Handbook of Plant and Crop Physiology

74 CHONG ET AL.

Nick hard seed coat

or soak in water6–9 hr

Stratify 22

C 6–8

wk, then 0–2

C

6–8 wk

Sow, then freeze 4–8

hr or more

7–217–217–21^30 7–14 5–75–7 8–10 5–10 7–10 30–50 7–10 8–108–10

Coreopsis tinctoriaC. lanceolataC. verticillata

TickseedAsteraceae

Coronilla varia

Crown vetchFabaceae

Corydalis lutea

Yellow corydalisFumariaceae

Cosmos sulphureusC. bipinnatus

CosmosAsteraceae

Cuphea ignea

Cigar flowerLythraceae

Cynaglossum amabile

Chinese hound’s tongueBoraginaceae

Dahlia

hybrids

DahliaAsteraceae

Datura meteloides

Angel’s trumpetSolanaceae

Delphinium

spp.

DelphiniumRanunculaceae

Dianthus chinensisD. plumarius

AP-WP P P AA A B A A P P P

20–2420–2420–24 21–23 22–25

2424 21

18–23 21–24 21–26 Day 27Night 21

2121

101010 1818

13–16 15–20 7–10 10–1310–13

L LL

D or L D or LD or L

L D

D or L

L D

D or LD or L

Reduce night temp. of

medium by 3

C for best

germination.

Plants self-sow easily. Seed

must be sown fresh.Vitality decreases rapidlywith age.

Germination may be slow and

erratic.

Use fresh seed. Viability

decreases rapidly with age.Alternate day and nighttemp. as noted.

TABLE 2

Continued

Medium temperature (

C)

Plant

Posttransplant

Days to

Light or

Species

type

Germination

(night)

germinate

dark

Pretreatment

Remarks