Handbook of Plant and Crop Physiology

86 CHONG ET AL.

TABLE 2

Continued

Medium temperature (

C)

Plant

Posttransplant

Days to

Light or

Species

type

Germination

(night)

germinate

dark

Pretreatment

Remarks

Stratify 5

C 4–6 wk

Stratify 5

C 6 wk

10–20 12–24 12–24 14–21 7–14 10–20 20–25 21–28 7–10 15–20

Phuopsis stylosa

CrosswortRubiaceae

Physalis alkekengi

Chinese lanternSolanaceae

Physostegia virginica

Obedient plantLamiaceae

Platycodon grandiflorus

Balloon flowerCampanulaceae

Plumbago auriculata

LeadwortPlumbaginaceae

Polemonium

spp.

Jacob’s ladderPolemoniaceae

Polygonatum

spp.

Solomon’s sealLiliaceae

Polygonum

spp.

Smart knotweedPolygonaceae

Portulaca grandiflora

Rose mossPortulacaceae

Potentilla

spp.

CinquefoilRosaceae

P P

P-W

P P P

P-W

P A P

20–24 21–24 Day 24Night 1318–22 20–24 20–24 20–23

21

21–24

21

15–18

18 10

10–15 15–18

13

15–18

18

16–18 10–12

D or L

L

D or L

L

D or L D or L D or L

L

D or L

Germination may be slow—

up to 6 months.

Alternate day and nigh temp.

as noted.

Reduce night temp. of

medium by 3

C for best

germination.

Germination may be erratic.Reduce night temp. of

medium by 3

C for best

germination. Seed can bedirectly sown to garden orcontainer.

Seeds lose viability quickly

and should not be stored.