Deno’s Garden

Catalpa bignonioides

Genus Catalpa

Protocol

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 12 days to germinate.

100% germination in 5–12 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Catalpa p. 29Public domain
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Catalpa (Bignonicaceae). C. bignonioides fresh seeds germ. only in light or GA-3 treatment, but this slowly disappeared on DS (2nd Ed.). Experiments were conducted to see if Irradiating the seeds while dry would destroy the system blocking germination, but this was totally unsuccessful. Seeds irradiated eight inches under 40 watt fluorescent light for up to 50 d germ. germ, 70L(100% in 5-12 d) and 70D(none) the same as seeds not irradiated.
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Catalpa p. 29. 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.