204 PERENNIAL CROPS 



readily accomplished by covering the crowns with coarse litter, 

 sand or loose soil, or by inverting a deep flower pot over each 

 plant, care being taken to close the drainage hole to exclude all 

 light. Under these conditions, the leaf stalks grow from six to 

 ten inches long, including the midrib, which is also used. 



QUESTIONS 



1. "WTiich is the most important of the perennial crops? 



2. What are some of the attractive features of asparagus culture? 



3. How does asparagus behave under extremes of temperature? 



4. How is an asparagus plantation started? 



5. At what age should asparagus roots be planted? 



6. Describe the method of growing asparagus roots from seed. 



7. At what time of the year should asparagus roots be planted? 



8. Describe the fitting of land for planting asparagus roots. 



9. How deep should asparagus roots be planted? 



10. Describe the tillage of an asparagus plantation the first season. 



11. Describe the late fall and early spring treatment of a young asparagus 



plantation. 



12. How soon after planting can a crop of asparagus safely be cut? Wliat 



restrictions must be placed upon cutting from a young plantation? 



13. Describe the regular tillage for one season in an established asparagus 



plantation. 



14. How often should manure be applied to an asparagus plantation? 



15. How long each season is it safe to cut an asparagus plantation? 



16. WTiat are the indications that an asparagus plantation is being cut too 



late? 



17. Describe the production of blanched asparagus. 



18. What part of the rhubarb plant is edible? 



19. When is the rhubarb crop harvested? How long does the harvest continue . 



20. What extremes of temperature will rhubarb endure? 



21. How is rhubarb propagated? 



22. Describe the planting of rhubarb roots. 



23. Describe the tillage and fertilizing of a rhubarb plantation. 



24. Contrast the harvesting of rhubarb and asparagus. 



25. WTiy and when should the seed stalks be removed from rhubarb? 



26. Whsit treatment is advised for an old rhubarb plantation? 



27. WTiat is the easiest way to get started in the culture of globe artichokes? 



28. WTiat part of the globe artichoke plant is the edible product? 



29. WTiat winter protection must be given globe artichokes? 



30. After a person has an artichoke plantation, how may it be extended or 



renewed? 



31. How long wall a globe artichoke plantation continue to produce good 



crops? 



32. How do Jerusalem artichokes differ from globe artichokes? 



33. What part of sea-kale is the edible portion? 



34. What advantage has sea-kale over the perennial crops already considered? 



35. In what ways may sea-kale be propagated? 



36. How may sea-kale be blanched? 



