Germination Guide

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

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.
Crambe maritima

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.
Germination suggestions based on Facebook discussion with members.
Crambe orientalis

A

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

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.
Crassula species

A

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

A

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

A

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

A

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

*

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.
instead of nicking, seed can be scarified by soaking in 5% solution of sulfuric acid for 3 hours. CAUTION: THIS CAN BE A DANGEROUS PROCEDURE
Crataegus crus-galli

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.
Crataegus laevigata 'Paul's Scarlet'

D

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

G

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

Crataegus sp.

D

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

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

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.
instead of nicking, seed can be scarified by soaking in 5% solution of sulfuric acid for 3 hours. CAUTION: THIS CAN BE A DANGEROUS PROCEDURE
Crategus pinnatifida

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

D

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

A

Sow @ 20°C. Seed germinates within 3 months.
Crepis rubra 'Snow White'

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.
Crepis aurea

A

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

F

Sow @ 4°C.

*

This species needs special care as described.
poor germination
Crepis nana

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

Crepis rubra

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia 'Emily Mackenzie'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia 'Emberglow'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia 'John Boots'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia 'Lucifer'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia 'Walcroy'

A

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

A

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

!

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.
Crocosmia 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.
Crocosmia x crocosmiiflora

!

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.
Crocosmia x crocosmiiflora 'George Davison'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocosmia x crocosmiiflora 'Star of the East'

A

Sow @ 20°C. Seed germinates within 3 months.
Crocus serotinus subsp. salzmannii

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus serotinus subsp. salzmannii

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus 'Jeane d' Arc'

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus 'Princess Beatrix'

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus 'Striped Beauty'

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus angustifolius ' Minor'

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus banaticus

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus biflorus ssp. alexandri

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus boryi

!

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus byzantinus

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus flavus ssp. flavus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus fleischeri

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus herald

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus heuffelianus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus iridiflorus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus kotschyanus

!

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.
Crocus macedonicus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus minimus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus nudiflorus

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus pulchellus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus sativus var. cashmerianus

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus 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

*

This species needs special care as described.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus speciosus

C

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

*

This species needs special care as described.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus speciosus 'Conqueror'

C

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

*

This species needs special care as described.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus tommasinianus

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus vallicola

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.
best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Crocus vernus

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Cryptantha 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.

*

This species needs special care as described.
27°C
Cryptotaenia japonica f. atropurpurea

2

Requires darkness.

D

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