THE ROCKY MOUNTAIN SEED CO. 
DENVER, COLO 
13 
Lettuce 
(Lattuga, Lechuga, Lattich, Kopfsalat) 
CULTURE!—One ounce will sow 150 feet of drill, two pounds an 
acre. Lettuce is a hardy plant and will stand a low degree of tem¬ 
perature; however, a moderate temperature is desirable during the 
growing period. Lettuce stands cold much better than heat, making 
it impossible to produce lettuce of good quality during the hot 
summer months. Hot weather causes the plants to go to seed 
instead of heading. 
Lettuce requires considerable soil moisture; however, an excess 
of moisture may cause stem rot. A light, loamy soil, enriched with 
well-rotted manure, is best adapted for the successful growing of 
lettuce. If planted on poor soil the heads will be small and leaves 
tough. 
As soon as the ground can be satisfactorily worked, sow in drills 
15 to 20 inches apart, one-half to one inch deep, thin the plants 
8 to 15 inches apart in the row. Large headed varieties, like New 
York Wonderful or Iceberg, thin to 15 inches in the row. 
NEW YORK or WONDERFUL—Commonly called 
Iceberg by the produce trade. A large curled head¬ 
ing lettuce, with dark green leaves. Heads are well 
blanched, sweet, tender, crisp and of excellent 
quality. 
Postpaid (Pkt. 5c) (Oz. 20c) (% lb. 50c) (lb. $1.75) 
(5 lbs. $8.25). 
Imperial No. 847 
DENVER MARKET—^Heads medium sized, conical, 
crisp, of good quality. Leaves light green, much 
crumpled and coarsely fringed on the edges. 
Postpaid (Pkt. 5c) (Oz. 15c) (% lb. 35c) (lb. $1.25). 
NEW YORK No. 12^—A widely used strain of New 
York, well adapted to mid-season maturity, as it 
stands heat well. Plant and head lighter green 
than New York, with fewer outer leaves, several 
days earlier; large, compact and attractive. 
Postpaid (Pkt. 5c) (Oz. 20c) (% lb. 50c) (lb. $1.75) 
(5 lbs. $8.25). 
NEW YORK No. 12 (Special)—Selected for earliness 
and heat resistance. 
Postpaid (Pkt. 10c) (Oz. 25c) (% lb. 75c) (lb. $2.25) 
(5 lbs. $10.00). 
NEW YORK No. 515—A Pieters-Wheeler introduc¬ 
tion, bred as a summer variety to resist Tip-burn. 
A cross between Iceberg and New York resembling 
No, 12, has a better fold, is more sure heading and 
more resistant to Tip-burn. 
Postpaid (Pkt. 10c) (Oz. 25c) (% lb. 70c) (lb. $2.25) 
(5 lbs. $10.00). 
SPECIAL STRAINS OP NEW YORK No. 515—Spe¬ 
cial Strains are bred from single lilant selection, 
highly resistant to Tip-burn. 
No. lOO—An improved strain, larger, darker green 
and has a better base structure. An ideal sum- 
m6r l6ttuc6. 
Postpaid (Pkt. 10c) (Oz. 25c) (% lb. 75c) (lb. $2.25) 
(5 lbs. $10.00). 
No. 415—Produces fine quality well shaped solid 
heads, during the warmer weather. 
Postpaid (Pkt. 10c) (Oz. 25c) (% lb. 75c) (lb. $2.50) 
(5 lbs. $11.25). 
TRIPLE XXX—The best of the No. 515 types, highly 
resistant to Tip-burn. 
Post >aid (Pkt. 10c) (Oz. 25c) (% lb. 85c) (lb. $3.00) 
(5 lbs. $13.75). 
IMPERIAL No. 847—Resistant to brown blight. 
Heads hard and fine. Best for early spring and 
late fall crop. Black seed. 
Postpaid (Pkt. 10c) (Oz. 25c) (%, lb. 85c) (lb. $3.00) 
(5 lbs. .$13.75). 
IMPERIAL No. 815—Black Seeded identical with No. 
847, for which see description. 
Postpaid (Pkt. 10c) (Oz. 25c) (% lb. 85c) (lb. $3.00) 
(5 lbs. $1.3.75). 
IMPERIAL No. 615—Bred from Imperial No. 152 but 
somewhat later; resistant to brown blight; does not 
develop suckers. Heads medium large, solid and 
firm. Best for fall crop. 
Postpaid (Pkt. 10c) (Oz. 20c) (% lb. 7.5c) (lb. .$2.25) 
(5 lbs. $10.00). 
IMPERIAL No. 1.52—Resistant to brown blight, 
adapted for fall crop. Dependable in heading, 
heads medium large, solid and attractive. 
Postpaid (Pkt. 10c) (Oz. 20c) (% lb. 75c) (lb. $2.25) 
(5 lbs. $10.00). 
BIG BOSTON—Heads of medium size; compact with 
creamy yellow heart. Leaves smooth, glossy, 
slightly tinged with reddish brown. 
Postpaid (Pkt. 5c) (Oz. 15c) lb. 35c) (lb. $1.25). 
IMPROVED HANSON—Large, compact head with yel¬ 
lowish-green leaves, curly with fringed edge. 
Good for mid-summer planting. 
Postpaid (Pkt. 5c) (Oz. 15c) (% lb. 35c) (lb. $1.25). 
PARIS WHITE COS or ROMAINE—Large size, and 
medium green, compact head,, well blanched. For 
home and market, and well adapted for greenhouse 
use. 
Postpaid (Pkt. 5c) (Oz. 15c) (% lb. 35c) (lb. $1.60) 
(5 lbs. $4.50). 
Leaf Lettuce 
EARLY CURLED SIMPSON or SILECIA—A fine 
home garden sort, with light green frilled leaves. 
Postpaid (Pkt. 5c) (Oz. 15c) (% lb. 35c) (lb. $1.00) 
(5 lbs. $4.50). 
BLACK SEEDED SIMPSON—An early loose leaved 
type, with yellowish-green frilled leaves. 
Postpaid (Pkt. 5c) (Oz. 15e) (^A U*. 35c) (lb. $1.00) 
(5 lbs. $4.50). 
GRAND RAPIDS—One of the most popular sorts, for 
forcing or out-of-door use. Plants compact with 
light green frilled leaves. Tip-burn resistant. 
Postpaid (Pkt. 5c) (Oz, 15c) (% lb. 35c) (lb. $1.25). 
PRIZEHEAD'—^An early non-heading sort, leaves 
dark green edged with brown and highly frilled. 
Postpaid (Pkt. ,5c) Oz. 15c) (% lb. 35c) (lb. $1.00) 
(5 lbs. .$4.50). 
CHICKEN LETTUCE—Tall growing variety produc¬ 
ing many leaves, for chicken and rabbit feeding. 
Postpaid (Pkt. 5c) (Oz. 15c) (^A 1*>. 35c) (lb. $1.00) 
(5 lbs. ,$4.50). 
SEED TREATMENT 
FOR SEED BORNE DISEASES—Treat all Seeds with 
Curpocide or Semesan. 
FOR INSECT CONTROL—Use Dry Pyrocide Dust for 
controlling Aphis and the Cabbage Looper. Dry Pyrocide 
is a stabilized, non-poisonous pyrethrum product. 
FERTILIZERS—As a side dressing use Triple Super¬ 
phosphate at the rate of 150 to 200 lbs. per acre to 
hasten maturity and increase yield. 
