Germination Guide

Click on a species name below to see it's germination tips.
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Carex nigra

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.
Carex pendula

D

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

D

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

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

Carex scaposa

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.
Carex schiedeana

?

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.

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.
Carex sp.

*

This species needs special care as described.
NA and European species J, New Zealand K
Carex stellata

?

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.

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.
Carex viridula ssp. viridula

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

Carlina acanthifolia

B

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

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...
Carlina acaulis ssp. acaulis

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...
Carlina acaulis ssp. simplex

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...
Carlina caulescens

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.
Carlina corymbosa

A

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

D

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

C

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

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.
plant 1-2 seeds in deep pot
Caryopteris x clandonensis 'Worchester Gold'

A

Sow @ 20°C. Seed germinates within 3 months.
Caryopteris 'Grand Blue'

A

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

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

Caryopteris x clandonensis

A

Sow @ 20°C. Seed germinates within 3 months.
Caryopteris x clandonensis 'Heavenly Blue'

A

Sow @ 20°C. Seed germinates within 3 months.
Caryopteris x clandonensis 'Kew Blue'

A

Sow @ 20°C. Seed germinates within 3 months.
Caryopteris × clandonensis 'Inoveris' Grand Bleu

A

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

A

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

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
Cassia fasciculata

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

J

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

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

H

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

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
Cassia 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.

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

A

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

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

G

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

G

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

C

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

*

This species needs special care as described.
remove seed coat, plant together with Penstemon strictus as host in sterile soil
Catalpa bignonioides

A

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

J

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

A

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

A

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

A

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

*

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.

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

Hydrophilic; If not sown right away after collecting (late Aug.-Sept)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. They will start to germinate after at least two cycles of cold/warm (in the second year after sowing).
Cautleya spicata

!

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.
Ceanothus 'Owlswood Blue'
Ceanothus americanus

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

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

*

This species needs special care as described.
remove stiff husk
Ceanothus sp.

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

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
Cedrus deodara

G

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

*

This species needs special care as described.
try washing with detergent; A
Celmisia gracilenta

A

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

!

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.
Celmisia sp.

!

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.

*

This species needs special care as described.
50% of seed is not viable, seedlings very susceptible to damping off
Celmisia traversii

!

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.

F

Sow @ 4°C.
Celosia 'New Look'

A

Sow @ 20°C. Seed germinates within 3 months.
Celosia argentea v. cristata (Plumosa Group)

A

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

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Celosia argentea 'Flamingo Feather'

A

Sow @ 20°C. Seed germinates within 3 months.
Celosia cristata 'Bombay Dark Red'

A

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

A

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

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...