Germination Guide

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

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 'Grand Blue'

A

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

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

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

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

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

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

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

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

!

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.

8

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

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

If not sown right away after collecting (late Aug.-Sept)the seeds need to be kept moist at all times to remain viable. 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

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

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

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

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
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 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 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...
Celsia acaulis

A

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

J

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

J

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

A

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

?

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.
Centaurea 'Black Ball'

A

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

A

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

2

Requires darkness.

6

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Centaurea cheiranthifolia v. purpurascens

A

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

A

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

N

Sow directly in garden.
Centaurea dealbata

A

Sow @ 20°C. Seed germinates within 3 months.
Centaurea drabifolia ssp. cappadocica

A

Sow @ 20°C. Seed germinates within 3 months.
Centaurea drabifolia v. drabifolia

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Centaurea hypoleuca 'John Coutts'

A

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

A

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