ONTARIO ROCK GARDEN SOCIETY

Germination guide

Genus

Species

Germination

Remarks

Corallodiscus

sp.

.

.

Coreopsis

grandiflora

A

Coreopsis

sp.

K

Coreopsis

verticillata

K

Coriandrum

sativum

A N 1

Cornus

alternifolia

! L *

wash and rinse daily in clean water for 14 days to remove pulp

Cornus

canadensis

G 5 8 *

ditto

Cornus

florida

H 2 8 *

ditto

Cornus

kousa

H 8 *

ditto

Cornus

stolonifera

D *

ditto

Coronilla

minima

J 6 7

.

Coronilla

vaginalis

J 6 7

Cortusa

altaica

.

Cortusa

matthioli

A

Cortusa

matthioli 'Alba'

A

Cortusa

matthioli ssp. turkestanica

A

Cortusa

matthioli v. pekinensis

A

Cortusa

turkestanica

A

Corydalis

alba

! 3 *

4° C x 2w then 10° C

Corydalis

aurea

! L

.

Corydalis

bulbosa 'Albiflora'

! 3 *

4° C x 2w then 10° C

Corydalis

cava

! D

.

Corydalis

cheilanthifolia

! C

seed destroyed by dry storage for 6 m, 4° C x 2w then 10° C

Corydalis

densiflora

! 3 *

4° C x 2w then 10° C

Corydalis

flexuosa

! L

.

Corydalis

lutea

! C *

seed destroyed by dry storage
 for 6 m,4° C x 2w then 10° C

Corydalis

nobilis

! L *

seeds do not tolerate dry storage, place in moist towels in June, need oscillating temps of both fall and spring to germinate

Corydalis

ochroleuca

! E *

repeat cycle if seed does not germinate

Corydalis

parnassica

! 3 *

4° C x 2w then 10° C

Corydalis

saxicola

! L

.

Corydalis

scouleri

! 3 *

4° C x 2w then 10° C

Corydalis

sempervirens

! A 3

.

Corydalis

solida

! E *

allow to remain in same pot for 1st year

Corydalis

solida f. transsylvanica 'George Baker'

! E *

ditto

Corydalis

sp.

! L

.

Corylopsis

glabrescens

D

difficult

Cosmos

bipinnatus

A

.

Cosmos

sulphureus 'Cosmic Orange'

A

Cotoneaster

horizontalis

F 7

Cotoneaster

integerrimus

*

20° C x 6m then 4° C x3m,
Scarify with sulphuric acid;
 THIS CAN BE A DANGEROUS PROCEDURE

Cotyledon

orbiculata

A

.

Crambe

abyssinica

L N

Crambe

cordifolia

A 3

Crambe

maritima

F

Crepis

aurea

A

Crepis

incana

F *

poor germination

Crepis

rubra

A

.

Crocosmia

x crocosmiiflora

! A

Crocosmia

'Lucifer'

A

Crocosmia

paniculata

! A

Crocosmia

sp.

K

Crocus

flavus ssp. flavus

*

grow seedlings @ 4° C, leave in pot for 2 years before planting out

Crocus

herald

*

ditto

Crocus

'Striped Beauty'

*

ditto

Crocus

Princess Beatrix'

*

ditto

Crocus

boryi

! L *

ditto

Crocus

heuffelianus

*

ditto

Crocus

kotschyanus

! A

ditto

Crocus

macedonicus

*

ditto

Crocus

pulchellus

L *

ditto

Crocus

speciosus

C *

ditto

Crocus

vernus

! E *

ditto