Plants as Affected by Excessive Light. 



141 



taining cuttings or tender seedlings, as of many cone- 

 bearing trees. Cuttings in the nursery may be shaded 



by supporting a board 

 over the row, on short 

 stakes (Fig. 64), so as to 

 protect them during the 

 warmer hours of the day. 



Fig. 62. Shed screen built of three-inch- Shingles, flower-pots Or 



wide slats, for shading tender plants and i n j? 



for storing pots and boxes of slow-germl- J^^^'g© grCCU ICaveS, aS 01 



natlng seeds. (After Bailey). the burdock, are USeful 



for shading plants of the cabbage, tomato etc. 



Fig. 63. Brush screen, for shading tender plants In the open ground. 

 (After Bailey). 



In culture under glass, the glass is often thinly washed 

 with lime or clay to render it partially opaque, or lath 

 screens are used either above or below the glass. On 



Fig. 6t. Board shade for recently-set plants, or for cuttings not yet rooted. 



greenhouse benches, sheets of thin paper or light cloth 

 screens are useful for shading cuttings, recently-planted 

 seedlings and germinating seeds. 



Shading should never be so put on as to prevent a free 

 circulation of air about the plants. 



