanacetum dolichophyllum
Also published as Hippolytia dolichophylla, Hippolytia longifolia. You are in the right place.
About the plant
What it is and where it grows — not part of any germination protocol.
- Note
- WFO and POWO both move this species to Hippolytia but disagree on the epithet, so Deno's name stands here
Toxicity is noted only where a source states it. No note here is not a finding of safety.
Source: 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 29, 2027 for a May 3 last frost.
Sow and cover
Temperature: 70°F 21°C
No stated waiting before sowing. Then 7 days to germinate.
100% germination — first up on day 3, then 30% a day.
Every seed. First up on the third day, then 30% of the packet a day after that.
Protocol 2
DerivedN. C. Deno, 1993Difficulty Low
Start around December 30, 2026 for a May 3 last frost.
Cold moist stratification
Duration: 90 daysTemperature: 40°F 4°C
Deno gives no length for this period; three months is his standard cycle.
Warm moist stratification
Temperature: 70°F 21°C
about 3 months from start to sowing. Then 6 days to germinate.
100% germination in 2–6 days.
The cold changes nothing but the calendar. Still every seed.
This source doesn't state how long.