HOW PLANTS ARE PROPAGATED 



353 



Many garden plants are propagated by both roots and 

 seeds. The seed of onions is often sown so thick that only 

 small onions grow the first season. These small onions 

 are called onion sets, and 

 are kept over the winter 

 and planted the next season 

 to produce big onions, Cab- 

 bages and turnips store food 

 the first year in the head 

 and roots respectively, and 

 will grow seed the second 

 year if replanted. 



Many wild plants repro- SHOWING PROPAGATION OF WHITE 

 . CLOVER BY RUNNING STEM 



duce by seeds and roots also. 



Nearly all of the early spring flowers have rootstocks and 

 bulbs in which food is stored for early growth. The May 



apple spreads by growing under- 

 ground a root which has a bud 

 on the end to make a plant 

 above ground the next season. 

 Many grasses reproduce by 

 sending out stem-like root- 

 stocks just beneath the surface 

 of the soil. Blue grass is an 

 example. 



242. By Use of Cuttings. 

 The white or Irish potato is a 

 tuber and an enlarged under- 



GRAPE CUTTING AND THE SAME groun d stem. The eyes are buds 

 AFTER ONE YEAR'S GROWTH . 



which will grow when conditions 



are favorable. For planting, the potatoes are cut into 

 pieces with two or more eyes on each piece. One or 

 two of these eyes may grow and produce potato stalks 



