Germination Guide

Click on a species name below to see it's germination tips.
Search for a genus or species by entering specific words or parts of words.
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Gagea pauciflora

?

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.
Gaillardia 'Arizona Sun'

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora 'Kobold'

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia 'Goblin'

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia 'Royal Monarch Red'

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia aristata 'Amber Wheels'

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia pulchella 'Red Plume'

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora 'Burgunder'

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora 'Mesa Yellow'

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora (Gallo Series)

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia x grandiflora ex 'Goblin'

A

Sow @ 20°C. Seed germinates within 3 months.
Gaillardia × grandiflora 'Kobold'

A

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

?

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.

*

This species needs special care as described.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
ephemeral, grow seedlings at cool temperature - best achieved by sowing in open ground
Galanthus plicatus

?

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.

*

This species needs special care as described.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
grow seedlings at cool temperature - best achieved by sowing in open ground
Galanthus caucasicus

*

This species needs special care as described.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.

L

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

N

Sow directly in garden.
http://www.galanthus.co.uk/cultivation_categories.php?cultID=13; also follow this discussion http://www.srgc.net/forum/index.php?PHPSESSID=tlrnf8dqug77vstnl3gvqpnnh7&topic=11117.0
Galanthus elwesii

*

This species needs special care as described.

L

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

N

Sow directly in garden.
http://www.galanthus.co.uk/cultivation_categories.php?cultID=13; also follow this discussion http://www.srgc.net/forum/index.php?PHPSESSID=tlrnf8dqug77vstnl3gvqpnnh7&topic=11117.0
Galanthus ikariae

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.

N

Sow directly in garden.
http://www.galanthus.co.uk/cultivation_categories.php?cultID=13; also follow this discussion http://www.srgc.net/forum/index.php?PHPSESSID=tlrnf8dqug77vstnl3gvqpnnh7&topic=11117.0
Galanthus woronowii

*

This species needs special care as described.

L

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

N

Sow directly in garden.
http://www.galanthus.co.uk/cultivation_categories.php?cultID=13; also follow this discussion http://www.srgc.net/forum/index.php?PHPSESSID=tlrnf8dqug77vstnl3gvqpnnh7&topic=11117.0
Galax urceolata

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.
Galega officinalis

A

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

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
grow on @ 10°C
Galega orientalis

A

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

L

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

Or after about 3 months at 20 deg, put them into 4 deg for 6 months. They sprout in the cold.
Galeopsis speciosa

G

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

2

Requires darkness.
Galium glaucum

L

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

Galium odoratum

A

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

!

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.

*

This species needs special care as described.
outdoors in autumn
Galtonia candicans

!

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.

A

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

2

Requires darkness.
Galtonia viridiflora

B

Sow @ 20°C. If seed does not germinate within 3 months, try 4°C for 1-2 months, then 20°C again.
Gaultheria adenothrix

*

This species needs special care as described.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

8

Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water daily for approximately 7 days. Discard water.

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
peat based medium, prone to damping off
Gaultheria fragrantissima

*

This species needs special care as described.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

8

Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water daily for approximately 7 days. Discard water.

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
peat based medium, prone to damping off
Gaultheria procumbens

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

8

Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water daily for approximately 7 days. Discard water.

A

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

A

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

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Gaultheria sp.

*

This species needs special care as described.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

8

Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water daily for approximately 7 days. Discard water.

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
peat-based medium, prone to damping off
Gaura sp

?

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.

2

Requires darkness.

A

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

2

Requires darkness.

A

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

C

Sow @ 20°C for 3 months, then place @ 4°C for 3 months.
Gazania 'Kiss Frosty White Flame'

A

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

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.

2

Requires darkness.

*

This species needs special care as described.
grow cool
Gazania linearis

A

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

A

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

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista dalmatica

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista hispanica ssp. occidentalis

G

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Genista horrida

A

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista michelii

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista pilosa 'Vancouver Gold'

L

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Genista procumbens

*

This species needs special care as described.

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

A

Sow @ 20°C. Seed germinates within 3 months.
soak in HOT water
Genista sagittalis

A

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Genista sagittalis ssp. delphinensis

A

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Genista subcapitata

L

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Genista sylvestris

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista sylvestris v. pungens

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

*

This species needs special care as described.
soak in hot water
Genista tinctoria

A

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ
Gentiana angustifolia ex 'Iceberg'

*

This species needs special care as described.

C

Sow @ 20°C for 3 months, then place @ 4°C for 3 months.
avoid pricking out individually, transplant seedlings in clumps