Handbook of Plant and Crop Physiology

104 CHONG ET AL.

Pseudotsuga menziesii

Douglas firPinaceae

Pyrus communis

PearRosaceae

Quercus

spp.

Q. alba

(W)

White oak

Q. bicolor

Swamp white oak (W)

Q. coccinea

(B)

Scarlet oak

Q. imbricaria

(B)

Shingle oak

Q. macrocarpa

(W)

Bur oak

Q. muhlenbergii

(W)

Chinkapin oak

Q. nigr

a (B)

Water oak

Q. palustris

(B)

Pin oak

ET DT DTDT DT DT DT DT DT DT DT

Aug.–Sept. July–Oct. Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.Aug.–Dec.

3–4 months

stored as conesdry and warm;10–20 years at 0 

C and 6–9%

moisturecontent

2–3 years at

1–5°C and10% moisturecontent

6 months or less

for Black Oakgroup. WhiteOak group hasalmost nostoragecapabilities.

(^1) 3–4
NoneNone1–2 1–2 0–2 None1–2 1–2
Collect seeds when golden
brown in color. Fallsowing not recommendedas germination may begintoo early. No pretreatmentrequired, but if given, mayenhance germinationpercentage and rate.
Macerate fruit to extract
seed. Presoaking seed inwater for 24 hr mayimprove stratificationresults.
With few exceptions, acorns
of the White Oak (W)group have little or nodormancy and germinateimmedaitely afterdropping from the tree.
Acorns of the Black Oak (B)
group exhibit embryodormancy. Outdoor fallsow for germination thefollowing spring.
See note 4.
TABLE 3
Continued
Pretreatment
Stratification (months)
Plant
Collection
Warm
Cold
Species
type
date
Storage
Scarification
(20–30
C)
(1–5
C)
Remarks