PROPAGATION BY MEANS OF SEEDS AND SPORES 23 



Horticulturists are well aware that seeds of parsnip and 

 certain others of the Umbelliferse are unreliable after one or 

 two years, whereas cucumber and others of the Cucurbitacea? 

 may be "good" after several or even many years. They 

 reduce the risk to the minimum, however, by insisting on 

 "fresh" seeds, that is, on those grown the preceding year. 



Keeping the seeds 



To keep seeds is to prevent germination and at the same 

 time to preserve the life of the seed. 



