Mendel’s Gardens

Oenothera triloba

Stemless Evening Primrose · Sessile Evening Primrose

Family OnagraceaeGenus Oenothera

About the plant

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

Habit
Annual, Biennial, Forb/herb
Native range
Native to the lower 48 states

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

Source: PLANTS Database — USDA NRCS.

Protocol

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 21 days to germinate.

Germinates in 21 days.

A few only. Deno gives no count.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, OenotheraPublic domain
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Oenothera (Onagraceae). While many species germ. well in dark treatments, 0. biennis has an absolute light requirement so that photorequirements have to be considered in this genus. 0. triloba germ. a few in the 3rd w at 70.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Oenothera. 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.