Germination Guide

Click on a species name below to see it's germination tips.
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Allium 'Purple Splendour'

J

Sow @4°C for 3 weeks, then place @20°C.
Allium 'Setlife'

J

Sow @4°C for 3 weeks, then place @20°C.
Allium 'Silver Spring'

A

Sow @ 20°C. Seed germinates within 3 months.
Allium 'Summer Beauty'

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Allium 'Summer Pink'

J

Sow @4°C for 3 weeks, then place @20°C.
Allium acuminatum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium aflatunense

E

Sow @ 20°C for 6 weeks, then place @ 4°C for 6 weeks, then slowly raise temperature to 10°C for 6 weeks. If there is no germination, repeat the cycle. This mimics fall sowing outdoors for spring germination.
Allium aflatunense 'Purple Sensation'

*

This species needs special care as described.

6

Requires scarification. Nick or rub between sheets of sandpaper.  See https://youtu.be/icB9HrqdQqU  Seed coat of Baptisia and Oxytropis and other Fabaceae can be scarified by soaking in boiling water. See http://botanicallyinclined.org/continuing-the-sowing-in-hot-water

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
scarify one year old seeds with sulfuric acid for 15 min, and stratify at 4°C. (from Pakistan Journal of Agricultural Sciences 2010 Vol. 47 No. 4 pp. 317-319)
Allium akaka

A

Sow @ 20°C. Seed germinates within 3 months.
Allium alataviense

?

We have incomplete information on the germination of this species. Sometimes we offer an educated guess about which approach you could try. Let us know what is successful.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium altaicum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium altissimum

K

Sow @ 10°C. Most species for which we suggest this temperature will also germinate at 20°C, but prefer the cooler temperature for sturdy growth.
Allium amabile

J

Sow @4°C for 3 weeks, then place @20°C.
Allium amphibolum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium angulosum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium atropurpureum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium azureum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium backhausianum

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium barsczewskii

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium beesianum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium caeruleum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium carinatum

F

Sow @ 4°C.
Allium carinatum ssp. pulchellum

F

Sow @ 4°C.
Allium carinatum ssp. pulchellum f. album

F

Sow @ 4°C.
Allium carolinianum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium cernuum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium cernuum 'Graton'

A

Sow @ 20°C. Seed germinates within 3 months.
Allium cernuum 'Leo'

A

Sow @ 20°C. Seed germinates within 3 months.
Allium cernuum f. alba

A

Sow @ 20°C. Seed germinates within 3 months.
Allium cernuum ssp.obtusum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium chrysanthum

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium cristophii

J

Sow @4°C for 3 weeks, then place @20°C.
Allium cyaneum

F

Sow @ 4°C.
Allium cyathophorum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium cyathophorum v. farreri

J

Sow @4°C for 3 weeks, then place @20°C.
Allium farreri

J

Sow @4°C for 3 weeks, then place @20°C.
Allium fistulosum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium flavum

A

Sow @ 20°C. Seed germinates within 3 months.
Allium flavum 'Blue Leaf'

J

Sow @4°C for 3 weeks, then place @20°C.
Allium flavum 'Minor'

J

Sow @4°C for 3 weeks, then place @20°C.
Allium flavum ssp. tauricum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium flavum v. minus

J

Sow @4°C for 3 weeks, then place @20°C.
Allium flavum var. tauricum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium forrestii

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Allium geyeri

A

Sow @ 20°C. Seed germinates within 3 months.

2

Requires darkness.
Allium giganteum

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Allium gooddingii

A

Sow @ 20°C. Seed germinates within 3 months.

2

Requires darkness.
Allium grayi

A

Sow @ 20°C. Seed germinates within 3 months.
Allium gultschense

J

Sow @4°C for 3 weeks, then place @20°C.
Allium gunibicum

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium hirtifolium

6

Requires scarification. Nick or rub between sheets of sandpaper.  See https://youtu.be/icB9HrqdQqU  Seed coat of Baptisia and Oxytropis and other Fabaceae can be scarified by soaking in boiling water. See http://botanicallyinclined.org/continuing-the-sowing-in-hot-water

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
scarify one year old seeds with sulfuric acid for 15 min, and stratify at 4°C. (from Pakistan Journal of Agricultural Sciences 2010 Vol. 47 No. 4 pp. 317-319)
Allium hollandicum

F

Sow @ 4°C.
Allium hollandicum 'Purple Sensation'

F

Sow @ 4°C.
Allium hyalinum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium hybrid

?

We have incomplete information on the germination of this species. Sometimes we offer an educated guess about which approach you could try. Let us know what is successful.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Allium insubricum

J

Sow @4°C for 3 weeks, then place @20°C.
Allium jesdianum

E

Sow @ 20°C for 6 weeks, then place @ 4°C for 6 weeks, then slowly raise temperature to 10°C for 6 weeks. If there is no germination, repeat the cycle. This mimics fall sowing outdoors for spring germination.
Allium kansuense

A

Sow @ 20°C. Seed germinates within 3 months.
Allium karataviense

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
store seed @ 4°C; seed stored @ 20°C takes 6-9 months to germinate
Allium karataviense 'Ivory Queen'

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
store seed @ 4°C; seed stored @ 20°C takes 6-9 months to germinate