88 PLANT PROPAGATION 



the soft-wood cuttings are propagated about two-thirds of 

 the leaf surface is removed in order to reduce the transpira- 

 tion. It requires from three to six weeks for the cuttings 

 to strike root and with some plants even a longer time is 

 necessary. Gentle bottom heat is valuable in assisting or 

 stimulating the cuttings to form roots. As soon as roots 

 have been formed, the cuttings are potted in small thumb 

 pots and shifted to larger sizes as the plants grow. 



REVIEW QUESTIONS. 



1. What two kinds of reproduction occur in plants? 



2. What is sexual reproduction; vegetative reproduction? 



3. How does sexual reproduction differ from vegetative reproduction? 



4. Name ten kinds of vegetative reproduction. 



5. What is a bulb? 



6. How are bulbs propagated? 



7. How does a corm differ from a bulb? 



8. What is a rhizome; a tuber? 



9. Differentiate between a rhizome and a procumbent stem. 



10. W T hat is the difference between a runner, a stolon and a layer? 



11. What kind of plants are usually propagated by stolons and by layers? 



12. What is tip layering and give an example? 



13. Distinguish between a tuber cutting and a root cutting. 



14. Differentiate between a stem cutting and a leaf cutting. 



15. Discuss the storing of hard-wood cuttings. 



16. How do semihard-wood cuttings differ from soft-wood and hard- 

 wood cuttings? 



17. Why must soft-wood cuttings be handled differently from hard- 

 wood cuttings? 



18. Discuss the planting of soft-wood cuttings. 



