Handbook of Plant and Crop Physiology

GERMINATION AND EMERGENCE 79

Stratify 20

C 8–10

wk, then 2–5

C

8–10 wk, mayneed to repeatonce

Stratify 3–5

C 6 wk

Scarify in H

SO 2

(^304)
min or soak inwater 48 hr
14–21 7–10 7–14 14–21 30–60 21–50 10–12 7–10 10–18 14–20 15–20
Helianthus annuus
SunflowerAsteraceae
Helichrysum bracteatum
StrawflowerAsteraceae
Heliopsis
spp.
HeliopsisAsteraceae
Heliotropium arborescens
Garden heliotropeBoraginaceae
Helleborus
spp.
HelleboreRanunculaceae
Hemerocallis
spp.
DaylilyLiliaceae
Herniaria glabra
Rupture wortIllecebraceae
Hesperis matronalis
Dame’s rocketBrassicaceae
Heuchera sanguinea
Coral bells, AlumrootSaxifragaceae
Hibiscus trionum
MallowMalvaceae
Hosta
spp.
Plantain lilyLiliaceae
A A P A P P P P-W P A P
20–30
24 20
21–24 20–23 15–22
21
21–24 8–21
21 21
15–20
16
10–12 16–18 5–10 10–12 10–15
(^101010) 5–15
D or L
L L L L D
Seeds best sown directly in
garden because they growlarge and rapidly.
Reduce night temp. of
medium by 3
C for best
germination.
Reduce night temp. of
medium by 3
C for best
germination.
Hard seed coat may require
scarification.
continues