Mendel’s Gardens

Yucca glauca

Soapweed Yucca

Family AsparagaceaeGenus Yucca

About the plant

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

Safety

Toxicity
Low severity. Roots. Saponins.

The plant

Habit
Perennial, Forb/herb, Shrub, Subshrub
Height
1 ft
Flower
White
Blooms
Late Spring
Native range
Canada, lower 48 states

Growing conditions

Sun
Shade tolerance: High
Moisture
Moisture use: Low

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

Sources: PLANTS Database — USDA NRCS; Extension Gardener Plant Toolbox — NC State Extension.

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 27, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 9 days to germinate.

90% germination in 5–9 days.

90% sown warm, most of it inside nine days. Fresh seed or six months' dry storage at 70 or 40 -- Deno got the same either way.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, YuccaPublic domain
Show the original text
Yucca (Liliaceae). V. glauca germ. 70(90% largely in 5-9 d) and 40-70(80-90% in 2-4 d) with either fresh seed or seed DS 6 m at 70 or 40..
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Yucca. 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 January 1, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    Deno gives no length for this period; three months is his standard cycle.

  2. Warm moist stratification

    Temperature: 70°F 21°C

about 3 months from start to sowing. Then 4 days to germinate.

80% germination in 2–4 days.

80-90% and quicker off the mark after a cold period. Fresh seed or six months' dry storage at 70 or 40 -- Deno got the same either way.

This source doesn't state how long.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, YuccaPublic domain
Show the original text
Yucca (Liliaceae). V. glauca germ. 70(90% largely in 5-9 d) and 40-70(80-90% in 2-4 d) with either fresh seed or seed DS 6 m at 70 or 40..
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Yucca. 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.