the time to plant outside. Or, as some prefer, they may be purchased for delivery 
a week or ten days before intended planting in the garden, gradually hardened to 
outside conditions and then set right into the garden as one would any other un- 
potted plant. This method requires a little more attention to details of conditioning 
the cuttings, but has the advantage of better and straighter roots when the clumps are 
dug the next fall. 
Pot Roots 
We are offering a limited number of "pot roots'’ of some of the varieties listed 
in the DAHLIA BLUE BOOK. These are entire clumps consisting of one or more 
roots, usually about the size of a walnut, grown in three inch flower pots. Perform- 
ance of pot roots is equally as good as from field grown roots. They are excellent 
planting stock, and are also suitable for propagation when only a few plants are 
wanted quickly. 
We suggest getting the pot roots at least a month before time to plant in the 
garden. When the roots are delivered, place them on moist soil, or cover lightly with 
loose soil or peat moss in a fairly warm place, where they can be protected from 
frosts. A cold frame is ideal for this. The roots will sorout and grow into fine plants 
by the time to plant in the garden, at which time they can be lifted and moved to 
their permanent spot in the garden without noticeable checking of growth. 
Pot roots have long been a favored dahlia planting stock in Europe and the 
practice is gaining rapidly here. Pot roots are especially recommended to those who 
fail to get satisfactory clumps from green plants. 
New. Insecticides 
Red Spider (see page 46) continued to be the most serious pest of dahlias 
during 1947, especially where DDT was used to control other pests. None of the 
newer materials have proven entirely satisfactory, altho proper use of them result in 
good control of red spider. 
Preliminary tests of a new product, as yet un-named but designated as No. 3422 
by the American Cynamid Co., has appeared to be an ideal, safe control for red 
spider. This product (aryl alkyl thionophosphate) also controls most of the pests 
controlled by DDT and others besides. Some entomologists believe it will almost 
entirely displace DDT. At present it appears to be the ‘'one shot" spray material 
for all dahlia pests. It will be thoroughly tested at Rocky River Dahlia Gardens in 
1948. 
Unfortunately, this mysterious new chemical may not be available for general 
use during the coming season. We mention it here, now, so that if it should be put 
on the market in time for use in 1948, our customers will be aware of it’s poten- 
tialities. If it should be available, by all means try it. 
A new product, sold under various trade names, but containing the active in- 
gredient ''chlordane’, has proven far superior to other materials for the control of 
grasshoppers and cucumber beetles, two serious pests of dahlias in some sections, 
not effectively controlled by DDT. (See page 46). 
Dahlia Seed 
We offer the finest seed available; from the same source, and varieties, which 
produced such outstanding varieties as Jane Lausche, Mrs. E. J., Windlassie, Black 
Monarch, Mrs. Hester A. Pape, and scores of other Honor Roll and Certificate of 
Merit dahlias. See page 41 for prices. 
