Oxalis Triangularis Trivia Questions and Answers

1: What is the common name for Oxalis triangularis?
A: False Shamrock
B: Cloverleaf
C: Purple Clover
D: Woodland Sorrel
Correct Answer: A
Explanation: Oxalis triangularis is commonly called “false shamrock” due to its trifoliate leaves, which resemble those of true shamrocks.

2: Which climate zones are best for growing Oxalis triangularis outdoors?
A: USDA zones 2a-5b
B: USDA zones 6a-9b
C: USDA zones 8a-11
D: USDA zones 10a-13
Correct Answer: C
Explanation: Oxalis triangularis can be grown outside in USDA climate zones 8a-11, where the temperatures are more conducive for its growth.

3: How do the leaves of Oxalis triangularis behave at night or under harsh sunlight?
A: Remain spread and still
B: Fold down
C: Change color
D: Detach and fall
Correct Answer: B
Explanation: The leaves of Oxalis triangularis fold down at night, when disturbed, and in harsh sunlight, showing an adaptive movement.

4: Which part of the Oxalis triangularis is responsible for its movement in response to light levels?
A: Petals
B: Central vein
C: Petiole base cells
D: Root system
Correct Answer: C
Explanation: The movement is powered by changes in turgor pressure in cells at the base of the leaf, which allows the leaflets to fold at the level of the central vein.

5: What type of award has the subspecies Oxalis triangularis subsp. papilionacea received from the Royal Horticultural Society?
A: Award of Floral Excellence
B: Plant of the Year
C: Award of Garden Merit
D: Gold Medal in Horticulture
Correct Answer: C
Explanation: The subspecies Oxalis triangularis subsp. papilionacea has won the Royal Horticultural Society’s Award of Garden Merit.

6: What is the origin of Oxalis triangularis?
A: North America
B: Southern South America
C: East Asia
D: Western Europe
Correct Answer: B
Explanation: Oxalis triangularis is native to several countries in southern South America.

7: What color are the flowers of Oxalis triangularis?
A: Red
B: Blue
C: White or pale pink
D: Yellow
Correct Answer: C
Explanation: The flowers of Oxalis triangularis are typically white or pale pink.

8: How long are the five white petals of Oxalis triangularis flowers?
A: About 1 inch
B: About 2 inches
C: About 3 inches
D: About 4 inches
Correct Answer: B
Explanation: The petals of Oxalis triangularis flowers are about 2 inches long.

9: What causes the movement of Oxalis triangularis leaves if it is not due to growth?
A: Changes in mineral content
B: Changes in turgor pressure
C: Enzyme activity
D: Genetic mutation
Correct Answer: B
Explanation: The movement is due to changes in turgor pressure, not growth, making it an example of photonasty.

10: In which US states is Oxalis triangularis considered a neophyte?
A: California and Texas
B: New York and Illinois
C: Florida and Louisiana
D: Washington and Oregon
Correct Answer: C
Explanation: Oxalis triangularis is considered a neophyte in Florida and Louisiana.

11: What should be the minimum winter temperature for Oxalis triangularis to thrive?
A: 10 °C (50 °F)
B: 5 °C (41 °F)
C: 0 °C (32 °F)
D: -5 °C (23 °F)
Correct Answer: B
Explanation: The purpleleaf false shamrock, a subspecies of Oxalis triangularis, is hardy down to -5 °C (23 °F).

12: What kind of soil is most suitable for growing Oxalis triangularis?
A: Clay soil with poor drainage
B: Sand-based soil
C: Average potting soil with good drainage
D: Rocky terrain
Correct Answer: C
Explanation: Oxalis triangularis thrives in average potting soil with good drainage.

13: What is the scientific term for the movement of Oxalis triangularis leaves in response to light levels?
A: Phototropism
B: Photonasty
C: Photodasticity
D: Phototaxis
Correct Answer: B
Explanation: The movement in response to light levels is known as photonasty.

14: What should be done to mature Oxalis triangularis plants every 3-5 years?
A: Transplanted to a new location
B: Cut back to the soil
C: Given extra fertilizer
D: Divided and repotted
Correct Answer: B
Explanation: Mature plants should be cut back to the soil every 3-5 years.

15: How often should young Oxalis triangularis plants be cut back to the soil?
A: Every month
B: Every summer
C: Every year
D: Only when insect-infested
Correct Answer: C
Explanation: Young plants should be cut back to the soil every year until they reach maturity.

16: What is the main difficulty in caring for frost-resistant Oxalis species?
A: Growing uncontrollably
B: Attracting pests
C: Nutrient deficiency
D: Excessive water needs
Correct Answer: A
Explanation: The main challenge is preventing frost-resistant Oxalis species from growing uncontrollably.

17: What happens when Oxalis triangularis fruits ripen?
A: Leaves turn yellow
B: Seeds are ejected
C: Flowers dry up
D: Tuberous rhizome forms
Correct Answer: B
Explanation: The ripe fruit will crack and throw away seeds over a considerable distance.

18: What kind of lighting is best for growing Oxalis triangularis indoors?
A: Direct sunlight
B: Bright indirect sunlight
C: Low shade
D: Complete darkness
Correct Answer: B
Explanation: Oxalis triangularis requires bright indirect sunlight when grown indoors.

19: How should Oxalis triangularis be watered during the winter months?
A: Frequently
B: Moderately
C: Sparingly – only when the topsoil looks dry
D: Not at all
Correct Answer: D
Explanation: In winter, they should not be watered.

20: What fertilizing strategy is recommended for Oxalis triangularis after flowering?
A: Frequent nitrogen supply
B: Multi-component fertiliser
C: No fertilizer
D: High potassium specific fertilizer
Correct Answer: B
Explanation: After flowering, Oxalis triangularis should be fertilized with an appropriate multi-component fertilizer.

21: What taste do Oxalis triangularis leaves have due to their oxalic acid content?
A: Sweet
B: Bitter
C: Acidic
D: Salty
Correct Answer: C
Explanation: The leaves have an acidic taste due to their oxalic acid content.

22: What can happen if large amounts of Oxalis triangularis leaves are consumed?
A: None; they are safe in all amounts
B: Nutritional benefit
C: Discomfort due to oxalic acid
D: Instant illness
Correct Answer: C
Explanation: Consuming large amounts of leaves can cause discomfort due to the oxalic acid content.

23: What part of Oxalis triangularis is eaten and described as having a sweet taste?
A: Leaves
B: Flowers
C: Rhizomes
D: Petioles
Correct Answer: C
Explanation: The rhizomes are eaten raw or cooked and have a sweet taste.

24: How does Oxalis triangularis primarily propagate?
A: Air layering
B: Division of corms
C: Seed dispersal
D: Stem cuttings
Correct Answer: B
Explanation: Oxalis triangularis propagates by division of corms.

25: What triggers the leaf movement in Oxalis triangularis?
A: Sound waves
B: Water levels in the soil
C: Light levels
D: Soil temperature
Correct Answer: C
Explanation: The leaf movement in Oxalis triangularis is triggered by changes in light levels.

26: What type of root system does Oxalis triangularis have?
A: Tuberous rhizome
B: Fibrous roots
C: Taproot system
D: Aerial roots
Correct Answer: A
Explanation: Oxalis triangularis is formed by leaves borne by a long petiole emerging from a tuberous rhizome.

27: What should be avoided when planting Oxalis triangularis close to vegetable beds?
A: Overwatering
B: High humidity
C: Close proximity due to seed dispersal
D: High soil acidity
Correct Answer: C
Explanation: The ripe fruit can throw away seeds over a considerable distance, which can invade nearby vegetable beds.

28: Apart from nitrogen, what do Oxalis triangularis plants mostly need to help with flowering?
A: Sulfur and Calcium
B: Phosphorus, Potassium, and trace elements
C: Iron and Magnesium
D: Zinc and Boron
Correct Answer: B
Explanation: Phosphorus, Potassium, and easily absorbed trace elements help them flower long and beautifully.

29: How frequently should Oxalis triangularis be fed with fertilizer during the growing period?
A: Once every two months
B: Regularly during the flowering period
C: Only before flowering
D: No need for fertilizer
Correct Answer: B
Explanation: It’s worth feeding Oxalis triangularis with a small dose of a multi-component fertilizer during the flowering period.

30: What award has the subspecies Oxalis triangularis subsp papilionacea received?
A: The Horticultural Society Excellence Award
B: The Royal Horticultural Society’s Award of Garden Merit
C: The International Plant Award
D: The Botanical Garden Award
Correct Answer: B
Explanation: It has received the Royal Horticultural Society’s Award of Garden Merit.

31: How are Oxalis triangularis seeds dispersed?
A: Wind
B: Water
C: Explosive dehiscence
D: Animal consumption
Correct Answer: C
Explanation: Once ripe, Oxalis triangularis fruit can crack and throw seeds over a considerable distance through explosive dehiscence.

32: What other common plants have leaves that fold at night similar to Oxalis triangularis?
A: Marigolds
B: Fiddle leaf figs
C: True clovers
D: Spider plants
Correct Answer: C
Explanation: True clovers also have leaves that fold at night.

33: How is the petiole of Oxalis triangularis described?
A: Hard and dark brown
B: Soft and whitish
C: Rough and green
D: Thin and yellow
Correct Answer: B
Explanation: The petiole of Oxalis triangularis is described as soft and whitish.

34: What is the flower color of wild species of Oxalis triangularis limb?
A: Green
B: Purple
C: Orange
D: Yellow
Correct Answer: A
Explanation: The limb of the wild species is green, but purple cultivars have been selected for horticulture.

35: How long is the petiole of Oxalis triangularis?
A: 5 to 10 cm
B: 10 to 15 cm
C: 15 to 25 cm
D: 25 to 35 cm
Correct Answer: C
Explanation: The petiole of Oxalis triangularis is 15 to 25 cm long.

36: During what seasons does Oxalis triangularis usually flower?
A: Winter to spring
B: Spring to autumn
C: Summer to winter
D: Autumn to winter
Correct Answer: B
Explanation: Flowering takes place from spring to autumn.

37: What is the specific name for the horizontal stem from which Oxalis triangularis grows?
A: Tuberous rhizome
B: Adventitious root
C: Aerial stem
D: Corm root
Correct Answer: A
Explanation: Oxalis triangularis grows from a tuberous rhizome.

38: Which propagation method is used at the end of Oxalis triangularis dormancy period?
A: Leaf cuttings
B: Seed starting
C: Corm division
D: Tissue culture
Correct Answer: C
Explanation: At the end of each dormancy period, the corms can be unearthed, offsets cut, and replanted in appropriate soil.

39: Which award-winning characteristic does the subspecies Oxalis triangularis subsp papilionacea possess?
A: Evergreen foliage
B: Hardy in mild regions
C: Resistance to drought
D: Flowering frequency
Correct Answer: B
Explanation: This subspecies is hardy in mild and coastal areas.

40: What visual feature occurs in Oxalis triangularis under low light conditions?
A: Leaves spread wider
B: Flowers open fully
C: Leaves fold
D: Flowers change color
Correct Answer: C
Explanation: Leaves fold under low light conditions.

41: Where is Oxalis triangularis widely found outside of its native region in South America?
A: North America
B: East India
C: Europe
D: Australia
Correct Answer: B
Explanation: It is widely found in East India, especially in Nagaland and Manipur.

42: How are the flowers described in terms of the arrangement on Oxalis triangularis?
A: They are solitary.
B: They grow in clusters.
C: They appear as spikes.
D: They form in umbels.
Correct Answer: B
Explanation: The five-petalled flowers appear in clusters.

43: What is one of the physical characteristics of the leaves of Oxalis triangularis?
A: They are densely haired.
B: They are smooth (glabrous).
C: They are rugose.
D: They are thorny.
Correct Answer: B
Explanation: The leaves are glabrous (smooth).

44: What should be avoided in the souling period of Oxalis triangularis?
A: Sunlight exposure
B: Temperature drops
C: Using excess water
D: Providing extra fertilizer
Correct Answer: C
Explanation: Overwatering should be avoided during the dormant period.

45: How long are the sepals of Oxalis triangularis flowers?
A: 1 to 1.5 mm
B: 2 to 3 mm
C: 5 to 5.5 mm
D: 7 to 7.5 mm
Correct Answer: C
Explanation: The sepals are 5 to 5.5 mm long.

46: How often should you water Oxalis triangularis when it’s actively growing?
A: Only when the topsoil looks dry
B: Every day
C: Every week
D: Once a month
Correct Answer: A
Explanation: They should be watered only when the topsoil looks dry.

47: What should be avoided in higher indoor temperatures for Oxalis triangularis?
A: Direct sunlight
B: Overfertilizing
C: Prolonged warmth above 27 °C (81 °F)
D: Using sweet soil
Correct Answer: C
Explanation: It will go into dormancy prematurely or take on a “tired” appearance if temperatures exceed 27 °C (81 °F) for prolonged periods of time.

48: What temperature is suitable for Oxalis triangularis to prevent uncontrolled growth?
A: Below 5 °C (41 °F)
B: Below 15 °C (59 °F)
C: Around 25 °C (77 °F)
D: Above 30 °C (86 °F)
Correct Answer: B
Explanation: Bright indirect sunlight and a cool indoor temperature of 15 °C (59 °F) prevent uncontrolled growth.

49: What is the most common use of Oxalis triangularis leaves and flowers in culinary?
A: Ingredient in soups
B: Decoration for salads
C: Base for smoothies
D: Baked in pastries
Correct Answer: B
Explanation: The leaves and flowers are often used as a decoration for salads.

50: What happens to the seed of Oxalis triangularis after the fruit ripens?
A: It rots quickly.
B: It floats away.
C: It is forcefully ejected.
D: It remains attached to the plant.
Correct Answer: C
Explanation: The ripe fruit will crack and throw away seeds over a considerable distance.

51: What is the binomial name of Oxalis triangularis?
A: Oxalis regnellii
B: Trifolium repens
C: Oxalis triangularis
D: Sorrel oxalidales
Correct Answer: C
Explanation: The binomial name is Oxalis triangularis.

52: What is the height of Oxalis triangularis plants?
A: 30 cm (12 in)
B: 40 cm (16 in)
C: 50 cm (20 in)
D: 60 cm (24 in)
Correct Answer: C
Explanation: Oxalis triangularis can grow up to 50 cm (20 in) tall.

53: Which Oxalis triangularis subspecies is recognized for its distinctive purple leaves?
A: regnellii
B: microphylla
C: papilionacea
D: stricta
Correct Answer: C
Explanation: The subspecies Oxalis triangularis subsp. papilionacea is known for its purple leaves.

54: How is the ornamental subspecies of the plant described in terms of leaf shape?
A: Obcordate
B: Oblanceolate
C: Obtriangular to obovate-triangular
D: Oval
Correct Answer: C
Explanation: The ornamental shape subspecies has leaves that are obtriangular to obovate-triangular.

55: What is a key indicator to stop watering Oxalis triangularis?
A: When leaves curl
B: When the topsoil is still moist
C: When the soil is waterlogged
D: During the winter period
Correct Answer: D
Explanation: They should not be watered during the winter months.

56: What characteristic do the stamens and style of Oxalis triangularis share?
A: They are smooth.
B: They are densely hairy.
C: They are thorny.
D: They are winged.
Correct Answer: B
Explanation: The stamens and the style are densely hairy.

57: What is the flowering season length for Oxalis triangularis?
A: All year round
B: Spring to autumn
C: Summer to winter
D: Autumn to spring
Correct Answer: B
Explanation: Flowering occurs from spring to autumn, encompassing the majority of the growth season.

58: What characteristic should be regularly checked while propagating Oxalis triangularis?
A: Soil pH level
B: Light intensity
C: Presence of offsets in corms
D: Humidity levels
Correct Answer: C
Explanation: During regular dormancy periods, check corms for offsets to propagate new plants.

59: What feeding strategy ensures long and beautiful flowering of Oxalis triangularis?
A: Continuous nitrogen supply
B: Several doses of phosphorus
C: Small doses of multi-component fertiliser
D: Discontinued feeding
Correct Answer: C
Explanation: Small doses of multi-component fertiliser during the flowering period promote long, beautiful blooms.

60: Which method does not suit Oxalis triangularis propagation?
A: Corm division
B: Seed distribution
C: Stem cuttings
D: Root transplantation
Correct Answer: C
Explanation: Oxalis triangularis propagates mainly through corm division and not through stem cuttings.

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