Handbook of Plant and Crop Physiology

GERMINATION AND EMERGENCE 87

Stratify 2–5°C 3–4

wk

Nick seed coat or

soak in warmwater 24 hr

16–24 30–40 6–8 wk17–20 5–10 15–20 7–10 12–15 10–14

Primula

spp.

PrimrosePrimulaceae

Pulsatilla vulgaris

Pasque flowerRanunculaceae

Ranunculus

spp.

ButtercupRanunculaceae

Ratibida columnifera

ConeflowerAsteraceae

Reseda odorata

MignonetteResedaceae

Racinis communis

Castor bean plantEuphorbiaceae

Rodgersia

spp.

Rodgers flowerSaxifragaceae

Rudbeckia hirta

Cone flower,Gloriosa daisyAsteraceae

Salpiglossis sinuata

Painted tongueSolanaceae

Salvia

spp.

SageLamiaceae

P P P
P-W A A

P

P-W A A

16–18 20–23 15–16 20–24

21

21–24 21–23 21–24 21–24 21–24

3 wk at 13,then 5–7

10–12 10–12

13 15

15–18 10–15

16

10–13

16

L
D or L

L D

D or L

L D L

Reduce posttransplant temp

gradually. Sow seeds assoon as they ripen toenhance germination.

Seed must be fresh or

dormancy occurs.

Fresh seed can be sown

immediately.

Reduce night temp. of

medium by 3

C for best

germination.

Difficult to transplant. Best

sown directly to garden orcontainer.

Seeds are tiny. Do not cover.Reduce night temp. of

medium by 3

C for best

germination.

Seeds are very small. Do not

cover. Place in dark togerminate.

Seeds need light for only 48

hr, then can be covered.Reduce night temp. ofmedium by 3°C for bestgermination. Harden offseedlings at 13°C for 3–4days before transplanting.Keep salt levels low intransplant medium.

continues