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Rahmlow, H. J. (ed.) / Wisconsin horticulture
Vol. XXX (September 1939/July-August 1940)

Wisconsin horticulture, vol. 30, no. 9: May, 1940,   pp. [241]-272


Page 265

 
WISCONSIN  HORTICULTURE 
SPRINKLING PLANTS IN 
                 SUNSHINE 
W E have all been told that 
     sprinkling the grass or the 
 garden plants when the sun was 
 shining caused burning of the 
 leaves. It was assumed that the 
 water became so hot that burn- 
 ing occurred, or that the drop of 
 water served as a lens and fo- 
 cused the light to one point burn- 
 ing the leaf. Recently, scientists 
 took the temperature of the por- 
 tion of the leaf under such drops 
 of water and found it was always 
 lower than that of other parts 
 of the leaf not covered. Such sup- 
 posed burning has not been found 
 possible. Most injury of plant 
 leaves at higher temperature oc- 
 curs because of lack of water in 
 the tissues, causing drying rather 
 than actual burning of the leaf 
 becatse of the high temperature. 
 Roots Grow Best in Warm Soil 
 Roots of plants grow better in 
 warm soil than in cold soil. Some 
 gardeners are of the opinion that 
 bulbous plants produce a better 
 root system when the soil is just 
 above freezing than if it is at 60' 
 or 70'. They often go so far as 
 to place bulbous plants at the low 
 temperature for root growth. Ex- 
 periments show that root growth 
 of these plants is far better at the 
 higher temperatures. Low tem- 
 peratures may have some other 
 effect than the stimulation of root 
 growth. 
 The absorption of minerals and 
 water from soil is closely related 
 to temperature. Gardenias and 
 Roses have been found to become 
 light green between the veins of 
 the leaves in cold soil, because 
 the roots are unable to obtain 
 iron. Warming the soil has over- 
come the trouble. During the past 
summer, the writer observed that 
some Chrysanthemums, placed at 
50' at night, wilted each morning 
when they were placed in the 
greenhouse at a temperature of 
75'. Plants will often wilt in the 
greenhouse the morning after a 
cool night, if the temperature of 
the air rises rapidly and the soil 
is cold. The wilting, in these 
cases, is due to the roots' inabil- 
ity to absorb water at low tem- 
peratures. Cold water applied to 
soil has been observed to produce 
a similar effect. 
-By Kenneth Post, Cornell Uni- 
versity, in Gardeners' Chronicle. 
  PLANTS WINTERED WELL 
  Perennials Kept Dry and Warm 
  Will Survive Our Winters 
M OST gardeners report a very 
      satisfactory, winter from 
 the standpoint of wintering per- 
 ennials and plants-even those 
 considered senmi-hardy. In our 
 garden we lost practically noth- 
 ing this year. The reason is that 
 the soil and the mulch were dry 
 all winter long. In other words, 
 the plants were kept dry and 
 warm. 
 Last fall the weather was mild. 
 Finally snow came and imme- 
 diately after some very cold 
 weather. However, the snow pro- 
 tected the plants. The snow did 
 not thaw and consequently it re- 
 mained dry and full of (lead air 
 spaces which is very much like 
 a blanket, keeping the plants 
 warm. 
 It looks as if the secret to our 
 wintering problem lies in two 
 things: first, keep the plants dry 
 and second, keep them   warm 
 with a mulch. The mulch rniust 
 also be dry. 
 We are of the opinion that 
 many plants which we have con- 
 sidered semi-hardy here in Wis- 
 consin can be wintered success- 
 fully if we develop a method of 
protecting them which will keep 
them dry and warm. 
   THE CHICAGO FLOWER 
            SHOW 
HE Chicago Flower Show at 
   the Navy Pier this year fea- 
tured the home garden of the 
average American home. There 
were 27 small gardens of various 
types around such homes as may 
be seen in the suburb of any city. 
  The   Morton   Arboretum 
brought in a century of~d barn 
and corn crib to illustrate what 
can be done in beautifying farm 
grounds. Red pine was used in 
back of the barn with a planting 
of dogwood around the barn. 
  A beautifully done herb garden 
emphasized the decorative value 
of grapes, gooseberries, currants 
and other small fruits, as well as 
that of herbs. Herbs were also 
used in a home entrance garden 
which had a charming dwarf clip- 
ped hedge and two copiary en- 
trance features of Germander 
(Teucritim). 
  The show was again under the 
in a n a g e in e n t of Mrs. 0. W. 
Dynes, former president of the 
National Council. 
HARDY PLANTS FOR 
  WISCONSIN GARDENS 
  The Newer and Improved 
  Varieties as well as the 
       Standard Kinds 
     Complete line of 
     Nursery Stock 
     Trees, Shrubs, Roses, 
  Evergreens and Perennials 
       in all varieties 
 Fruit Trees and Small Fruits 
    WRITE FOR LISTS 
    RASMUSSEN'S 
    Fruit Farm & Nurseries 
  OSHKOSH, WISCONSIN 
May, 1940 
265 


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