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Iberis umbellata

Globe Candytuft · Garden Candytuft

Family BrassicaceaeGenus Iberis

A flat head of pale pink four-petalled flowers, the outer ones with two enlarged petals
FlowerHectonichusCC BY-SA 3.0

About the plant

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

The plant

Habit
AnnualExtension Gardener Plant Toolbox
Habit
annual or biennialPlants of the World Online
Height
1-1.5 ft30-45 cmExtension Gardener Plant Toolbox
Spread
0.5-1 ft15-30 cmExtension Gardener Plant Toolbox
Flower
Pink, Purple/Lavender, Red/Burgundy, WhiteExtension Gardener Plant Toolbox
Blooms
SpringExtension Gardener Plant Toolbox

Growing conditions

Sun
Full sun; Partial ShadeExtension Gardener Plant Toolbox
Soil
Clay, Loam (Silt), SandExtension Gardener Plant Toolbox
Soil pH
Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0)Extension Gardener Plant Toolbox
Moisture
Good DrainageExtension Gardener Plant Toolbox

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

Sources: Extension Gardener Plant Toolbox — NC State Extension; Plants of the World Online — Royal Botanic Gardens, Kew.

Worth knowing

  • Iberis comes from Iberia, the ancient name of Spain, and umbellata refers to the umbrella-like shape of the flower clusters of garden candytuft. Wikipedia: Iberis umbellata

This source reports 5 treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 19, 2027 for a May 3 last frost.

  1. Alternating temperatures

    Temperature: 40–70°F 4–21°C

Germination happens during step 1, in 17 days.

100% germination in 6–17 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Iberis p. 49Public domain
Show the original text
Iberis (Brassicaceae). I. umbellata germ. 70D(95% in 4-20 d), 70L(70% in 4-28 d), OS(100% in 6-17 d), OT(100% on 7th d in Oct.), and 40(86% in 3rd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Iberis p. 49. 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, 1996

Difficulty Low Rated by us, not by the source.

  1. Sow outdoors and leave it

No stated waiting before sowing.

100% germination.

This source doesn't state how long step 1 lasts.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Iberis p. 49Public domain
Show the original text
Iberis (Brassicaceae). I. umbellata germ. 70D(95% in 4-20 d), 70L(70% in 4-28 d), OS(100% in 6-17 d), OT(100% on 7th d in Oct.), and 40(86% in 3rd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Iberis p. 49. 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 3

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 20 days to germinate.

95% germination in 4–20 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Iberis p. 49Public domain
Show the original text
Iberis (Brassicaceae). I. umbellata germ. 70D(95% in 4-20 d), 70L(70% in 4-28 d), OS(100% in 6-17 d), OT(100% on 7th d in Oct.), and 40(86% in 3rd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Iberis p. 49. 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 4

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Cold moist stratification

    Temperature: 40°F 4°C

Germination happens during step 1, in 21 days.

86% germination in 21 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Iberis p. 49Public domain
Show the original text
Iberis (Brassicaceae). I. umbellata germ. 70D(95% in 4-20 d), 70L(70% in 4-28 d), OS(100% in 6-17 d), OT(100% on 7th d in Oct.), and 40(86% in 3rd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Iberis p. 49. 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 5

DerivedN. C. Deno, 1996

Difficulty Low Rated by us, not by the source.

Start around March 8, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 28 days to germinate.

70% germination in 4–28 days.

Seed Germination Theory and Practice, 1st Supplement — N. C. Deno, 1996 · 1st Supplement, Iberis p. 49Public domain
Show the original text
Iberis (Brassicaceae). I. umbellata germ. 70D(95% in 4-20 d), 70L(70% in 4-28 d), OS(100% in 6-17 d), OT(100% on 7th d in Oct.), and 40(86% in 3rd w).
Seed Germination Theory and Practice, 1st Supplement, 1st Supplement, Iberis p. 49. 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.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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