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How to Grow Radicchios
Contributed by: Swan
  • 1. What type of plant is radicchio?
A) Fruit
B) Root vegetable
C) Grain
D) Leafy vegetable
  • 2. What is the ideal soil pH for growing radicchio?
A) 8.5-9.0
B) 7.5-8.0
C) 6.0-6.8
D) 5.0-5.5
  • 3. When is the best time to plant radicchio for a fall harvest?
A) Late winter
B) Late summer
C) Mid-summer
D) Early spring
  • 4. Which of these is a common radicchio variety?
A) Valencia
B) Russet
C) Chioggia
D) Gala
  • 5. What is the recommended spacing between radicchio plants?
A) 2-4 inches
B) 18-24 inches
C) 36-48 inches
D) 8-12 inches
  • 6. Radicchio is known for its:
A) Salty flavor
B) Sour flavor
C) Sweet flavor
D) Bitter flavor
  • 7. Which of the following helps reduce radicchio's bitterness?
A) Exposure to frost
B) Adding lime to the soil
C) Exposure to full sun
D) Frequent watering
  • 8. What type of fertilizer is generally recommended for radicchio?
A) High-potassium fertilizer
B) Balanced fertilizer
C) High-phosphorus fertilizer
D) High-nitrogen fertilizer
  • 9. What is the most common pest that affects radicchio?
A) Tomato hornworms
B) Potato beetles
C) Squash bugs
D) Aphids
  • 10. How often should radicchio be watered?
A) Daily
B) Regularly, maintaining moist soil
C) Only when the soil is completely dry
D) Once a week
  • 11. What part of the radicchio plant is typically harvested?
A) The roots
B) The head
C) The flowers
D) The seeds
  • 12. How should harvested radicchio be stored?
A) In a dry pantry
B) At room temperature
C) In the refrigerator
D) In the freezer
  • 13. What does 'forcing' radicchio refer to?
A) Using physical barriers to shape the head
B) Growing it in extremely hot temperatures
C) Growing it in darkness to reduce bitterness
D) Applying heavy fertilizer
  • 14. Which nutrient is most important for leafy growth in radicchio?
A) Potassium
B) Nitrogen
C) Calcium
D) Phosphorus
  • 15. What is the ideal temperature range for radicchio growth?
A) 100-110°F
B) 60-70°F
C) 80-90°F
D) 30-40°F
  • 16. Radicchio is a good source of which vitamin?
A) Vitamin D
B) Vitamin K
C) Vitamin C
D) Vitamin A
  • 17. What does bolting refer to in radicchio?
A) Premature flowering
B) Head splitting
C) Root rot
D) Leaf discoloration
  • 18. How can bolting be prevented in radicchio?
A) Planting in full shade
B) Applying excessive fertilizer
C) Planting at the right time of year
D) Over-watering
  • 19. What is 'variegation' in radicchio?
A) Deformed leaves
B) Leaves with insect damage
C) Different colored patterns on the leaves
D) Leaves covered in mildew
  • 20. Which type of soil is best for growing radicchio?
A) Sandy soil
B) Soil with high acidity
C) Heavy clay soil
D) Well-drained soil
  • 21. What is a common disease that affects radicchio?
A) Bacterial wilt
B) Fusarium wilt
C) Downy mildew
D) Anthracnose
  • 22. How can downy mildew be prevented in radicchio?
A) Good air circulation
B) Applying excess nitrogen fertilizer
C) Planting in dense shade
D) Overwatering
  • 23. What is the role of blanching in radicchio cultivation?
A) To protect from frost
B) To reduce bitterness
C) To promote faster growth
D) To increase chlorophyll production
  • 24. Which companion plant is beneficial for radicchio?
A) Cabbage
B) Carrots
C) Fennel
D) Potatoes
  • 25. What is the ideal harvest stage for radicchio?
A) When the head is small and loose
B) When the leaves are wilted
C) When the plant is flowering
D) When the head is firm and well-formed
  • 26. What does 'heading' refer to in radicchio?
A) The process of planting seeds
B) The process of removing weeds
C) The process of watering the plants
D) The formation of a compact head of leaves
  • 27. How can weeds be controlled around radicchio plants?
A) Applying excess fertilizer
B) Planting too close together
C) Mulching
D) Overwatering
  • 28. What is the benefit of growing radicchio in a raised bed?
A) Reduced sunlight
B) Increased pest problems
C) Improved drainage
D) Slower growth
  • 29. What is the best method for irrigating radicchio?
A) Overhead watering
B) Not watering at all
C) Drip irrigation
D) Flood irrigation
  • 30. What is the purpose of hardening off radicchio seedlings before transplanting?
A) To acclimatize them to outdoor conditions
B) To prevent pest infestations
C) To encourage rapid growth
D) To increase their size
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