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