18 PLANT PROPAGATION 
When it is only necessary to procure a limited number, 
pots filled with suitable soil may be placed for them to 
root into, securing them in position with a stone or a peg 
until the roots have penetrated the soil, and keeping any 
further growing-points pinched out to throw all the 
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SAXIFRAGA SARMENTOSA TRICOLOR, SHOWING RUNNERS. 
nourishment supplied by the parent plant into the young 
runner; this, when well rooted and fully established, 
may be severed from the old plant to supply its own 
nourishment and to support itself as a separate indi- 
vidual, which will soon result if the soil in the pots be 
kept constantly moist. 
