NEWS LETTER 

MANINGSEED COLLECTION REGIONS 
BULLETIN No. 1 In the DOUGLAS-FIR FORESTS 
Of OREGON and WASHINGTON 
The most important factors to observe in locating the correct seed sources 
for coniferous tree seeds are (1) average annual temperature, (2) minimum tempera- 
ture, (3) rainfall, particularly during the growing season, and (l) general 
moisture conditions of the atmosphere. 
In ordering "Bonded MANINGSEED", altitude and other topographic features 7 
should be taken into consideration as they affect climate, and within each region 
there may be specific soil conditions that will require consideration by the cus- 
tomer. The Douglas Fir region has dry summers; therefore, a seed source with a 
greater annual rainfall can be selected for planting at locations that have heavy 
rainfall during the growing season. 
There are approximately eight degrees difference in the spread of average 
annual temperature between Canada and California in the Douglas-Fir region. There 
are also three specific climatic belts, namely: 
(A) The so-called "fog belt" between the Coast Range and the sea on the 
Oregon and Washington coast; 
(B) The drier interior valleys between the Coast Range and the middle 
elevation of the Cascades that extend from Puget Sound (Washington) 
south to the Siskiyou Mountains (Oregon), and 
(C) A smaller area in the rain shadow of the Olympic Mountains (Washington) 
that includes a strip along the northeast end of the Olympic Peninsula, 
the eastern shore of Vancouver Island (British Columbia) and the Puget 
Sound Islands that lie to the east. 
The fog belt zone and the dry interior valley zone as shown on MANNING 
SEED COMPANY maps have been broken down into separate regions that vary from 2 to 
3 degrees in average annual temperature and vary also in minimum temperature and 
rainfall. They are as follows: 
REGION 1 
The cold, moist zone on the northwestern tip of the Olympic Peninsula 
that is characterized by low maximum and high minimum temperatures. Its average 
annual temperature is from 7° to 9° and has a minimum of +7° F. The rainfall 
averages from 80 to 123 inches per year. 
REGION 2 
~ Cool, moist zone of the fog belt that extends south to include the mouth 
of the Columbia River. The average annual temperature in this zone varies from 
49° to 51° with a ++); minimum and a rainfall of 60 to 126 inches. 

REGION 3 
The warm coastal zone that extends south to the Siuslaw River. Average 
annual temperature in this locality varies from 51° to 52° but has a minimum that 
drops to zero. The rainfall varies from 60 to 94 inches. 
