Suggestions for Laboratory and Field Work to Precede 

 Chapter Seventeen 



1. Review and as far as possible illustrate with specimens the 

 various methods of propagating plants vegetatively. Here may 

 be included : 



a. Bulbs, tubers, corms, and rootstocks. 



b. Cuttings, as in the geranium and grape. 



c. Runners and horizontal stems, as in strawberry and blue 



grass. 



d. Leaf cuttings, as in Begonia and Bryophyllum. 



e. Small lateral branches (suckers), as in carnation, pine- 



apple, and banana. 



2. Make a field trip to a commercial greenhouse or nursery to 

 see how plants are propagated. 



3. Report on the origins of some of the common garden vege- 

 tables and field crops. Information may be obtained in encyclo- 

 pedias and in agricultural and horticultural textbooks. 



4. Study a few weeds in the field, trying in each case to deter- 

 mine why the plant is successful in growing where it is not wanted. 

 List the weeds, and put the results of your study in the form of a 

 table : 



Name of Weed 



Propagated by 



Reproduced by 



Seeds Carried by 



Why Difficult 

 TO Exterminate 



5. What are the five commonest weeds of lawns? of cornfields? 

 of pastures? of gardens? Why do difi^erent kinds of weeds occur 

 in these several habitats ? 



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