EXPLANATION OF HARDINESS RATINGS 
As this list goes all over the U. S. A. and also abroad, 
we believe it a good idea to indicate hardiness. This has 
been done by giving after the name of each item a num- 
ber in ( ) indicating the zone up to which it is considered 
hardy. 
Our authority through Zone 7 is Rehder’s Handbook. 
For Zones 8 to 10 we have been guided by Pacific Coast 
experience and have subdivided Zone 9 so that 
(9) indicates probably safe to 20° (Sacramento and 
San Joaquin Valleys, etc.). 
(942) indicates probably safe to 25° or 26° (San Fran- 
cisco Bay Region,. etc.). 
(10) indicates will stand only very light frost. 
To find the zone you are in refer to map on center 
pages of this book, which we use by the courtesy of 
Arnold Arboretum and McGraw-Hill Book Co. 
We hope this innovation will be helpful to nurserymen 
all over the country. Please understand that ratings show 
our honest opinion, but we disclaim all responsibility for 
their correctness. 
ABBREVIATIONS— 
A. M. R. H. S.—Given an Award of Merit by Royal 
Horticultural Society of England. 
F.C. C. R. H. S. indicates their First Class Certificate, 
which is a distinction rarely conferred. 
A. M. C. H. S.—Given an Award of Merit by California 
Horticultural Society. 
_ H.C.C. refers to the Horticultural Color Chart now 
coming into wide use. The exact color tone will be 
found at point shown. 
LINING OUT STOCK— 
For convenience, this is assembled on page 23. The 
list includes several new and uncommon items not 
available elsewhere, so deserves careful scrutiny. 
POT GROWN AND GALLON CAN STOCK— 
We find that many customers, especially those at a 
distance, prefer to have us remove soil and ship “bare 
roots” packed in moss. If you order any of this class of 
material please be sure to say whether you want it 
packed with or without soil on the roots. 
California nurserymen will please note that 4-in. pot 
+ stock in body of list can usually be transferred at once 
to gallon cans for immediate sale, while the smaller 
sizes for growing on, together with 2% and 3-in. pot 
stock, can be found at the end of list. 
It seems too bad to have to issue such a short list 
again but nearly everyone knows that demand for 
good ornamental stock still so far, exceeds supply that 
many lines are being ordered a year ahead and at 
“open price.’ We already have quite a number of 
orders booked for season 1948-49. 
With increased facilities and area mentioned last 
year we hope that it will not be many seasons before 
we take care of the demand for the lines in which we 
specialize. 
W. B. CLARKE & CO. 
is a co-partnership 
composed of 
Walter B. Clarke 
Walter C. Borchers 
James F. Clarke 
