The Dandelion in Colorado 
23 
extended to 48 hours. Good care in the matter of irrigation and 
mowing the lawn should follow the spraying in order to encour¬ 
age the growth of grass. 
The iron sulphate spray causes a darkening of the lawn grass 
and may even kill a portion of the leaves in some cases. It was 
noted that where the ground was quite dry at the time of spray¬ 
ing the injury to the grass was much greater than where plenty 
of moisture was present. A good time to apply the spray is the 
day following rain or a 
thorough irrigation of 
the lawn. Under suit- 
able conditions the 
grass will recover in a 
week or ten days and 
will usually show a 
darker green color 
throughout the remain¬ 
der of the season than 
unsprayed lawns. 
The iron s u 1 p h a te 
treatment may be ex¬ 
pected to kill out most 
of the white clover in 
the lawn. In cases 
where the lawn consists 
largely of white clover 
it may appear that the 
spray has killed the 
grass, while in reality 
there may have been 
but little grass present 
at the start. Most lawns that are badly infested with dandelions 
are suie to have a poor stand of grass. In all such cases it is ad¬ 
visable to re-seed the lawn after tne last spravmg, using a garden 
rake or other tool to loosen up the surface of the soil so that the 
seed may germinate well. 
Fig. 12 . 
A suitable outfit for spraying a small 
lawn. 
Iron sulphate solutions will stain light-colored objects a rusty 
color and for this reason it should be applied carefully along 
sidewalks, curbings and foundation walls. It is desirable where 
extensive work is being done to protect such surfaces with boards, 
old canvas, or other covering during the application of the spray. 
The iron sulphate is not poisonous and no fears need be enter¬ 
tained in handling it. with the exception of its tendency to dis- 
