Handbook of Plant and Crop Physiology

94 CHONG ET AL.

TABLE 3

Continued

Pretreatment

Stratification (months)

Plant

Collection

Warm

Cold

Species

type

date

Storage

Scarification

(20–30

C)

(1–5

C)

Remarks

Betula nigraB. papyriferaB. lentaB. pendula

BirchBetulaceae

Carpinus betulusC. caroliniana

HornbeanBetulaceae

Carya glabra

Pignut

C. illinoensis

Pecan

C. ovata

Hickory

C. tomentosa

MockernutJuglandaceae

DTDTDTDT DTDT DT DT DT DT

May–JuneAug.–Sept.Aug.–Sept.July–Aug. Sept. Sept.–Dec.

1.5–2 years at

room temp. ifdried to 1–3%moisturecontent

1 

years at1–5

C and

10% moisturecontent

3–5 years at 5

C

and 3–5%moisturecontent

1–2 days soak in

H

O at 20–25 2



Fresh none

Dried 2

None1–21–2

1

Fresh 3–4Dried 2–4

2–4 2–4 2–4 2–4

Collect seeds while still

green to avoid scatteringby wind. Seeds are smalland thin-coated, tend tolose viability quickly.Long-day photoperiodduring germinationeliminates need forstratification.

Fall-sow fresh outdoors to

germinate the followingspring. Viability may below; test by soaking 6 hrin water and sowing onlythose which sink.

Sow freshly harvested nuts

immediately, or after 1–2days of soaking at roomtemp.; germination may beerratic. Alternatingday/night temps. of30/20

C may aid

germination.