Germination Guide

Click on a species name below to see it's germination tips.
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Convallaria majalis 'Albostriata'

2

Requires darkness.

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.
Convallaria majalis 'Variegata'

A

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

2

Requires darkness.

8

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

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

8

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

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.
Convolvulus tricolor

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.
Convolvulus assyricus

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
Coprosma petriei

H

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

*

This species needs special care as described.

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.
hydrophilic, sow as soon as seed is ripe; If not sown right away after collecting the seeds need to be kept moist at all times to remain viable. For storage put in plastic bag with barely damp vermiculite; keep them warm during summer, coolish towards the fall and then 4⁰C at the onset of winter. Do not store them in the freezer because the formation of ice crystals will damage cell membranes; prechill x 4 weeks, peat based medium
Coptis trifolia

*

This species needs special care as described.

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.
hydrophilic, sow as soon as seed is ripe; If not sown right away after collecting the seeds need to be kept moist at all times to remain viable. For storage put in plastic bag with barely damp vermiculite; keep them warm during summer, coolish towards the fall and then 4⁰C at the onset of winter. Do not store them in the freezer because the formation of ice crystals will damage cell membranes; plant in peat based medium
Coptis trifolia ssp.groenlandica

*

This species needs special care as described.

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.
hydrophilic, sow as soon as seed is ripe; If not sown right away after collecting the seeds need to be kept moist at all times to remain viable. For storage put in plastic bag with barely damp vermiculite; keep them warm during summer, coolish towards the fall and then 4⁰C at the onset of winter. Do not store them in the freezer because the formation of ice crystals will damage cell membranes; prechill x 4 weeks, peat based medium
Corallodiscus 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.

A

Sow @ 20°C. Seed germinates within 3 months.
Coreopsis 'Cosmic Eye'

A

Sow @ 20°C. Seed germinates within 3 months.
Coreopsis rosea 'American Dream'

F

Sow @ 4°C.
Coreopsis tinctoria

3

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

A

Sow @ 20°C. Seed germinates within 3 months.
Coreopsis verticillata 'Moonbeam'

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.
Coreopsis auriculata 'Nana'

A

Sow @ 20°C. Seed germinates within 3 months.
Coreopsis auriculata ‘Zamphir'

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Coreopsis grandiflora 'Early Sunrise'

A

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

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.
Coreopsis lanceolata

A

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

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...
Coreopsis rosea

F

Sow @ 4°C.
Coreopsis sp.

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.
Coreopsis tripteris

B

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

3

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

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.
Coriandrum sativum 'Calypso'

A

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

A

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

N

Sow directly in garden.

1

Resents transplanting.
Cornus kousa 'Wolf Eyes'

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus rugosa

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus rugosa f. variegata

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus alternifolia

!

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.

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

*

This species needs special care as described.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus canadensis

*

This species needs special care as described.

5

Germination is successful only when GA3 is used. See http://botanicallyinclined.org/fridays-seeds-with-the-ga3-seeds-treatment

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.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus capitata

!

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.

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

wash and rinse daily in clean water x 14 days to remove pulp
Cornus florida

*

This species needs special care as described.

2

Requires darkness.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus florida 'Rainbow'

*

This species needs special care as described.

2

Requires darkness.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus kousa

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus kousa 'Milky Way'

H

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

8

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

*

This species needs special care as described.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus kousa v. chinensis 'China Girl'

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus kousa v. chinensis 'Satomi'

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus mas

*

This species needs special care as described.

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.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus mas 'Variegata'

*

This species needs special care as described.

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.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus racemosa

*

This species needs special care as described.

8

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

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
wash and rinse daily in clean water x 14 days to remove pulp
Cornus sp.
seed viability < 1 year
Cornus stolonifera

D

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

*

This species needs special care as described.
wash and rinse daily in clean water x 14 days to remove pulp
Coronilla cappadocica

!

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.

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.

*

This species needs special care as described.
allow to remain in same pot for 1st year
Coronilla minima

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

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

J

Sow @4°C for 3 weeks, then place @20°C.
Coronilla orientalis

!

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.

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.

*

This species needs special care as described.
allow to remain in same pot for 1st year
Coronilla vaginalis

J

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

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

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
Cortaderia richardii

J

Sow @4°C for 3 weeks, then place @20°C.
Cortusa matthioli ssp. altaica

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Cortusa matthioli 'Alba'

A

Sow @ 20°C. Seed germinates within 3 months.
Cortusa matthioli ssp. pekinensis

A

Sow @ 20°C. Seed germinates within 3 months.
Cortusa matthioli ssp. turkestanica

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Corydalis solida ssp. densiflora

!

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.

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.
allow to remain in same pot for 1st year
Corydalis wilsonii

A

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

!

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.

3

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

*

This species needs special care as described.
4°C x 2 weeks then 10°C; germination impaired by dry storage